Сорри за незнание

Усилитель мощности NAD C270. И параметры указанные мной его:
Power Amplifier Section  
Continuous ave. power out into 8 ohms1- 120W (20.8dBW)  

Rated distortion (THD 20Hz-20kHz)  - 0.03%  

Clipping power (max continuous power/channel) -  140W  

IHF dynamic headroom at 8 ohms - 2.4 dB  

IHF dynamic power (Max short term pow./chan.)  
-8 ohms  210W (23.2dBW)  
-4 ohms  340W (25.3dBW)  
-2 ohms  450W (26.5dBW)  

Damping factor (ref 8 ohms 50 Hz)   >150  

Frequency response   20Hz-20kHz  ±0.3dB
 3Hz/70kHz  -3dB  

Input impendance R and C -  20k ohms / 300pF  

Input sensitivity (for rated output into 8 ohms)  - 1.1V  

Voltage gain   x 28.3 (29dB)  

Signal/noise ratio, A weighted   ref. 1W -  100dB  

ref. rated power  - 120dB