I want to come over and give the Grown Ups a serious listen...

Updated Oct 19, 2023 7:22:07am

We're taking a break for the next 5 weeks trying to focus away from chips, 0805, 0603, SOP8, SOT23, clingon's and starbasses visiting wonderfull Thailand to meet my oldest son parents in law, travel at least 2000 mile, sample local cuisine, attend a marriage and see temples while thinking it's way too hot in here and will be back for business from 15 august onwards. Happy Holidays to you all !

With the 2020 TPA3255 based BMH3D module prototype thermal problems fixed work started on the 2023 version and am happy to announce that after extensive testing including late night listening sessions the first 2023 version is here and altough still in it's prototype phase did receive some notable improvements over the 2020 design among which are the increased VDD buffercapacity and the usage of larger reconstruction filter inductors.

A batch of five has been ordered which will be tested mid august after our holiday break.

https://piratelogic.nl/?p=en.blog

With the last tpa3255 based BMH3D proto nearing completion work has started on a production version. Front-panel form factor is with 100 x 100 mm similar to the current 3116 based version as currently being used in the Grown/Up enclosure however it's depth is 50 mm (3116 version : 30 mm) due to the use of larger capacitors and output coils.

- 20dB motional feedback loop supporting both StarBass as ClingOn accelerometers.
- The 3255 is set into 2.1 mixed mode with 1x BTL bass and 2x SE mide/high channels.
- RMS power output 155W @ 8ohm, 255W @ 4ohms woofer channel, 35W @ 8ohm, 77W @ 4ohm mid and high channel.
- External single 51V powersupply via XT30 connector.
- Fixed analog sallenkey based 2nd order LR low/mid xover at 400hz, 4th order LR mid/high xover at 4Khz.
- Symmetric mini XLR input and thru, maximum sensitivity -6dBu 330mV adjustable from the back.
3 individual class D channels, 2x amplification
- 2.4 watt standby power consumption, automatic power on/off.
- connection to drivers via 8pole microFIT connector, optional status led via 2 pole 2.54mm JST.

To keep up to date visit our blog.

Updated Jun 02, 2023 12:08:33pm

The electronics for the Grown/Up successor prototype is taking shape 😎

Tested the 2020 version of the tpa3255 based Grown/Up BMH3D amplifier module with the newly developed cooling solution. Caps, coils and heat sink remain well under 40 C with Vd 48V and rated power @ 8 ohms. Looking forward pairing it with the upcoming 12" and 15" equipped 3 way systems 😎

Did a tpa3255 version of my BMH3D Grown/Up 3 way module back in 2020 which got halted due to thermal issues, the tpa3116 cooling solution clearly didn't suffice for the 3255 hothead. Luckily I've found someone in my network with experience milling 6 mm aluminium so we're back in business

Can't wait to start building this 3 way design 😎

Doing some research into "acoustic radiation impedance", see https://testhifi.com/2019/02/11/acoustic-radiation-impedance/ for more details, in relation to my plans for a prosound servo system. Next to the obvious choice for larger drivers I'm also looking into pairing smaller drivers in parallel using some vintage drivers I have laying around. Good old Philips, miss you 🥹

Next to building the next batch of 20 Grown/Up's I've been working on this, my first SAOB (servo assisted open baffle) prototype, sporting a magnetostatic mid/high unit build by Joppe Peelen paired with two impuls compensated little/one servo woofers.

The prototype measures H44, W22 and D20 cm, is powered by the same Piratelogic BMH3D 3 way module as being used with my Grown/Up enclosures. Xovers sit at a 2nd order @ 400hz and 4rd order @ 4Khz. First listening tests reveal a true open baffle character but without the dimensions that normally accompany a f3 of 40hz.

Got some mail the other day, although I love the fact that there is an ever increasing number of people starting attempts at building servo enclosures I do feel there's a need for bit of warning here:

"Hi there, I've managed to gather some nice drivers to make some speakers and the idea of implementing your servo circuit / accelerometer in a project is always lingering in the back of my head. The one I first want to start with is a mid size three way with Accuton drivers."

