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gainphile

Class-D 8-channel amplifier build

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I'm starting a new thread for this amp which will amplify my MiniDSP XO outputs.

So I think I've figured out my rough design. I'll elaborate more on my build thread but it basically goes according to the picture I lovingly drew. I'm thinking of also using those tripath amps but need to find out how gainphile powered them. All-in-all it could turn out to be a very cheap build (objectively)

I will be using switched Power supply unit from sure electronics.

"24V DC 14.6A 350W Regulated Switching Power Supply"

PT-IP006.jpg

It just arrived today so I will have the whole amps assembled this weekend.

The whole thing is experimental to me. Both the Class D amps and the PSU especially the fan (it's supposedly temperature-controlled, not on all the time). It's because I don't have the energy to build and solder gainclones which I know is sonically transparent (although I already have all the chips and audiosector boards).

The amps are two of "4*100W TK2050 TP2050 Tripath D-class Amplifier Board" from Sure Electronics (eBay).

5553_5984.jpg

Total cost for the 2 amp boards (8 channels total) + 1 PSU is $160. I'll add $80 for casing and connectors.

The driven speakers are 4-way dipoles. Today they still lack the last bottom octave as a 3-way. But ok 90% of the time except synthesized music stuff. The subwoofers would be dipole W-frame subs for 20-40z as used in SL's Phoenix.

[ATTACH=CONFIG]24875[/ATTACH]

Maybe at that time I'll add the 2nd PSU.

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Yes. One my objective/experiment is to validate that generally electronics are very accurate/transparent compared to electro-mechanical transducers such as Loudspeakers (+ room acoustics).

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At least you can use it to power 8 subwoofers later!

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A very interesting project there Andi!

One thing I wonder about is using Class D for tweeters - is that the plan? I'd be a bit wary of that. You might notice that Adam speakers, although they like to promote class D amps in general, they use AB for the tweeters.

I tend to agree that the electronics are hardly the worst offenders.

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Guest Drizzt

Excellent stuff gainphile. I look forward to reading your results.

Definitely good value for money if the performance is up to your standards.

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Oh sweet. I think I'm gonna just buy an amp for my main speakers, but this could be fun for the bedroom or workshop

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So tell us how they sound!

I'm actually about to embark on a similar experiment myself very soon. Will be modifying a set of speakers with the miniDSP and a similar class D chipamp. So very interested to hear how easy it all is/was, and how you like the listening experience at the end.

Seems my decision not to buy an AVR with pre-outs might be one I live to regret though. I'll post in a seperate thread once I start on my own experiment, as see how the results compare to your own.

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