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Old 17th July 2013, 09:08 AM   #1
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Join Date: Feb 2009
Default Class D amps....

Just finished setting up and running in my Classic-D from silicon chip.
Powering a self built twin 8 in sealed sub.

Damn. Class D amps sound so... open and powerful. Effortless.

Relaxing here listening to some nice open trance tracks with a nice german beer.

That is all
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Old 17th July 2013, 09:42 AM   #2
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Join Date: Jun 2013
Location: Melbourne
Come on, you can't just leave it there!

How about a bit of detail? Supply voltage, the power needs of the sub, the brand of beer? You need to get others interested and salivating.
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Old 17th July 2013, 09:48 AM   #3
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I too am interested in your impressions as I also have a twin 8" sub and am looking for an amp to drive it.
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Old 17th July 2013, 10:01 AM   #4
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Ok this class D is the standard classic-D kit from silicon chip.
57 volt rails with a CLC filter and 20000 uF per rail, on a 300VA toroid, twin bridge rectifiers.

No modifications at all so far, as its only bass, so didnt see the need to preserve any high frequency detail.

The beauty of these kits is that reversing phase is a simple jumper away. 1-2 or 2-3 to reverse phase.

German beer, is a Paulaner Munchen. Hefe-weizen.

Listening to Globespinning - mixed by Cardamar


The subwoofer is a 55 litre sealed enclosure, twin 8 inch vifa subwoofer drivers from jaycar. They are 8 ohms, in parallel.

This is all being driven ( along with the 5 satellites driven by LM3875T's) by a auzentech x-fi Forte.

All in all, proving to be a nice relaxing evening.


Click the image to open in full size.

Class D amps are bizarre. Pushing out massive bass, but the heatsink is cool to touch. Ignore those blue MKT's they are gone now.
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Old 17th July 2013, 10:17 AM   #5
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Click the image to open in full size.

Last edited by Rainwulf; 17th July 2013 at 10:30 AM.
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Old 17th July 2013, 10:36 AM   #6
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btw, the hottest thing in this amp after running full bore for a few hours.. is the speaker protector relays. Lucky they are on a variable voltage PSU so i can wind them down to 10 volts to save power and heat.

Click the image to open in full size.
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