Performance is superb as one expects going into a test of Topping product.
So if you hear distortion there, it is in your music.
Switching to the other extreme of 32 ohm, we see the same picture:This is 5.5 watts times two! This little box is producing 11 watts of power!!! I don\'t think we have ever measured an amplifier this powerful forgetting about how low noise and distortion it is.
Switching to balanced mode, we don\'t get much more power as there is no need for more:For 50 ohm, I thought I show Topping A90 as a reference:Notice how the noise level is even lower although A90 pulls ahead with a bit more power before clipping.
Finally, channel matching is quite good although as noted, there will be unit to unit variations:.
Low and medium gains have identical performance and incredibly low noise floor with no clipping.
SINAD with is the sum of noise+distortion relative to our 1 kHz tone is essentially as good as it gets:Signal to noise ration both at unity gain and 50 mv are exceptional:The latter is now class leading:Think about it: you are getting the full dynamic range of 16 bit music when outputting just 50 millivolts! This is one quiet headphone amp considering that some of this noise is from my analyzer! You can comfortably use the A30Pro with any sensitive IEM or headphone with zero worry about background hiss or noise.
Frequency response is excellent of course:Let\'s measure power relative to noise+distortion with unbalanced load of 300 ohm:Oh wow! 0.73 watts using such a high impedance? This is wonderful as it means you don\'t need to use balanced connections to get enough power to drive high impedance and inefficient headphones.
Performance is superb as one expects going into a test of Topping product
