December
2010
Amplifier Heat Loss
Heat losses are the thermal emissions from an amplifier while it is operating. It comes from dissipated waste power—i.e., real AC power in minus audio power out. Measurements are provided for various loads at idle, 1/8 of average full power, 1/3 of average
full power, and full power, with all channels driven simultaneously. For typical usage, use the idle and 1/8 power figures. Where an asterisk (*) appears, the data was not available at press time. The designation "na" means not applicable to the particular
amplifier model and "nr" means the model is not rated for the particular load. This data is measured from representative samples; due to production tolerances, actual heat emissions may vary slightly from one unit to another. Bridged mono into 8 ohms is
equivalent to 4 ohms per channel; into 4 ohms is equivalent to 2 ohms per channel.
1/3 Power
Full Power
Thermal loss at
idle or with very
low signal level.
Not all models
were tested.
Idle
Thermal loss at 1/8 of full power is measured with pink noise. It
approximates operating with music or voice with light clipping and
repesents the amplifier's typical "clean" maximum level, without
audible clipping. Use these figures for typical maximum level
operation.
1/8 Power
Thermal loss at 1/3 of full power is measured with pink noise. It
approximates operating with music or voice with very heavy clipping
and a very compressed dynamic range.
Thermal loss at full power is measured with a 1 kHz sine wave.
However, it does not represent any real-world operating condition.
BTU/hr kcal/hr
BTU/hr kcal/hr BTU/hr kcal/hr BTU/hr kcal/hr BTU/hr kcal/hr
BTU/hr kcal/hr BTUl/hr kcal/hr BTU/hr kcal/hr BTU/hr kcal/hr
Load per channel ->
Model
Current models
CX302
CX502
CX702
CX902
CX1102
CX302V
CX602V
CX1202V
CX254
CX404
CX204V
CX168
CX108V
109
109
143
171
195
201
164
201
116
119
140
102
89
27
27
36
43
49
51
41
51
29
30
35
26
22
8W
567
928
676
901
1195
nr
1785
1222
1137
1570
nr
1126
nr
4W
143
234
170
227
301
nr
450
308
287
396
nr
284
nr
993
1536
1311
1529
2133
nr
nr
2177
1809
2560
nr
2014
nr
2W
250
387
330
385
538
nr
nr
549
456
645
nr
508
nr
1741
2560
2253
2986
3976
nr
nr
nr
3085
nr
nr
nr
nr
25V-70V-100V
439
645
568
752
1002
nr
nr
nr
777
nr
nr
nr
nr
na
na
na
na
na
1123
1785
2177
na
na
1741
na
1150
na
na
na
na
na
283
450
549
na
na
439
na
290
8W
724
1113
1085
1410
1765
nr
2263
1468
1451
2143
nr
1526
nr
4W
182
280
273
355
445
nr
570
370
366
540
nr
385
nr
1246
1911
1911
2560
2331
nr
nr
2604
2379
3369
nr
2512
nr
2W
314
482
482
645
587
nr
nr
656
600
849
nr
633
nr
2253
3314
3191
4266
4584
nr
nr
nr
4437
nr
nr
nr
nr
25V-70V-100V
568
835
804
1075
1155
nr
nr
nr
1118
nr
nr
nr
nr
na
na
na
na
na
1294
2263
2604
na
na
2321
na
1601
na
na
na
na
na
326
570
656
na
na
585
na
403
8W
4W
2W
25V-70V-
BTU/hr kcal/hr BTU/hr kcal/hr BTU/hr kcal/hr BTU/hr kcal/hr
717
1031
1246
1707
2048
nr
2055
1945
1341
1973
nr
1491
nr
181
260
314
430
516
nr
518
490
338
497
nr
376
nr
1296
2014
2321
3072
3891
nr
nr
4232
2236
4061
nr
3328
nr
327
508
585
774
981
nr
nr
1066
563
1023
nr
839
nr
2423
4096
4608
5836
8533
nr
nr
nr
5266
nr
nr
nr
nr
611
1032
1161
1471
2150
nr
nr
nr
1327
nr
nr
nr
nr
na
na
na
na
na
1079
2055
4232
na
na
1980
na
1160
na
na
na
na
na
272
518
1066
na
na
499
na
292