Справочное Руководство для Crown studio reference i

Page 31

Studio Reference 

IIIII & II

  Professional Studio Amplifiers

Fig. 6.3  Studio Reference 

I Maximum Power Matrix

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.

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.

8

Studio Reference I – 

(balanced output)

16

4

Single Cycle Tone Burst

Load (Ohms)

0.05% Distortion + Noise

(See note 1)

50 Hz

1,435

900

2,855

1,780

2,820

1,795

4

2

8

8

16

4

1,380

900

2,780

1,740

2,780

1,780

1 kHz

2,180

1,165

4,355

2,345

4,380

2,340

2,150

1,155

4,285

2,320

4,325

2,320

7 kHz

2,030

1,120

4,080

2,215

4,075

2,230

2,015

1,100

4,020

2,195

3,985

2,190

4

2

8

(balanced output)

40 Millisecond Tone Burst

50 Hz

0.05% Distortion + Noise

(See note 2)

1,295

835

2,635

1,695

2,605

1,700

1 kHz

1,220

820

2,425

1,635

2,420

1,620

1,260

820

2,595

1,600

2,455

1,620

1,135

780

2,260

1,555

2,250

1,545

7 kHz

1,220

830

2,400

1,650

2,395

1,650

1,135

790

2,235

1,570

2,250

1,575

(both channels

driven)

(both channels

driven)

8

16

4

1,470

930

2,945

1,830

2,970

1,810

2,220

1,190

4,360

2,360

4,415

2,355

2,065

1,135

4,090

2,250

4,100

2,240

4

2

8

(balanced output)

1,370

880

2,695

1,750

2,715

1,745

1,290

850

2,560

1,685

2,525

1,685

1,275

860

2,505

1,705

2,550

1,700

(both channels

driven)