Digital Audio and Amplifier Noise Floor Comparison - Is 16bit/44.1kHz All We Need ???

[Panelhead]

On 6/20/2019 at 11:10 AM, psjug said:

Just out of curiosity, have you or @Shadders seen measurements of finished amplifiers made from these kinds of kits?  I'm not sure I've seen measurements of any amplifier other than the AHB2 that meets the 96dB THD+N at 1W.  Maybe nCore is right on the edge of meeting this with a 22KHz filter.  Maybe there are a few others, but I bet they are rare.

  This is a measurement performed with an AP analyzer on my amp. It is dead quiet connected to 105 dB efficient Klipsch La Scala II speakers. 

Noise.pdf

[Panelhead]

  I plan on rerunning analysis on my current amp. Noise floor on My_Ref Evo Rev A does not quite match AHB2. But slaughters most of the expensive amps I have seen tested in Stereophile. Many have a baseline and power supply artifacts 20 dB higher. 

  Since changing to high efficiency horns I am using a similar design with much lower gain. Hope to get test setup running soon. 

  Plus want to test at 10 mW, 100 mW, and 1 watt. With 105 dB 3 way horns and an active sub,  100 mW is very loud. The 5 and 18 watt output RTA plots are not representative of normal operation.

  You can build your own.