Designing & building servo drive systems requires a thorough understanding of and working experience with the underlying electronics. An engineering degree and experience with component level board repair is strongly advised.

Hence my advise not to start your servo journey with expensive drivers but use some budget drivers to experiment on first !!!!!!!!!!!!!!!

https://piratelogic.nl/data/docs/products/eve/piratelogic.eve.2020.0.manual.en.pdf

Testing a budget LED power supply with a pair of BMH3D equipped Grown/Up enclosures with my newly acquired Pico Technology 2205A scope. The 24V dc noise figure remains well below 40mV in both standby as well as operating mode. Turning up the volume with the new bass worthy Skrillex tunes rises the Grown/Up current consumption to ~8A @ 24V and increases the supply ripple to 38mV. -60dB switching suppression at 75Khz.

Interesting driver, wondering what it looks like under the dustcap ... :-)

Just received word from @[1160178016:2048:Joppe Peelen] that my planars (the ones on top) are nearing completion, can't wait 😎

Updated Dec 12, 2022 10:36:14pm

Amazing driver technology, magnetostats, sometimes referred to as 'planars' as well. Those looking for natural sounding pianos, guitars and brass reproductions should *really* give them a try. Attached clip is from Dag Wallander (thanks 😎) whom's mod makes me wonder if I should proto a Little/One planar as well...

Extremely excited about the planar mid-high drivers Joppe Peelen is working on as a replacement for the standard coaxial in a custom Grown/Up enclosure.

Using lessons learned from earlier builds this 3rd build of the 3way motional feedback BMH3D module is nearing completion. Fully analog Sallen Key filters, 70, 35 and 15 watts high efficiency class D amplification, 20dB StarBass servo loop, balanced miniXLR input. In a pick & place optimized mass production ready design. The basis for the Servolabs.nl Grown/Up and upcoming First/Love enclosures.

We've started a new dev cycle based upon 12" low, 5.25" mid and 1" high drivers.

Updated Nov 08, 2022 8:55:50am

Grown/Up 08S5 bass driver & accompanying bmh3d amplifier module.

For our Dutch fans...

Updated Oct 01, 2022 10:42:25pm

Updated Sep 29, 2022 1:20:25pm

Testing the newly developed Servo/Sub modules with a customer his TangBand drivers equipped with a StarBass V accelerometer. First results are promising, 40hz D3 is 20dB down, -3dB points at 27 and 300hz.

Updated Sep 19, 2022 9:29:50am

Ready for the zba group meet tomorrow (https://zelfbouwaudio.nl/forum/viewtopic.php?t=30739)

With Grown/Up and Little/One parts requiring an ever increasing amount of shelfspace the time has come to clear out some of the old enclosures & drivers which have been gathering dust for too long. Think old woofers (some modded with an accelerometer) mids and tweeters and some of the early mfb enclosures & modules, for those interested, keep an eye on the Motional Feedback Loudspeakers sales group.

Myself I will be using 4 x XLS10, 2 x L8S800 and 2 x SA8535 leftovers as a basis for a hobby project designed around grown up little one's finding their first love 😍

Have a great weekend you all !

In the process of adding images to the piratelogic driver page starting with the 08S5 which is used in our Grown/Up and upcoming Servo/Sub enclosures.

See https://piratelogic.nl/?p=en.drivers, click the highlighted link below ...

"I would like to test your little/one mk2 with an air motion transformer, can you help by making the tweeter connection available from outside ?"

Sure, no problem 😎

We've been silent because there was some major catching up to do with getting delayed parts into postponed deliveries and although still not fully out of the woodworks things are clearing up. Despite economic turbulence our sales numbers are still up resulting in our test rig showing growth beyond domestic proportions, time to start looking for some real demo space.

The long awaited LS3/mfb subs are now scheduled for Xmas 2022, sorry for the delay.

Building Little/One and Grown/Up amplifier modules using the Texas Instruments Tpa3116 class D poweramp.

