Crown Audio STUDIO AMPLIFIER owner manual Maximum Power Specifications, Page

Studio Reference I & II Professional Studio Amplifiers

Maximum Power Specifications

Crown’s maximum power specifications represent the largest amount of output power you can expect from your ampli- fier when it is driven to full output under the given conditions. These specifications can be used to prevent loudspeaker and hearing damage.

The maximum power matrices include specifications for single cycle and 40 millisecond burst sine waves. Burst signals act like large transient peaks that are present in common source signals. Loudspeakers can respond to a single cycle burst, so the single cycle burst specifications should be used to help you protect your loudspeakers. In contrast, a 40 millisecond burst represents the typical response time of the human ear. Your ear will not respond to the entire dynamic change of a burst that lasts less than 40 milliseconds.

The burst power specifications are provided at 0.05% THD which is a practical low distortion condition. Operating the amplifier at levels higher than 0.05% THD can result in output power levels that are higher than those listed in the maximum power matrices.

Studio Reference I – Maximum Power (Watts)

Mains		(Ohms)	Single Cycle Tone Burst				40 Millisecond Tone Burst
	Stereo/Mono			0.05% Distortion + Noise				0.05% Distortion + Noise
	Mode				(See note 1)				(See note 2)
AC		Load
			50 Hz		1 kHz	7 kHz	50 Hz		1 kHz	7 kHz
	Stereo	4	1,435		2,180	2,030	1,295		1,220	1,220
Hz	(both channels
		8	900		1,165	1,120	835		820	830
	driven)
6 0	Bridge-Mono	8	2,855		4,355	4,080	2,635		2,425	2,400
VAC,
	(balanced output)	16	1,780		2,345	2,215	1,695		1,635	1,650
120	Parallel-Mono	2	2,820		4,380	4,075	2,605		2,420	2,395
		4	1,795		2,340	2,230	1,700		1,620	1,650
	Stereo	4	1,380		2,150	2,015	1,260		1,135	1,135
	(both channels
Hz		8	900		1,155	1,100	820		780	790
	driven)
50	Bridge-Mono	8	2,780		4,285	4,020	2,595		2,260	2,235
VAC,
	(balanced output)	16	1,740		2,320	2,195	1,600		1,555	1,570
100
	Parallel-Mono	2	2,780		4,325	3,985	2,455		2,250	2,250
		4	1,780		2,320	2,190	1,620		1,545	1,575
	Stereo	4	1,470		2,220	2,065	1,370		1,290	1,275
	(both channels
Hz		8	930		1,190	1,135	880		850	860
	driven)
50	Bridge-Mono	8	2,945		4,360	4,090	2,695		2,560	2,505
VAC,
	(balanced output)	16	1,830		2,360	2,250	1,750		1,685	1,705
240
	Parallel-Mono	2	2,970		4,415	4,100	2,715		2,525	2,550
		4	1,810		2,355	2,240	1,745		1,685	1,700

Fig. 6.3 Studio Reference I Maximum Power Matrix

Maximum Power Notes:

All maximum power specifica- tions are based on 0.5% regu- lated AC mains with THD of less than 1.0% and an ambi- ent room temperature of 70° F (21° C). Although it is an un- usual condition, your amplifier can function well with AC mains voltages up to 10% over the specified line voltage. With overvoltage conditions, your amplifier may be capable of delivering instantaneous power levels up to 20% greater than the specifications in the matrix.

1.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 ampli- fier.

2.A 40 millisecond sine wave burst (10 percent duty cycle) is presented to the amplifier and monitored for nonlinear distortion. Average power during the burst is reported. This power level is a mea- surement of the amplifier’s maximum transient power that can be perceived by the human ear.

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