Com-Tech 210 Minimum Power Matrix - Crown Com-Tech CT-210 Reference Manual

Com-Tech Power Amplifiers
In an effort to provide you with as much information as possible about the high power-producing capabilities of your amplifier, we
have created the following power matrices.
Minimum Guaranteed Power Specifications
Crown's minimum power specifications represent the absolute smallest amount of output power you can expect from your amplifier
when it is driven to full output under the given conditions. Some spaces in each matrix may be left blank because the same guarantee
is not provided for those conditions—however, your amplifier will perform well under all conditions listed in each matrix.
When measuring power, 0.1% THD appears to be the industry standard for distortion. Two of the maximum average power specifica-
tions shown in each minimum power matrix are measured at 0.1% THD so you can easily compare Crown specifications to those of
other manufacturers. But this high level of distortion actually allows for some clipping which is undesirable. Because of this, a maxi-
mum average power specification at 0.05% THD is included in each minimum power matrix which represents non-clipped conditions.
Although most manufacturers do not give you power specifications at 0.05% THD, we encourage them to provide these specifica-
tions so you will have a more realistic representation of the way amplifiers should be used in the real world—without a clipped output
signal.
Many manufacturers publish power specs with a tolerance of ±1 dB or worse. This means their amplifier can deviate more than 20%
in output! A 100 watt amplifier would meet their specification if it only produced 79.4 watts. Other manufacturers qualify their specs by
Com-Tech 210 – Minimum Guaranteed Power (Watts)
Dual/Mono At 0.1% THD
Mode
4
Dual
8
(both channels
driven)
50 (70V)
8
Bridge-Mono
16
(balanced output)
100 (140V)
2
Parallel-Mono
4
25 (70V)
4
Dual
8
(both channels
driven)
50 (70V)
8
Bridge-Mono
16
(balanced output)
100 (140V)
2
Parallel-Mono 4
25 (70V)
4
Dual
8
(both channels
driven)
50 (70V)
8
Bridge-Mono
16
(balanced output)
100 (140V)
2
Parallel-Mono 4
25 (70V)
Fig. 6.1 Com-Tech 210 Minimum Power Matrix
Reference Manual
Crown specifications are guaranteed for three years.
Maximum Average
At 0.1% THD At 0.05% THD
(See note 1) (See note 2) (See note 3)
1 kHz 20Hz-20kHz 1 kHz
150 135 145
110 105 105
110 105 110
300 270 295
220 210 215
205 200 205
295 290
215 210
210 205
145 135 145
110 105 110
105 95 105
290 265 285
220 210 220
205 195 205
290 285
215 210
210 205
150 140 150
115 110 115
105 100 105
300 275 295
230 220 225
215 200 210
300 300
225 225
215 215
saying they are "typical, " "subject to manufac-
turing tolerances, " "single channel driven" or
that they are specified with "fuses bypassed. "
FTC Continuous Average
Each of these statements effectively removes
At 0.1% THD
any performance guarantee. In fact, some
(See note 4)
manufacturers use these tactics to generate
large power numbers, and they don't even print
1 kHz 20Hz-20kHz
a disclaimer. We take a different approach at
140 125
Crown—our amplifiers are guaranteed to meet
105 100
or exceed their specifications for three years.
Further, because our published specs are set
110 105
below our "in-house" measurements, you can
270 250
expect every Crown amplifier to exceed its pub-
210 205
lished minimum power specs. We believe you
should get what you pay for.
205 200
275
Minimum Power Notes:
All minimum power specifications are based on
215
0.5% regulated AC mains with THD of less than
205
1.0% and an ambient room temperature of 70° F
135 125
(21° C). Standard EIA power (RS-490) is not shown
here because it is identical to FTC Continuous Av-
110 105
erage Power.
100 95
1. A 1 kHz sine wave is presented to the amplifier
275 250
and the output monitored for nonlinear distor-
tion. The level is increased until THD reaches
215 205
0.1%. At this point, average power per channel
205 190
is reported.
270
2. A sine wave is presented to the amplifier over
210
the range from 20 Hz to 20 kHz and the output
monitored for nonlinear distortion. The level at
205
each frequency is increased until THD reaches
140 130
0.1%. At this point, average power per channel
is reported.
110 105
3. A 1 kHz sine wave is presented to the amplifier
105 95
and the output monitored for nonlinear distor-
280 260
tion. The level is increased until THD reaches
225 215
0.05%. At this point, average power per chan-
nel is reported.
210 195
4. Continuous power in the context of Federal
275
Trade Commission testing is understood to be
220
a minimum of five minutes of operation. Har-
monic distortion is measured as the RMS sum
210
total and given as a percentage of the funda-
mental output voltage. This applies for all watt-
ages greater than 0.25 watts.
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