Power Base Series; Maximum Power Specifications; Maximum Power Notes:- Page 17

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 Mains

120 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