Beyond Just Technology: these module cables are made from only the finest 6-nines Unobtanium™ alloy, molecularly assembled in our Alternate Universe™ reality-distortion tesseract field , using a secret geometry reverse-engineered from crashed UFOs, painstakingly smuggled out of Area 51 by deep-cover operatives. Performance is further enhanced by the use of a QuantConnect™ quantum-entangled pair of transmission interfaces, held at absolute zero by our exclusive Stasis Field™ technology. The cables are then wrapped in NanoAeroCap™, a nanotechnology-enabled aerogel anti-capacitance insulation system, featuring Fractal Interleaved Geometry™ to create negative inductance for maximum audio transmission quality.

Or, er, well . . . again, no. These are nice, high-quality Little/One system cables, with solid, reliable connectors. That’s it. Hope you like them!

(thanks Schiit Audio for the inspiration 😎 )

We've got some good and exciting news for Infinity IRS owners, Lautsprecher Manufaktur in Germany is working on servicing IRS servowoofers using our Starbass accelerometer products.

So we did the enclosures last week, this week has been mostly about module building, next week will be woofers mod week !

Building things :-)

update !

https://www.youtube.com/watch?v=Xc92_rjf8k0

Busy preparing the Grown/UP CNC gcode

Working hard preparing ourselves for the upcoming Grown/Up and Servo/Sub boards while at the same time doing preparations for the expiry of some universal patent next year.

Holidays greetings & the best wishes for the new year from Amsterdam, may the bass be with you all, stay healthy & happy !

We've come up with a new tribute candidate. Adding -3dB@30hz to your LS3/5a our LS3/se, SE for Servo Extension, measures 19x19x16.5 cm, comes equipped with it's own filtering, 18dB motional feedback servo loop, class D amplification and can either be connected directly to the LS3/5a binding posts or via a separate line level signal. Please leave your tips, thoughts and remarks in the comments below.

Due to the ever extending electronic components shortage it is taking a little longer to finish our first sub proto as we have to solder some of the surface mount devices ourselves 😎

We'be been strong advocates of the Texas Instruments tpa3116 and tpa3255 integrated solutions because of their sublime form factor and hard to beat price/performance ratio.

For 2022 we are planning to broaden our portfolio with add-on modules for powered modules from miniDSP and Pascal.

We finally managed to order a batch of coaxials for use with our Grown/Up 3 way MFB enclosure. If all works out - think covid - we're aiming it's product launch for Feb 2022. Like our Little/One Mk2 the Grown/Up will also be offered for review to the leading dutch Hifi page HiFi.nl

😊

Demo rig preparations for the upcoming Dutch Audio Event.

Please meet the latest addition to our Little family, the Little/Sub. Based upon the same proven tech as our Little/One but configured as a mono subwoofer channel in a 24x24x24 cm enclosure driving a Piratelogic 08S5-4 subwoofer.

Keep an eye on our sales site servolabs.nl for updates.

We will be attending the Dutch Audio Event trade show (formerly known as x-Fi) 30 & 31 October in Veldhoven, the Netherlands. Checkout dutchaudioevent.nl for tickets & details.

It's been a busy week working on several modules, those of you who have been following this page for some time know that I've been working on a fix for my Toyota Aygo awfull soundsystem and I'm very exited to share the first beta of the SD2B2H4D board with you. Based upon the proven Little/One tech this board contains a stereo 2 way system with onboard step-up module to lift the 12 battery supply to 24V. 80x100mm in size and designed to fit the 8cm deep the rear shelf without impacting the already tiny trunk.

Time for a beer now, have a great weekend you all !

About to test a new batch of Little/One modules 😎

Updated the Little/One productpage with MK2 info.

https://piratelogic.nl/?p=en.littleone

Already shown earlier this week, the two way DIY module sdbh2d - Servo Drive Bass High with 2 class D amplifiers - which represented the first member of the new automotive mfb series. The second member is the sdb1d, a Tpa3116 pbtl based 100 watt single channel mfb subwoofer module.

