Audio
Here is a comparision between some amplifier data
More data can be found by follwoing the link for each unit.
  THD IMD DFD S/N
Measuring limits for the Rohde & Schwarz UPL02-B1 -122 dB
0,00008 %		 -103 dB
0,00071 %		 -132 dB
0,000025 %		 -140 dB
Power amplifiers
    THD IMD DFD S/N
AV 3886 6 ch power amp
(Homebrew)
1 W -87 dB
0,0045 %		 -71 dB
0,028 %		 -96 dB
0,0016 %		  
10 W -87 dB
0,0045 %		 -70 dB
0,032 %		 -93 dB
0,0022 %		  

Dynaco Stereo 70

 1 W -79 dB
0,011 %		 -56 dB
0,16 %		 -63 dB
0,07 %		  
10 W -60 dB
0,01 %		 -45 dB
0,56 %		 -56 dB
0,16 %		 -95 dB
25 W -52 dB
0,25 %		 -40 dB
1 %		 -46 dB
0,5 %		  

Dynaco Stereo 120

 1 W -66 dB
0,05 %		 -52 dB
0,25 %		 -70 dB
0,032 %		 -85 dB
10 W -69 dB
0,035 %		 -51 dB
0,28 %		 -67 dB
0,044 %		  
50 W -63 dB
0,07 %		 -47 dB
0,44 %		 -  
 
Preamplifiers
  THD IMD DFD S/N
National LM833N - RIAA preamp only

RIAA

 -98 dB
0.0013 %		 -93 dB
0,0022 %		 -90 dB
0,0032 %		 <-80 dB
Creative DDTS-100 -93 dB
0,0022 %		 -76 dB
0,016 %		 -105 dB
0,00056%		  
Dynaco PAS-3 Line -84 dB
0,006 %		 -75 dB
0,018 %		 - 87 dB
0,0045 %		  
RIAA -75 dB
0,018 %		 -67 dB
0,044 %		 -72 dB
0,025 %		 -68 dB
Dynaco PAT-4 Line -76 dB
0,016 %		 -65 dB
0,056 %		 -78 dB
0,013 %		 -90dB
RIAA -78 dB
0,013 %		 -67 dB
0,044 %		 -77 dB
0,014 %		 -75 dB
THD = Total Harmonic Distortion, measured with 1 kHz
IMD = Intermodulation distortion, measured with 60 Hz and 1 kHz in proportion 4:1
DFD = Differential Modulation Distortion, measured with 9 kHz and 10 kHz in proportion 1:1
 
Updated:  25 januari 2009