Power Base-1 Maximum Power Matrix - Crown POWER BASE 1 Reference Manual

Power Base Series Power Amplifiers
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.
Power Base-1 – Maximum Power (Watts)
Single Cycle Tone Burst
At less than 0.05% THD
Stereo-Mono
Mode
50 Hz
Stereo
4 325
(both channels
8 265
driven)
8
630
Bridge-Mono
(balanced output)
16 540
2 635
Parallel-Mono
4 530
Stereo
4
325
(both channels
8
290
driven)
8
640
Bridge-Mono
(balanced output)
16
580
2 620
Parallel-Mono
4
580
Fig. 4.4 Power Base-1 Maximum Power Matrix
40 Millisecond Tone Burst
0.05% THD + Noise
(See note 1)
1 kHz 7 kHz 50 Hz
335
335 315
310
300 230
640
620 600
630
610 470
645
640 620
615
600 465
330
330 320
345
335 260
650
670 635
690
670 520
625
625 615
690
670 515
(See note 2)
1 kHz 7 kHz
295 310
230
220
565 580
440 455
580 605
450
430
330
315
235 250
625 655
470 495
625
615
490
475
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