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Old 13th April 2013, 09:41 AM   #31
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While reading this I couldn't help but notice some similarities between Rick's plans and the 537 prototype I have been working on for some time now. The 537 consists of a fully discrete 3way subtractive filter, motional feedback correction, limiter and a 3886 trio with dc protection. The subtractive filter is based upon the 22AH587 Philips MFB enclosure. The whole project gets discussed over here , for those who's Dutch tends to be a little rusty, feel free to try the googleated version

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Component side

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Schematic

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xover print w/ limiter & mfb correction.

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Component side

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Schematic

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even the woofer looks similar be it this is an 8 inch driver

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Last edited by chriscam; 13th April 2013 at 09:56 AM. Reason: cosmetics
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Old 13th April 2013, 07:34 PM   #32
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Thanks Chriscam.
I took a look but my knowledge of electronics is zero.
Is there a kit i can buy? Because that seems to be exactly what i need.
The 3 LM3886, are they each working in stereo?
So one board like this is enough for two 3 way speakers?

Thanks
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Old 13th April 2013, 07:53 PM   #33
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Quote:
Originally Posted by RickDangerous View Post
The 3 LM3886, are they each working in stereo?
Nope, the LM3886 is a single channel amp, in order to do stereo you need two sets, i.e. 2 xover boards and 2 amp boards. The 537 is still very much in beta, once things are ready for production I'll move into the vendor area.
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Old 13th April 2013, 08:43 PM   #34
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Doesnt this motion feedback thingy require specially equipped speakers, with a velocity meter?
Sounds like it makes things a tad complicated, no?
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Old 13th April 2013, 10:51 PM   #35
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Quote:
Originally Posted by RickDangerous View Post
Doesnt this motion feedback thingy require specially equipped speakers, with a velocity meter?
Sounds like it makes things a tad complicated, no?
Yes it does require using a modified piezobuzzer mounted on top of the voicecoil, and yes, but it's fun to decomplicated it

see mfb.piratelogic.nl
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Old 15th April 2013, 12:03 PM   #36
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Quote:
Originally Posted by RickDangerous View Post
Doesnt this motion feedback thingy require specially equipped speakers, with a velocity meter?
Sounds like it makes things a tad complicated, no?
This was an interesting proposition from Jeff Macaulay published in Electronics world years ago using a dual voice coil spkr: http://www.macaulayaudio.co.uk/roaring%20sub.pdf
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