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EN
EN
TD-000367-00-A
Heat Loss Charts
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. 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.
BTU/hr
kcal/hr
Idle
CXD 4.3
225
57
CXD 4.5
286
72
Load per Channel
8
Ω
4
Ω
2
Ω
25V-70V-100V
BTU/hr
kcal/hr
BTU/hr
kcal/hr
BTU/hr
kcal/hr
BTU/hr
kcal/hr
1/8th Power
CXD 4.3
684
172
794
200
1040
262
794
200
CXD 4.5
811
204
1144
288
1124
283
1144
288
1/3rd Power
CXD 4.3
983
248
1261
318
1869
471
1261
318
CXD 4.5
881
222
1708
430
1737
438
1708
430
Full Power
CXD 4.3
2498
629
2925
737
4198
1058
2925
737
CXD 4.5
3116
785
5318
1340
4208
1060
5318
1340
Idle
Thermal loss at idle or with very low signal level.
1/8 Power
Thermal loss at 1/8 of full power is measured with pink noise. It approximates operating with music or voice with light clipping and represents the
amplifier's typical "clean" maximum level, without audible clipping. Use these figures for typical maximum level operation.
1/3 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.
Full Power
Thermal loss at full power is measured with a 1 kHz sine wave. However, it does not represent any real-world operating condition.