Good news for DIY mfb lovers, the newly developed SERVO/DRIVE module has survived it's first tests and is performing wonderfully. This 1st proto contains a 2way MFB system with 12dB servo loop, 2nd order Sallen Key xover, 2nd order high pass and includes an onboard Tpa3116 class D amplifier on a 66x50 cm PCB. Connect a tweeter and modified woofer, hookup 24V and a signal source and you are good to go.

I expect the next proto to become available for general consumption by Xmas this year and will be sold as a kit including the module and a StarBass V or ClingOn accelerometer. A youtube tutorial on howto modify a woofer is in the making. Pricing will be announced shortly and is targeted between 200 and 250 euro per set of two.

Second Little/One MK2 batch of 10 is taking shape.

Little/One bh2d amplifier module

Little/One MK2 enclosures

Adding this to our Grown/Up and Little/One 😎

"I need something big for my man cave, hearing low notes ain't enough, I need to FEEL the bass thumping against my chest. "

Feel free to comment below on our man/cave design thoughts (image not to scale :-) ) :

Low note : 14-100hz, impulse compensated dual longstroke 10" drivers with individual ClingOn loops. Mid note : 100-1000hz, current driven 8 inch in cardioid setting. High note: 1000-20K, pro ribbon. Initial test setup includes XLS10, L8S800 and SA8535 drivers but will change since both mid and hi are no longer in production.

The Little/One MK2 module frontpanel layout is taking shape.

Working hard to get our first batch of Little/One Mk2 enclosures ready.

There was a problem with our mailserver not allowing inbound messages which has been fixed, incase your email bounced please resend!

Busy building Little/One Mk2 modules .....

Modding a batch of Little/One Mk2 woofers with StarBass accelerometers.

Using the weekend to relax, sit back and enjoy some listening test with the original Little/One (top), the Mk2 with ScanSpeak & SB acoustics drivers and the Grown/Up 3 way systems. First impression is that except for the extra Grown/Up SPL the low note performance is pretty much identical between the lot. The real difference comes with the imaging depth and overall quality of the mid/high notes with the Little/One Mk2 performing significantly better then its predecessor.

Grown/Up development has also made a considerably leap forward with the new tpa3255 based bmh3d module offering increased power, spl and control.

3 way active enclosure with coaxial mid/high driver and a Piratelogic 08S5-4 servo woofer. 20dB feedback loop. 30hz - 20K @ -3dB. 24cm deep, 24cm width, 36cm height. Designed & build in Amsterdam by Chris & Chris.

Wondering if there would be a demand for little/one electronics in scale models like this...... Have a great weekend !

Just a quick update on what's brewing:

- The first listening tests with our SBacoustics tweeter and ScanSpeak woofer equipped Little/One Mk2 have finished, it's new drivers together with a xover lift to 3400hz have resulted in a remarkable sonical improvement over the original design. The bass performance remained identical but there is a clear improvement in female voice reproduction and overall high note resolution.

- The original Little/One has also received an update in the form of a newly developed accelerometer, the Stripper, with a decreased addition to Mms of just 1 gram (StarBass 54 = 3.5 grams) allowing it's Xover to be increased from 1500 to 2400hz, measurement details will follow on youtube.

- Our 3rd TPA3255 based Grown/Up amplifier module prototype has survived thermal testing, I hope to order the first release candidate pcb's within a week or 2.

- The raw power of the tpa3255 based Grown/Up module plus the popular demand for a stand alone Sub woofer solution has led to the development of a single channel servo subwoofer solution capable of delivering upto 315 into 4 or 495 Wrms into 2 ohms running of a single 48Vdc psu. ETA is xmas 2021.

Last but not least we're building a separate shop for module sales under the name ServoLabs.

A happy & healthy 2021 to you all !

Working on getting you RF interference free servo loops

We were planning on launching our new Grown/Up and improved Little/One Mk2 this Xmas but have decided to postpone things into 2021 hoping dr Anti/Virus will have normalized the trade show bizz by then.

With all the buzz surrounding these drivers plus the fact that there already appears a free tab waiting for a StarBass connection board we've asked Santa for a pair with their dust domes not yet mounted. If they perform as expected we're looking at shrinking our dear Little/One's even further.

