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.
International Units 120 VAC, 60 Hz Units AC Mains
(Ohms) | ||
| ||
Mode | Load | |
| ||
Stereo |
| |
4 | ||
(both channels | 8 | |
driven) | ||
8 | ||
| ||
(balanced output) | 16 | |
2 | ||
4 | ||
| ||
Stereo | 4 | |
(both channels | 8 | |
driven) | ||
8 | ||
| ||
(balanced output) | 16 | |
2 | ||
4 | ||
|
Power Base-1 – Maximum Power (Watts)
Single Cycle Tone Burst | 40 Millisecond Tone Burst |
| |||
| At less than 0.05% THD |
| 0.05% THD + Noise |
| |
| (See note 1) |
|
| (See note 2) |
|
50 Hz | 1 kHz | 7 kHz | 50 Hz | 1 kHz | 7 kHz |
325 | 335 | 335 | 315 | 295 | 310 |
265 | 310 | 300 | 230 | 220 | 230 |
630 | 640 | 620 | 600 | 565 | 580 |
540 | 630 | 610 | 470 | 440 | 455 |
635 | 645 | 640 | 620 | 580 | 605 |
530 | 615 | 600 | 465 | 430 | 450 |
325 | 330 | 330 | 320 | 315 | 330 |
290 | 345 | 335 | 260 | 235 | 250 |
640 | 650 | 670 | 635 | 625 | 655 |
580 | 690 | 670 | 520 | 470 | 495 |
620 | 625 | 625 | 615 | 615 | 625 |
580 | 690 | 670 | 515 | 475 | 490 |
Fig. 4.4 Power Base-1 Maximum Power Matrix
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