Crown Audio D-75A Configuration and Load, ohms, Specifications, D Series Power Amplifiers, D-45

D Series Power Amplifiers

6 Specifications

D-45

										Max. Aver-		Single-Cycle Tone Burst							40 mS Tone Burst				EIA Watts at
Configuration and Load						FTC Continuous				age Power at
												Watts at < 0.05% THD						Watts at < 0.05% THD					1% THD
						Average Power at 0.1% THD				0.1% THD
(ohms)						(See note 1)				(See note 2)				(See note 3)						(See note 4)			(See note 5)
						20Hz-20kHz		1 kHz		1 kHz	20 Hz			50 Hz	1 kHz		20 Hz			50 Hz	1 kHz		1 kHz
Dual	4								35		40		50		75	55			60		60	35
	8				20		25		25		25		30		35	40			40		40	25
(both channels
driven)
	16				20		20		20		20		20		20	20			20		20	20
Bridge-Mono		8							70		85		105		145	85			85		85	70
(balanced output)
		16			40		50		50		50		60		70	50			50		55	50
										Figure 6.1	D-45 Power Matrix
											D-75A
										Max. Aver-		Single-Cycle Tone Burst								40 mS Tone Burst			EIA Watts at
Configuration and Load						FTC Continuous				age Power at
												Watts at < 0.05% THD						Watts at < 0.05% THD					1% THD
						Average Power at 0.1% THD				0.1% THD
(ohms)						(See note 1)				(See note 2)				(See note 3)						(See note 4)			(See note 5)
						20Hz-20kHz		1 kHz		1 kHz	20 Hz			50 Hz	1 kHz		20 Hz			50 Hz	1 kHz		1 kHz
Dual				4		45		50		55	65			85	120		65			70	70		55
				8		35		40		40	45			50	60		45			45	45		40
(both channels
driven)
	16					25		25		25	25			30	30		25			25	25		25
Bridge-Mono			8			95		105		110	140			165	235		140			140	140		105
(balanced output)
			16			70		75		80	90			100	130		90			90	95		75

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).

page 16 Operation Manual