We're silent because we're busy 😎

The new tpa3255 based Grown/Up 3 way module is up & running, the increase in servo control over the former tpa3116 module is remarkable.

We had our Croatian summer holiday dramatically shortened from the initial 2 weeks to just 3 days by this 0.1uM surface mounted disease known as covid 19 🤬 I've taken the opportunity for an early start assembling the already 4th prototype Grown/Up amplifier module.

We're safe & healthy sofar and hope the same applies to you and your loved ones, stay vigilant and remain careful out there please.

The EVE manual has received an update, a chapter on accelerometer selection was added.

https://piratelogic.nl/data/docs/products/eve/piratelogic.eve.2020.0.manual.en.pdf

Preparing a new chapter for the EVE manual on StarBass accelerometer model selection and ClingOn placement variants.

The first draft for the EVE 2020.0 manual is here, please put any irregularities or questions you might find or have into the comments below. Bare PCB's are available for 25 euro a piece, kits as well as smd prepopulated boards are expected to arrive week 27.

https://piratelogic.nl/data/docs/products/eve/piratelogic.eve.2020.0.manual.en.pdf

Busy writing the EVE 2020 manual with input from this diyaudio thread : https://www.diyaudio.com/forums/subwoofers/336070-mfb-aci-sv12-drivers-using-piratelogic-electronics.html

EVE 2020.0 sneak preview.

Just a quick update on what's cooking over at our servo labs. We're very happy to announce our first batch Little/Ones have all found new homes and we've started work on the second series with Scan Speak woofers, SB Acoustics tweeters and some work into copying the iconic 532 signal light for the new tribute 😎

The small PCB in the last picture is a tiny class B amplifier module called Anti/Dote which got created during lockdown as a puzzle alternative.

The new batch StarBass 54 pcb's have finally arrived, existing orders will be shipped next week.

StarBass V build 09APR2020 has been ordered. ETA May-June 2020.

Arta FR2 pink noise open loop ClingOn frequency response and phase margin measurements in CSS SDX10 driver. ClingOn decoupling happens at 5hz and 8Khz offering a valid foundation for further testing.

The ClingOn SDX10 measurements are looking good and will be published next week. Enjoy your weekend !

900+ organic likes, thank you servo lovers 😎

Modding a CSS SDX10 with a ClingOn accelerometer.

Enjoy your holidays & best wishes for the new year !

Grown/Up development has entered it's 4th prototype stage. Among the design changes are use of a Texas Instruments TPA3255 amplifier and post filter feedback to further minimize LC distortion. The PCB design is about 80% finished, live tests are scheduled for Feb 2020.

Please note the EVE kit is currently sold out, a new version is under development and expected to become available Q1 2020.

We're silent because we're busy 😎

Checking my mail while slowly recovering from a -20C° temperature dip - thanks Athens you are a truly unique place to visit 😍 - I found this, an ultra low noise coreless current sensor from AKM which will be used with my next EVE build to add optional current feedback. ETA Xmas 2k19.

We're taking a break !

For those driving small economy cars like us getting a decent bass response from the in car sound system can proof challenging, specially since space for subwoofers is limited. So we've started a 12V design on something that will fit the standard back shelf and will be only 7cm deep.

The Grown/Up module lends itself not just for building new enclosures, it's also fun to use it for modding vintage enclosures like this B&O S-45 three way 😎

KIT in the making 😎

Just returned from a short holiday break, slowly getting back to work. Already found some good looking StarBass & EVE testresults on diyaudio :-)

https://www.diyaudio.com/forums/subwoofers/336070-mfb-aci-sv12-drivers-using-piratelogic-electronics-4.html#post5790742

Finally found a few hours time to update https://piratelogic.nl/ It still ain't 100% ready but we're getting there.

