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Power Base Series Power Amplifiers
Page 17
Maximum Power Specifications
Crown’s maximum power specifications represent the largest amount of output power you can expect from your amplifier 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 specifications are provided at 0.05% THD because this represents a low distortion condition. To help you operate your amplifier within
these tolerances, Crown’s premium amplifiers include an input/output comparator that shows when the amplifier has exceeded 0.05% THD.
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.
Maximum Power Notes:
All maximum power specifications are based on 0.1% regulated AC mains and an ambient room temperature of 70° F (21° C). A 100V, 50Hz model was used
because of its higher current demand. Although it is an unusual 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 amplifier.
2. A 40 millisecond sine wave burst (10 percent duty cycle) is presented to the amplifier and monitored for nonlinear distortion. The average power during the
burst is reported. This power level is a measurement of the amplifier’s maximum transient power that can be perceived by the human ear.
8
Power Base-1 – Maximum Power (Watts)
Stereo-Mono
Mode
Stereo
(both channels
driven)
Bridge-Mono
(balanced output)
Parallel-Mono
16
4
40 Millisecond Tone Burst
0.05% THD + Noise
(See note 2)
7 kHz 50 Hz
315
230
600
470
620
465
320
260
635
520
615
515
335
300
620
610
640
600
330
335
670
670
625
670
Single Cycle Tone Burst
Load (Ohms)
AC Mains120 VAC, 60 Hz Units
At less than 0.05% THD
(See note 1)
50 Hz
325
265
630
540
635
530
325
290
640
580
620
580
4
2
8
1 kHz
335
310
640
630
645
615
330
345
650
690
625
690
8
Stereo
(both channels
driven)
Bridge-Mono
(balanced output)
Parallel-Mono
16
International Units
4
2
8
4
1 kHz 7 kHz
295
220
565
440
580
430
315
235
625
470
615
475
310
230
580
455
605
450
330
250
655
495
625
490
Fig. 4.4 Power Base-1 Maximum Power Matrix