Com-Tech 810 and 1610 Amplifier Service Manual
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2-1
Rev. 0
The following specifications apply to all models in Dual mode
with 8-ohm loads and an input sensitivity of 26 dB unless
otherwise specified.
MAP at 1 kHz: This term refers to maximum average power in
watts at 1 kHz with 0.1% THD.
Full Bandwidth Power: This term refers to maximum average
power in watts from 20 Hz to 20 kHz with 0.1% THD.
120 VAC, 60 Hz Units: These North American units have dedi-
cated transformers for 120 VAC, 60 Hz power mains.
100/120 VAC Units: These units have two-tap transformers
that accept a 50- or 60-Hz AC line, and can be configured
for 100 or 120 VAC mains.
220/240 VAC Units: These units have two-tap transformers
that accept a 50- or 60-Hz AC line, and can be configured
for 220 or 240 VAC mains.
2.1 Performance
Frequency Response: ±0.1 dB from 20 Hz to 20 kHz at 1
Watt (See Figure 2.1).
Phase Response: ±10 degrees from 10 Hz to 20 kHz at 1
Watt (See Figure 2.4).
Hum and Noise: A-weighted, 105 dB below full bandwidth
power; No weighting, 100 dB below full bandwidth power.
Total Harmonic Distortion (THD): Less than 0.05% at full power
from 20 Hz to 1 kHz increasing linearly to 0.1% at 20 kHz.
Intermodulation Distortion (IMD): (60 Hz and 7 kHz 4:1) Less
than 0.05% from -35 dB to full power bandwidth.
Damping Factor: Greater than 1000 from 10 Hz to 400 Hz
(See Figure 2.2).
Crosstalk: Greater than 70 dB down at 10 kHz. (See Figure
2.5).
Common Mode Rejection Ration (CMRR): Better than 70 dB.
Slew Rate: Greater than 17 volts per microsecond.
Voltage Gain: (At the maximum level setting) 20:1 ±3% or 26
dB ±0.25 dB. 90:1 ±12% or 39 dB ±1 dB with the input
sensitivity set to 0.775 volts for 70 volt output. The following
voltage gain specifications are for units with the input sensi-
tivity set to 0.775 volts for 8/4 ohm output:
Com-Tech 810:
64:1 ±12% or 36 dB ±1 dB.
Com-Tech 1610
: 85:1 ±12% or 39 dB ±1 dB.
2.2 Power
Output Power: See the minimum Guaranteed Power table in
Figures 2.6-7 for the output power specifications under a
variety of conditions.
It is extremely important to supply the amplifier with ad-
equate AC power. Power amplifiers cannot add power–they
need the required voltage and current to deliver the
undistorted rated wattages you expect.
Load Impedance: Safe with all types of loads. With 8/4 ohm
output, all
Com-Techs
are rated for 4 to 8 ohms in Dual
mode, 8 to 16 ohms in Bridge-Mono mode, and 2 to 4 ohms
in Parallel-Mono mode. With a 70 volt output, rated loads
vary among the different models for each dual/mono mode
(see the power matrices that follow).
AC Power Requirements: All units require less than 90 watts
at idle. See Section 3 for detailed information on AC power
requirements and thermal dissipation.
Low-Voltage Power Supply: ±15 VDC regulated supplies are
provided by a winding on the power transformer.
Power Cord: An appropriate AC line cord is provided with a
nominal cable length of 3 feet.
2.3 Controls
Enable: A front panel rocker switch used to turn the amplifier
on and off, and to enable the remote feature.
Input Attenuation: A detented 21-position back panel Input
Attenuation control for each channel.
Output Mode: A back panel switch for each channel used to
select 8/4-ohm or 70-volt output.
Dual/Mono: A 3-position back panel switch used to select
Dual, Bridge-Mono or Parallel-Mono operation.
Reset: A back panel push button used to reset the amplifier's
AC mains breaker.
Input Sensitivity: A three-position switch inside the
P.I.P.
com-
partment used to select an input sensitivity for both chan-
nels: 0.775 volts for MAP at 1 kHz in 8/4 ohm mode, 0.775
volts for MAP at 1 kHz in 70-volt mode, or a voltage gain of
26 dB.
2 Specifications
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