"I have been using two of these vented 6.5 cu. ft. subs with my stereo/home theatre system since 2000. While they have been re-aligned since then, they are big and they are not pretty. I plan to repurpose these 'classic' drivers in a servo-feedback design or die trying. "

https://www.diyaudio.com/forums/subwoofers/336070-mfb-aci-sv12-drivers-using-piratelogic-electronics-3.html

Almost can't wait for Chris to finish our next Grown/Up prototype mfb enclosure, a combination of a 4 inch Omnes Audio CX3.0 coaxial mid/high driver and a 8 inch Piratelogic woofer equipped with a StarBass V servo drive accelerometer. 24x24x35 cm, 20 liter, fully active 3 way design with 4th order LR filters, 100 watts total RMS power, -3dB @ 30hz. Working hard to get things ready for this years XFI Premium Audio Show 😎

For those feeling reluctant to start cutting into polypropylene cones / not feeling entirely confident removing dustdomes / trying to avoid nightmare scenarios wasting expensive drivers : a modification guideline with usefull tips & tricks is in the making.

ISE2019 in a nutshell. Thanks for being a cool spot for evangelizing servo bass 😎

Any Tina users overhere ?

Piratelogic Grown/Up development.

741 likes. Thank you !!!

ISE 2019 RAI Amsterdam preparations 😎

Morten from Denmark asked what the best spot would be for a ClingOn accelerometer to be fitted into his JBL2241 driver and made this nice infographic, love it 😎

Location A on top of the voicecoil former is the most ideal location from a linearity / basestrain perspective but requires cutting the dustcap.

Location B is less ideal due to possible pickup of dustdome resonances and flexing of the sensor base.

Location C increases the risk of picking op partial cone movement - breakup and also posses the risk of introducing an asymmetrical load to the VC.

Location D is our favourite for now.

Happy 2K19 !!!

As of today our Little/One's are on demo at Headphone Auditions Amsterdam

We finally found an high end audio shop willing to give our Little/One a chance. Located downtown Amsterdam and filled right from its rooftop downto its basement with serious audio. The only demand made was for a stylish enclosure matching their signature brand so we came up with this nice looking wooden version on top of it's little Tribute brother. The name of the shop will be announced next week once the demo is in place.

Equipped with our latest StarBass servo technology this little/one - 17 x 17 x 24 cm - will happily reproduce anything between 30hz and 15Khz @ -3dB.
.

We just completed some preliminary tests with our first ClingOn prototype and a wavecor SW223 driver, looking at the sensor FR response a 12 dB D3 reduction at 600 Hz should work just fine 😎😎😎

With the increasing number of high power long excursion drivers entering our pirateship :-) it's time to bring in some serious testing gear.

Meet our latest StarBass VI testing victim, the SDX 12 inch long stroke sub woofer by CSS. Sponsored by miniDSP.nl 😎

The coming week will be spend on fixing vintage mfb gear, building Little/One, EVE and StarBass modules and cooking Indonesian food. I love my job😎

One of the Grown/Up design goals is to separate the xover and correction logic from the power amplification to allow the module to be used with a large variety of systems.

One of the many possible combinations is shown below where the bass channel is powered by a TPA3116 in power BTL mode delivering upto 100watts in 2ohms combined with a standard stereo module delivering upto 50 watts into the mid and high channels.

Although by no means high-end it's pretty surprising what these cheap modules are capable of, especially with the stock output filters modded to match the connected drivers impedances.

Ah. The Grown/Up pcb's are in.

Heads up - the current StarBass designs contain a flaw for the PNP transistor pin out which was brought to my attention by Noel Neu (thanks !!) The current versions do work properly but lack the extra linearity provided by the extra PNP transistor. New StarBass V and VI versions are being developed that fix the pinout issue.

Working on the MFB controller / x-over for the upcoming release of the Wrinex MFB Planar and Piratelogic Grown/Up enclosures.

Have been busy lately with all sorts of MFB related things, just a quick update to keep ya'll informed. The StarBass V prototypes are sold out. The next StarBass VI prototype supporting a 2S2P Murata sensor setup and voicecoil diameters up to 3 inch is expected to arrive within 2 to 3 weeks. Besides acceleration sensor development the focus is broadened to include DSP MFB processing with these MFBlabs ADAU1777 based proto boards.

