Budget power/stepped amplifiers?

[mdsimon2]

I have my ears?

AIYIMA A07's gain is reportedly 21.5dB. If I set DAC volume to -21.5dB, net gain would be 0dB. If I set DAC voulme to -91.5dB, the net gain would be -70dB.

At least, my LED lights reduced differential-mode noise by a ten~hundred fold, compared to compact fluorescent lights.
Are audio gears affected a lot by common-mode noise if they are almost immune to differential-mode noise?

You should measure the gain, I bet it is over 30 dB with the knob maxed.

Michael

 

[Deleted member 58865]

You should measure the gain, I bet it is over 30 dB with the knob maxed.

How can I measure that?

 

[mdsimon2]

How can I measure that?

Topping PA5 Review (Amplifier)

Wow just got mine hooked up to my 1979 B&W 801f , the first model with 12 in woofers and I believe 86 ish sensitivity. gustard x16 dac streaming tidal only. room 14x14 9 foot ceilings 5 windows and a flatscreen in the room. So I pull down the shade to soften things a bit. JUST FOR LAUGHS…. I...

www.audiosciencereview.com

Michael

 

[Zek]

AIYIMA A07's gain is reportedly 21.5dB. If I set DAC volume to -21.5dB, net gain would be 0dB.

You got it all mixed up. Dac volume has nothing in common with the gain of the amplifier.
The volume value on the DAC is only a relative ratio for that particular device and does not represent any actual measured reference value.

net gain would be 0dB.

Gain cannot be 0. If gain were 0, then you would not hear anything from the speakers.

 

[solderdude]

At least, my LED lights reduced differential-mode noise by a ten~hundred fold, compared to compact fluorescent lights.

Not of any audible concern though.

Are audio gears affected a lot by common-mode noise if they are almost immune to differential-mode noise?

Some are, totally depends on the schematic and above all PCB/wiring layout.

The best way to reduce noise is to eliminate a lot of it at the source without any filter.

Yes, most people do not realize this.