really low noise floor amplifier for speakers?

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realflow100

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Joined 2012
#1
I'm trying to find a cheap amplifier that can do around 15 to 30 watts per channel and have an extremely low noise floor where you can only hear it if you put your ear right up to the tweeter with the volume knob turned all the way up.
like at normal listening volume level you could plug headphones into the speaker output and hear only a little bit of quiet noise that you can barely hear.
it doesnt have to be SUPER expensive. but around 50$ or less range would be nice. up to 100$ maximum?
Any good selections for something like this?
right now I have a "WINGONEER TPA3116D2 250W Digital Power Amplifier Board Class D DC12V 24V Dual Channel Audio Stereo AMP"
I got from amazon. but it has quite a bit of noise when no audio is playing. I can hear it from my sitting position of 1 to 3 feet from the speakers on either side of my computer monitor.
I dont want to just move the speakers farther away because then i'd need to turn the volume up more to compensate and the noise/hiss/fuzz would be back again
 
#2
can I ask about the sensitivity of your speakers? I had some project for a studio monitor, TPA3116+DSP had -104dbA S/N and I could hear the noise only from couple inch. The previous design(jbl) used STA350 from ST with -87dbA S/N and I could hear the noise from 1m or half, it was really awful, like a cassette deck from 1980 ))
 
#3
85.5 dB
but it might not be correct because I have added some 90+ or so dB super tweeters added which most of the noise comes from but I still hear some from the speakers
they are these speakers Amazon.com: Dual Electronics LU43PB 4 inch 3-Way High Performance Indoor, Outdoor & Bookshelf Studio Monitor Speakers with Swivel Brackets & 100 Watts Peak Power: Home Audio & Theater
with some 200 watt super tweeters that I put a 2 ohm resistor in series with to tame them down a little (my speakers have not very good sounding highs but these added super tweeters make it sound much cleaner.)
just the noise issue bothers me.
its not a power supply noise or anything because its the same on battery or with 12v adapter.
 
#4
Ok, I think TPA3116 is good enough for your speaker just try to get better amp board implementation. In my opinion, you don't need super-duper low noise amp at all, real -102db, as claimed tpa3116.pdf, you should hear from about 3-5", depends on the ambient noise level of course. In case if you'll wish less noise, try TPA3251 IC amps or similar for less power.
 
#5
You get what you pay for - these AliBaba sellers often
-chose cheapest (fake) components whenever possible
-claim specifications they copy from component data books instead of measuring their product

Poor design increases hiss, most of the time:
1) gain setting way too high, often 36db instead of 20dB
2) potentiometer with 100kOhm instead of 10k
3) and more
These problems are not new at all and treated in several threads here.
 
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