Like with any other loudspeaker system one of the main design challenges is with integrating the low, mid and high drivers into something resembling a point source. One route is to use coaxial drivers like Genelec does with their Ones. An alternative route worth investigating is the combination with a planar drivers like electrostats or magnetostats.

"M-Force redefines the notion of a traditional transducer, with its parallel moving magnets generating linear movement, surpassing all the limitations brought by the need of purposely wasting power in order to move the mass of a moving coil.

This linear movement is achieved without the aid of any rotary to linear converter, making the M-Force a native push-pull device, capable of delivering perfectly symmetrical performances. The sheer force alone allows to drastically reduce cabinet’s volume to SPL ratio, whilst retaining outstanding sound performances, allowing for extremely deep and defined low ends. "

Can't wait.

(Can't wait as in can't wait to have my sales figures justify investments on drivers like these. Small steps, it took a brand like Genelec 40 years to arrive where they are nowadays, we've only just started.)

They grow up so fast...😎

Shown below is the Klippel analyzer Bl (X) curve from the VoiceCoil Test Bench report on the Scan-Speak 28W/4578T00. The asymmetry between BL for the in and outgoing motion is typically something to be addressed by a motional feedback loop.

€799 per set! Order now, you won’t be disappointed😎

2017 been a good year for motional feedback, may 2018 be even better !

Have yourself a merry little/one Christmas,
May all your bass be low!

Dear fellow motional feedback enthusiasts,

It's been a rocky year with lots of interesting new developments in electronics, accelerometers and subsonic enjoyments. We're very excited the time is near for our little/one's to leave the proto nest and fly out into the big open source.

We're enjoying a holiday break starting this friday 22dec until 8 Jan next year. May the force be with you and your love ones,

Season greetings from Amsterdam & a happy 2K18 !

Working hard on getting the Little One module build manual ready. Starting with the Dutch version....

541 likes, thank you all for your support in making MFB great again :-) Now working towards 544, 545, 567, 585, 586 and 587 :-)

Audiofriends, where we obtain our accelerometer connection litze, dustdomes and rubber & foam surrounds has posted a new video about removing drivers from their enclosures without damaging the original ornamental rings.

https://youtu.be/ZKEWSJSKMD8

New toys.

532 likes ! next milestones are 541, 544, 545, 567, 585, 586 and 587 :-)

2012, 587 clone. Time flies 😎

"In studio use, speakers have to survive things like when you PFL a bass drum or bass guitar and it comes through at peak level, or you select a drum overhead just as someone smashes a cymbal and you haven't set the mic levels yet. It's quite a design challenge on top of pure performance..."

True, a flat FR is only the beginning.

Been a while since the last update, sorry for that. Busy building, servicing, overhauling and designing things.

Piratelogic sunday afternoon team meeting, from left to right :

Ariën - dsp / streaming software development, Emmy - sales & marketing, Sonny - electronics design & artwork, Chris - cosmetics & enclosure design

While testing the StarBass with the Seas L26R04Y usage of the accelerometer with other popular long stroke subwoofers is being investigated. Among them the Peerless XLS10 driver with its challenging extended polepiece.

StarBass testing material.

Tis tijd om plek te maken voor mijn Little/One en ben daarom begonnen met de verkoop van een voorraad Phillips MFB boxen. Heb je interesse in een setje 544 of 532 laat dan even een berichtje achter. Richtprijs is 125 euro voor een werkende en 250 voor een gereviseerde set.

Voor details zie http://www.mfbfreaks.com/forum/viewtopic.php?f=10&t=9807

I need more space for my Little/One's and will be selling a number of vintage Philips 532 and 544 mfb enclosures. Pricing : 125 for a working and 250 for a revised set.

Busy 😎😎😎

Next to servicing, overhauling and building new motional feedback enclosures the latest Starbass accelerometer prototype tests pave the way for studio monitors like the Adam A7 to be modded into true MFB enclosures.

