Help a beginner in choosing a 4 channel amp configuration

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bcodemz

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Joined 2014
#1
I would like to get some advice on a 4 channel amp and PSU for an active speaker I'm building. The problem is that I'm an amp beginner, so I don't have the knowledge or capabilities of doing more advanced amp work.

I'm powering some very high fidelity drivers with this amp, so good sound quality would be very nice. There are two 4 ohm woofers that wants around 70W, and I would like the amp to be able to hit that.

Initially, I am thinking of using a Sure 4 channel TK2050 board with the 300W 28V PSU from Hifimediy.

Sure Electronics AA-AB33182 4x100W at 4 Ohm Class D Digital Audio Amplifier Board STA508 (TK2050)
SMPS300R 28V 110V power supply

While this would be a very simple and doable setup, it is limiting in many ways. From what I've read, the sound quality isn't up to par with something like a TPA3116. Also, the amp can only produce 64W @ 4 ohm @ 1% THD with a 30V PSU. With a 28V PSU it is probably only going to be in the 50's.

So the ideal setup would be a TPA3116 driving the Scanspeak mid and tweeter and something high powered like the TDA7498E to power the 2 woofers. However, these two amps operate on 2 different voltages, and I don't have enough space for 2 PSU's in the speaker. Even if I did, I don't wanna deal with 2 power connectors into the speaker.

Is there any other routes I could possibly take?

Thanks guys.
 
#3
Kjeldsen said:
I you will only use the same PSU, then you get approx the same power no matter the class d module you choose. You can just use TPA3116 for all speakers then.
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I'm not quite sure what you mean by using the same PSU and using it for any class D module I choose. How does that work? How can I use TPA3116 for all the speakers?

Kjeldsen said:
There are also more powerfull TPA's. Sinewave are making one with integrated PSU
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Could you please give a link to this Sinewave TPA with an integrated PSU? Thanks
 
#5
Thanks for that link. I found a more suitable amplifier from your link

Aliexpress.com : Buy 4CHANNEL CLASS D +SMPS 400W PRO AUDIO AMPLIFIER MODULE ,4CH OR2CH OR 2.1CH SET EASILY from Reliable module programmer suppliers on SINEWAVE SAMPLE STORE

This is exactly what I want. 4 channel, high power, integrated PSU, small form factor, low price. How is the sound quality on the TDA8950TH?

Unfortunately I have to buy 10 when I only need 2. I set up a group buy to see if anyone else would be interested.
 
#10
pguerin said:
IMHO 50ASX2 SE modules are much better sounding than the TPA3116's modules thought they are more more exepensive. You can put two of them in a 1U case, you can have a look at :

http://www.diyaudio.com/forums/clas...iy-just-buy-commercial-amp-3.html#post4758002

And the very interresting blog of Nisbeth :

https://theslowdiyer.wordpress.com/2013/08/25/past-projects-6-channel-icepower50asx-amp/
Click to expand...

That's a really excellent suggestion. I knew about how great the ICEpower amps are, but I thought their smallest one is 300W. I did not know ICEpower made modules this small and "affordable". I can't believe this is the first time I've heard about this. Tiny size, top tier sound quality, integrated power supply, and only $99, I don't know why this isn't more popular since most of the cheap class D amps will come sort of close to $99 once you factor in the price of a power supply.

I could fit a 50ASX2 for the mid and tweeter and a 125ASX2 for the pair of woofers. That said, it is still quite pricey - looking at $275 for both vs ~$130 for a Csinewave T400D.
 
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