Piratelogic

We've concluded prototype testing our latest 4BMH6D board and have gathered enough mods & fixes to justify a release candidate, so now that the electronics are nearing completion time has come to go look for appropriate drivers. Luckily we have tools like loudspeakerdatabase.com to narrow down the immense selection of drivers out there. We're looking for 10" woofers and 8 inch coaxials.

With the upcoming HiFi.nl review of my Grown/Up I've spend some time writing a technical document for it. Enjoy & have a great weekend.

piratelogic.nl

Waiting for JLCPCB to replenisch some XR7 caps 😎

Wise words by an industry icon.

Audiophile Icon Mark Levinson Reveals Industry Secrets - Part 1 In this exclusive interview series, I sit down with audiophile icon Mark Levinson for a 2 hour zoom interview covering a wide range of topics from his backgr...

The development of the first/love amplifier module is progressing according to schedule. Like its predecessor, the BMH3D from the Grown/Up, the 4BMH6D also has an active mid and high channel, but adds 4 separate bass channels.

Because research has shown that 4 8-inch speakers sound just as convincing as a single 15-inch.

EVE 2024 manual update, general availability is planned for July this year.

piratelogic.nl

And then all of a sudden we seem to have accumulated over 1K likes. Thanks folks 🙏 feel free to use the comments below to show your servo entanglements 😎

Had a great demo day showing folks what my BMH3D 3way amplifier module is capable of.

A batch of 50 new EVE modules with all bottom side SMD components factory mounted has just been ordered.

Who needs google ads with customers like ours ?

"The sound technology (pun!) still exists and is luckily deployed by unfortunately only a handful of speaker designers and builders. One of which is Servolabs from that same Netherlands (to make dutch based Philips proud as a light-bulb). Servolabs offers a small and less small speaker, aptly called Little one and Grown up. Combine this with the development in digital and analog integrating technology provided by RaspberryPi and Hifiberry one realizes that stellar audio quality does not have to be unreachable expensive as in the digital domain software nowadays is magnitudes faster in measuring distortion and counter act it. The excellent engineering of servolabs MFB does exactly what the huge Quad electrostates prevent physically by using the tiniest piece of real-time measuring and correcting."

A RaspberryPi/Hifiberry DAC+ Pro and two Little Ones - Squeezebox : Community : Forums Much in lieu with my previous post (https://forums.slimdevices.com/forum/user-forums/system-photos/44101-a-sb3-a-quad-303-and-the-left-hand-esl) here of 15 years ago an update is needed. Don´t worry the Quads are still alive and kicking. But I thought about a more modern and a bit slighter version ...

For those suffering from room modes, here is a great clip on the art of artificial window enlargement.

Roger Roschnik (PSI Audio): "Low frequency active velocity acoustic absorber" About the Event: http://mikroforum.schoeps.de/Roger Roschnik (PSI Audio)Roger Roschnik is the CEO of PSI Audio who manufactures monitors under their own bran...

Been a great fan of planars ever since I enjoyed a pair of Magnepans back in the nineties, their sheer speed, openess, accuracy and ability for natural sound reproduction makes them hard to forget. Except maybe for the really really low notes, hence my long standing wish to combine a pair with a servo bottom.

Motional Feedback Audio. verkoop, reparatie, revisie en nieuwbouw van motional feedback luidsprekers en versterkers, advies en modules voor zelfbouw, mobiele mfb oplossingen, mfb voor in de auto, boot en caravan

Working on getting you EVE 2K24, eta Q2 2024 ... main updates:

- pxe bias out for easy measuring of optimal bias setting
- starbass jst compatible pin layout, pin 2 = gnd (todo)
- improved lower bandwith pole @ 1.9 hz
- fixed 2020 balanced out bug
- bottom side smd factory populated

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

A freshly designed batch is planned for 2k24, stay tuned 😎

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

Motional Feedback Audio. verkoop, reparatie, revisie en nieuwbouw van motional feedback luidsprekers en versterkers, advies en modules voor zelfbouw, mobiele mfb oplossingen, mfb voor in de auto, boot en caravan

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.

Motional Feedback Audio. verkoop, reparatie, revisie en nieuwbouw van motional feedback luidsprekers en versterkers, advies en modules voor zelfbouw, mobiele mfb oplossingen, mfb voor in de auto, boot en caravan

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