17 good intentions for 2017. Lots of subbass love from Amsterdam & Take care.

Just received word from my pcb shop that the new starbass motional feedback accelerometer design prototype has been shipped. Can't wait to test them.

The Little/One electronics run of 24V which allows for mobile use using these 18650 li-ion cells. A 6S2P setup with 3400mAh cells contains 163Wh, enough energy for upto 4 hours @ full power.

It's weekend, time to relax and think out of the box 😎

The first oak enclosure, made from excess floorboard.

the first series of 10 little/one's is slowly coming along ...

The Ekomatic pcb's for the 532, 544 and 567 are in and yes, they are small 😁

Almost done...

Testing cables, plugs & sockets

Kevlar test...

The Little/One's are coming!

Great article by Erno Borbely : " I use DC coupling whenever possible, because I don’t like “capacitor sound” and also because I am “allergic” to the prices of so-called high-end capacitors."

http://audioxpress.com/article/EB-604-410-All-JFET-Line-Amp-Starter-Kit.html

De 10de zelfbouwaudio dag samen met MFBfreaks was een succes !

Nu de printjes in bestelling zijn maar even van de gelegenheid gebruik gemaakt om de anders toch een beetje duffe zondagmiddag creatief in te vullen met de voorbereidingen voor het Little/One kastje.

Did you know we use MFB to create modern musical paintings ? Checkout Archidio

Vraagje : wie heeft er hier de beschikking over een dode kamer ?

Busy building my first Revision/One 2015 ...

Planned for Xmas 2015, the new #revone Revision/One 2015. Shown below is beta 1, I expect the release candidate to be ready in a few weeks.

It's form factor hasn't changed so it will still fit snugly into your old 22RH532, 22RH544 and 22RH567 motional feedback enclosures. But inside are all the lessons learned from the Rev/One 2014, the standby logic has been fixed, the high note darlingtons have been upgraded to a bdx pair similar to the one used in the mid note channel. The highnote output capacity has been increased as well as it's bootstrap cap. The original 544 mid & tweeter protection has been added,

Another major change is the use of Vishay 256 series snapin capacitors for the power supply and low-note amp output. These caps combine excellent ESR figures with just 2 soldering points - a big improvement over the 60+ for the 2014 model.

The pcb floorplan has been further optimized, the box connector has been moved down to avoid the cable from damaging while closing the door. The standby logic has been moved to the middle to minimize mains cabling lengths.

Waarom is dit bericht in het engels ? omdat er fransen, engelsen en italianen meelezen :-)

8 x 541, #abcmfb powered, 11 cm deep, full colour painting 120 x 70 cm.

Met een beetje mazzel kan volgende week het tweede prototype van de ABCMFB print de deur uit. Naast printloop optimalisaties zitten er een aantal belangrijke verbeteringen in zoals de mogelijkheid om de fase van de MFB correctielus om te draaien waardoor de abcmfb het zowel doet in de 544 als de 587 serie. Verder zijn er wat mlcc's vervangen door standaard elco's, heeft de regulator voor de NE5532 een upgrade gekregen en is het dynamische gedrag van het rumble filter verder verbeterd.

Heerlijk frezen met zo'n malletje

ABC frontje met getrapte gaten voor de 7066 en 0160

de allereerste ABCMFB (AutoBootCaravan) module is een feit !

Gisteren begonnen met de Rev/One versie 2015 met als belangrijkste verbeterpunten voor de highnote: dikkere eindtorren, 220uF uitgangscapaciteit, voor de midnote : toevoeging van een overbelasting detectie en lownote : aanpassing van TO3 shape zodat er geen eilandjes meer weggekrast hoeven worden. Verder worden de diverse voedings sporen opnieuw gelegd om de stoorafstanden verder te vergroten en wordt de plaatsing van het voedingscircuit van de correctie versterker onder de loep genomen.

En weer een herboren setje 532, wat een wereld product was/is het toch !

De Revision/One krijgt langzaam vorm, alleen nog de brugcel en eindtransistoren monteren en dan kan de spanning erop ...