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Class D Switching Power Amplifiers and Power D/A conversion

Are there powerful TDA7498E amps without audible hiss?
Are there powerful TDA7498E amps without audible hiss?
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Old 28th September 2019, 08:05 AM   #1
CowCat is offline CowCat
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Default Are there powerful class-D amps without audible noise?

I want an affordable powerful class-D amp without audible noise.

Because I'm going to listen in front of a desk, reducing noise is important.

I looked into TDA7498E because it is powerful.
But, it seems to be affected by noise issue.
Reportedly, some TDA7498E amps produce hiss at 13~14khz which many humans may not be able to hear.

Do you know any affordable powerful class-D amp without audible noise?

Last edited by CowCat; 28th September 2019 at 08:38 AM.
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Old 28th September 2019, 08:36 AM   #2
FauxFrench is online now FauxFrench  France
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Location: The mountains, calm and quiet.
I hear no such noise but I have an age where higher frequencies may be a problem to hear. My dog refuses to comment on such uninteresting issues when we could spend time playing with the ball instead.
Could someone eventually check with a microphone and an oscilloscope?
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Old 28th September 2019, 08:42 AM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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If it is a harmonic of the switching frequency, bearing in mine the maximum noise figure is 400uV at full power which is not audible, simply improve the filter to the loudspeakers. Move the frequency and the harmonics will no longer be there.
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Old 28th September 2019, 11:10 AM   #4
CowCat is offline CowCat
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What about plugging a 22V adapter into Nobsound dual TPA3116 amp?

Last edited by CowCat; 28th September 2019 at 11:19 AM.
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Old 28th September 2019, 11:17 AM   #5
amplidude is offline amplidude  Denmark
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Quote:
Originally Posted by CowCat View Post
I want an affordable powerful class-D amp without audible noise.

Because I'm going to listen in front of a desk, reducing noise is important.

I looked into TDA7498E because it is powerful.
But, it seems to be affected by noise issue.
Reportedly, some TDA7498E amps produce hiss at 13~14khz which many humans may not be able to hear.

Do you know any affordable powerful class-D amp without audible noise?
Think it depends on your speakers, if they are full blown horn loaded + 100db you might hear a faint hiss in tweeter
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Old 28th September 2019, 11:39 AM   #6
CowCat is offline CowCat
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Quote:
Originally Posted by amplidude View Post
Think it depends on your speakers, if they are full blown horn loaded + 100db you might hear a faint hiss in tweeter
My speakers are Eltax Monitor 1 which has sensitivity of 87dB and impedance of 4~8 ohm.

Currently, I'm considering Nobsound dual TPA3116, TDA7498E amps, and chinese no-name TPA3255 amps.
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Old 30th September 2019, 11:46 PM   #7
Mark Tillotson is offline Mark Tillotson
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The 7498 boards I've seen can come with cheapo opamp front-end - is this the case with yours?
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Old 30th September 2019, 11:49 PM   #8
CowCat is offline CowCat
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Quote:
Originally Posted by Mark Tillotson View Post
The 7498 boards I've seen can come with cheapo opamp front-end - is this the case with yours?
No, there is no case for me because I'm going to order a chinese TPA3251 amp.
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