Page 39
Com-Tech Power Amplifiers
Reference Manual
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 burst power specifications are provided at 0.05% THD which is a practical low distortion condition. Operating the ampli-
fier at levels higher than 0.05% THD can result in output power levels that are higher than those listed in the maximum power
matrices.
Fig. 6.5 Com-Tech 210 Maximum Power Matrix
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 volt-
age. With overvoltage condi-
tions, your amplifier may be
capable of delivering instan-
taneous power levels up to
20% greater than the specifi-
cations in the matrix.
1. A single cycle sine wave
is presented to the ampli-
fier and monitored for non-
linear distortion. The aver-
age power during the burst
is reported. Loudspeakers
must be able to withstand
this level if they are to be
safely used with this am-
plifier.
2. A 40 millisecond sine wave
burst (10 percent duty
cycle) is presented to the
amplifier and monitored for
nonlinear distortion. Aver-
age power during the
burst is reported. This
power level is a measure-
ment of the amplifier’s
maximum transient power
that can be perceived by
the human ear.
50 (70V)
4
Dual
(both channels
driven)
Bridge-Mono
(balanced output)
Parallel-Mono
2
100 (140V)
8
25 (70V)
8
4
16
Dual
(both channels
driven)
Bridge-Mono
(balanced output)
Parallel-Mono
Com-Tech 210 –
Maximum Power (Watts)
Dual/Mono
Mode
40 Millisecond Tone Burst
At 0.05% THD
(See note 2)
Single Cycle Tone Burst
At less than 0.05% THD
(See note 1)
50 Hz
1 kHz
Load in Ohms
(Constant Voltage)
20 Hz
50 Hz
1 kHz
7 kHz
7 kHz
AC Mains
120 VAC, 60 Hz
100/120 VAC, 50/60 Hz
Dual
(both channels
driven)
Bridge-Mono
(balanced output)
Parallel-Mono
220/240 VAC, 50/60 Hz
50 (70V)
4
2
100 (140V)
8
25 (70V)
8
4
16
50 (70V)
4
2
100 (140V)
8
25 (70V)
8
4
16
170
130
130
355
255
255
345
255
255
165
125
140
325
250
275
325
245
275
165
130
140
330
250
305
315
250
280
205
145
135
400
280
270
405
280
270
220
155
150
435
300
295
425
305
295
225
155
150
440
310
310
425
305
295
275
165
140
535
325
275
520
315
280
310
185
150
600
360
305
580
355
305
315
185
155
625
370
315
595
365
305
275
165
135
530
320
265
520
315
265
305
180
145
605
360
290
585
355
290
310
185
150
625
370
300
590
360
295
175
130
130
345
250
255
345
245
255
190
135
140
380
265
275
360
265
275
190
140
140
375
270
310
370
270
280
155
115
125
310
225
250
300
220
245
165
125
135
325
245
265
310
235
265
165
125
135
325
245
310
315
240
270
165
120
130
325
240
255
315
230
255
175
130
140
345
255
275
335
250
275
175
130
140
345
260
300
335
255
280
