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D Series Power Amplifiers
page 16
Operation Manual
D-45
Configuration and Load
(ohms)
FTC Continuous
Average Power at 0.1% THD
(See note 1)
Max. Aver-
age Power at
0.1% THD
(See note 2)
Single-Cycle Tone Burst
Watts at < 0.05% THD
(See note 3)
40 mS Tone Burst
Watts at < 0.05% THD
(See note 4)
EIA Watts at
1% THD
(See note 5)
20Hz-20kHz
1 kHz 1 kHz 20 Hz 50 Hz 1 kHz 20 Hz 50 Hz 1 kHz 1 kHz
Dual
(both channels
driven)
4 3540507555606035
820252525303540404025
16 20 20 20 20 20 20 20 20 20 20
Bridge-Mono
(balanced output
)
8 70 85 105 145 85 85 85 70
16 40 50 50 50 60 70 50 50 55 50
6 Specifications
D-75A
Configuration and Load
(ohms)
FTC Continuous
Average Power at 0.1% THD
(See note 1)
Max. Aver-
age Power at
0.1% THD
(See note 2)
Single-Cycle Tone Burst
Watts at < 0.05% THD
(See note 3)
40 mS Tone Burst
Watts at < 0.05% THD
(See note 4)
EIA Watts at
1% THD
(See note 5)
20Hz-20kHz
1 kHz 1 kHz 20 Hz 50 Hz 1 kHz 20 Hz 50 Hz 1 kHz 1 kHz
Dual
(both channels
driven)
4 45 50 55 65 85 120 65 70 70 55
835404045506045454540
16 25 25 25 25 30 30 25 25 25 25
Bridge-Mono
(balanced output)
8 95 105 110 140 165 235 140 140 140 105
16 70 75 80 90 100 130 90 90 95 75
Figure 6.1 D-45 Power Matrix
Figure 6.2 D-75A Power Matrix
Notes:
All power matrix specifications are based on a 0.1% regulated 120 VAC, 60 Hz power mains and an ambient room temperature of 70° F (21° C).
1. Continuous power in the context of Federal Trade Commission testing is understood to be a minimum of five minutes of operation. Harmonic distortion is measured at the RMS sum total as a percentage of the fundamental output voltage. This applies for
all wattages greater than 0.25 watts.
2. A 1 kHz sine wave is presented to the amplifier and the output monitored for nonlinear distortion. The level is increased until the THD reaches 0.1%. At this level the average power per channel is reported.
3. A single cycle sine wave is presented to the amplifier and monitored for nonlinear distortion. The average power during the burst is reported. Loudspeakers must be able to withstand this level if they are to be safely used with this amplifier.
4. A 40 millisecond burst or a two cycle sine wave (whichever is of greater duration) is used and the power computed as the average power during the burst. The duty cycle of this test is 10 percent. This power level is a measure of how loud an amplifier is
as perceived by the human ear.
5. EIA standard RS-490 (both channels driven).