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Class D Switching Power Amplifiers and Power D/A conversion

Sure Electronics AA-AB32313  2x400
Sure Electronics AA-AB32313  2x400
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Old 3rd November 2016, 10:17 PM   #21
seanp2k is offline seanp2k  United States
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It looks like the specs on the AA-AB32514 are much better than the AA-AB32512:

SNR260W @3Ω THD+N 1%-78.429-dB vs 310W @3Ω THD+N 1%-95-dB
Output Noise Level A-weighting,Input Connected to GND 355.62 ÁV vs 240uV
Noise Floor -50.599 vs -103.753
seems to run about 18c cooler (check scale in thermal shots) -- possibly fine with no fan on the heatsink.

The 32514 looks like the one to get, assuming it sounds as good as the others.
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Old 4th November 2016, 12:02 AM   #22
denbret is offline denbret  Canada
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yes in appearance, but the distortion between 3-7 kHz is higher. I think this is a better candidate for a subwoofer. my two pennies.
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Old 4th November 2016, 10:46 AM   #23
wdecho is offline wdecho  United States
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Sure Electronics AA-AB32313  2x400
Quote:
Originally Posted by denbret View Post
I don't know. surely a tk2050, which I believe are chips of the same company, ST Electronics, but older. I already had a tk2050 hifimediy of the t4, and I did not like the sound.

So everything depends on the implementation. But I would trust the 100w, another member has the 200w and is very satisfied.
I am still very satisfied with the 200W after doing some comparisons with some of my other amps. After just recently building the V-fet amp by Nelson Pass there is no doubt that the V-fet is in another class but this $40 board is still amazing me in the sound for such little money. A V-fet built by Nelson Pass was auctioned off on Ebay for a worthy cause recently and brought $3500 for a comparison of cost. My test is could if I live with a new amp I have built if it were my only amp and the answer is yes for the AA-AB32281 and it sounds much better than some of my other amps I have built using the same test. This is with a Meanwell 24V switcher turn up to 29V at 6.5 amps 150W. Plenty enough power using horns. Ridiculous for the quality of sound for $40.

Last edited by wdecho; 4th November 2016 at 10:49 AM.
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Old 27th November 2016, 06:33 AM   #24
ppy is offline ppy  Russian Federation
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I am also very pleased with the sound of AA-AB32313. I have tried a lot of different amplifiers Class D. AA-AB32313 it is better that I could hear. The main amplifier in my house - Class A Pass Aleph. In direct comparison, AA-AB32313 and Pass Aleph, of course wins Class A. But the benefits are very small. In a blind test with a pause of 5 minutes I was probably not unlike those amplifiers.
Be sure to replace the input ceramic capacitors - SW1 OFF and install Elna Silmic II.
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Last edited by ppy; 27th November 2016 at 06:36 AM.
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Old 27th November 2016, 09:02 AM   #25
Nikkem is offline Nikkem
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Hi, in your opinion ab32313 Can amplify easily a pair of rbh mc-6ct mk2 (87 Db 6ohm)?

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Old 27th November 2016, 09:02 AM   #26
Nikkem is offline Nikkem
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Could It be better than a nad c355? Thanks

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Old 27th November 2016, 12:00 PM   #27
canvas is offline canvas  Taiwan
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How about AA-AB31321 800W T-AMP? It's rated 800W at 1.5ohm, so it should be 400W at 3ohm. I heard monoblock is better than stereo.

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Old 27th November 2016, 02:50 PM   #28
wushuliu is offline wushuliu  United States
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Quote:
Originally Posted by wdecho View Post
I am still very satisfied with the 200W after doing some comparisons with some of my other amps. After just recently building the V-fet amp by Nelson Pass there is no doubt that the V-fet is in another class but this $40 board is still amazing me in the sound for such little money. A V-fet built by Nelson Pass was auctioned off on Ebay for a worthy cause recently and brought $3500 for a comparison of cost. My test is could if I live with a new amp I have built if it were my only amp and the answer is yes for the AA-AB32281 and it sounds much better than some of my other amps I have built using the same test. This is with a Meanwell 24V switcher turn up to 29V at 6.5 amps 150W. Plenty enough power using horns. Ridiculous for the quality of sound for $40.
If these boards are like previous Sure tripath based amps then you will want to replace those power supply caps along the side and go linear instead of the switcher. You should get substantial benefit from that.

Last edited by wushuliu; 27th November 2016 at 02:52 PM.
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Old 27th November 2016, 02:59 PM   #29
wushuliu is offline wushuliu  United States
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Quote:
Originally Posted by Buehgemeiste View Post
I'm onboard.
What are your thoughts on these amps?
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Old 27th November 2016, 03:05 PM   #30
Buehgemeiste is offline Buehgemeiste
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I didn't hear one, yet.
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