Piratelogic

Motional feedback accelerometer research and development. Brains beat boom. True bass response is assured, even from small enclosures. Brains really do beat boom.

Reproducing bass tones without distortion has always been the most serious problem for designers of loudspeaker enclosures. Large amounts of electrical power have to be translated into air-pressure variations, and in doing so, the speaker cone can easily get out of control, partly due to the effects of the enclosure. Designers have tried to solve the problem by putting very large loudspeakers into

very bulky cabinets, and by using vented ports or transmission lines, but these produce their own problems. The real answer is to stop the enclosure from influencing the movement of the bass loudspeaker cone - and this is precisely what the Philips accomplished with their MFB - motional feedback - system some 30 years ago. A piezo electric element on the cone produces a voltage in proportion to the cone's vibration. This is fed back and compared to the voltage that made the cone vibrate in the first place. If there's any difference, corrective action is instantly taken, so that the cone is incapable of distorting the sound. Piratelogic rejuvenated the MFB system by combining modern sensor technology with state of the art electronics, it's beautiful sound will tell you more then anything we can say.

10/05/2026

I've asked Claude to help me find a name for a subwoofer product I'm working on, pretty amazing what it came up with. It looks like it Found/One.

05/05/2026

I've been working on the Grown/Up successor for some time now, mainly focusing on a larger woofer. The downside of such approach is the negative effect its larger enclosure has on the wife acceptance factor. Tests with Grown/Ups paired with extra woofers are sooo convincing I'm revisiting my hidden servo sub design.

Easily daisy chained via balanced xlr inputs to your Grown/Up's or any other active full-range setup.

22/03/2026

We've enjoyed a thoroughly productive weekend 😎

04/03/2026

Unbelievable its already 12 years ago since we started building our own feedback loops 😎

17/02/2026

Let's focus on providing loudspeaker solutions for the topping, smsl and schiit's of this world shall we ?

The same fixes keep getting tried, but they keep failing for the same reasons across multiple brands.

04/02/2026

"The attack of a plucked string reaches the ear at the moment the player’s finger moves, not several milliseconds later. What conventional speakers round off, a fast driver preserves: the leading edge that makes a live instrument sound alive."

Servo control: nothing smeared, nothing delayed. Just truth in motion, hear sound exactly when it happens 😎

What looks like progress on a spec sheet may have erased something listeners still miss.

23/12/2025

Hey there!
You’re probably used to seeing the occasional picture of random techy gadgets pop up here. But since I’m slightly over the endless Christmas pictures with the same old “Happy New Year” captions… I figured: let’s mix things up.

Because besides tech, cooking is my other big love. So instead of blinking LEDs and circuit boards — a recipe. One I picked up during a visit to a teppan joint: Japanese Nasi 🍚🔥if you want the actual recipe, just shout in the comments and I’ll drop the loot.

Love & kisses & best wishes from Diemen, the Netherlands. See y'all next year !

16/10/2025

It's always exciting to see if a prototype works right out of the box and we're delighted being able to report that our first discrete charge amplifier equipped Starbass is up and running offering greater bandwidth, output, and lower noise figures then our standard jFet equipped models. Originally aimed at use with larger diameter drivers and low x-max, but also applicable as a low noise sensor in long stroke systems

23/09/2025

It took a bit longer than initially anticipated — the first design steps date back to 2023 — but the first prototype of the StarBass DCA is finally in the works. The form factor is identical to the well-known Starbass 54, but instead of a jFet follower the DCA is equipped with a differential charge amplifier to boost the Murata signal to usable values without compromising the signal-to-noise ratio, something that is especially welcome with larger, high-efficiency drivers.

All things servo. StarBass drivers & accelerometers, loop electronics and cash & carry Little/One and Grown/Up sales via servolabs.nl

09/09/2025

I've previously dedicated a graph to the relationship between loop gain, frequency response, and sound pressure level (SPL) and on several occasions pointed out the relationship between bass extension and maximum achievable SPL, but that apparently still left room for interpretation🙃

So, "design limits" was added to the EVE doc. Updated links in the comments.

Adres

Diemen

Website

http://piratelogic.nl/

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