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able current limit which is a function of the
output signal voltage. As a result, the amplifier
can deliver the rated currents into rated loads,
but substantially limits the current into low
impedance or shorted loads (shorted output
terminals). Once the short is removed, how-
ever, the amplifier will resume normal opera-
tion.
The amplifier has protect LEDs for each chan-
nel which illuminate if the amplifier goes into
thermal protection or if an internal circuit fault
develops. The amplifier has octal accessory
sockets which will accommodate a variety of
crossover and equalizer modules, simplifying
system hookup and decreasing cost. These
electronic modules are powered from a bipolar
15-volt supply in the amplifier.
The amplifier has a 31-position detented gain
control and separate clip and protect LEDs
for each channel.
The amplifier will operate at 120 or 240 volts
50/60 Hz. A separate model is available for
100-volt, 50/60-Hz operation.
ARCHITECTS AND ENGINEERS
SPECIFICATIONS
The power amplifier shall be a dual-channel
model of solid-state design employing true
complementary-symmetry output circuitry and
capable of operating from a 100/120/200/220/
240-V, 50/60-Hz ac line. The amplifier shall
contain sensing circuitry to provide protection
for the output transistors against over-
temperature, excessive output voltage, radio-
frequency interference, shorted loads and
excessive output phase shift. The load shall
similarly be protected against infrasonic sig-
nals, startup/shutdown transients, low ac line
voltage, and dc.
Rear-mounted panel controls shall include a
two-position mode switch for selecting between
the dual monophonic mode or the bridged mono-
phonic mode. Input connections for each chan-
nel shall include an octal socket for use with
optional electronic accessory modules, a
3-pin female XLR-type connector and
1/4-inch
phone jack. Output connectors shall be 5-way
binding posts.
Front panel indicators shall include an illumi-
nated power on/off indicator, individually illumi-
nated protection-circuit-activation indicators
(Protect) and clipping indicators (Clip). Front
panel controls shall include a 31-detent gain
control for each channel and an on/off switch.
The power amplifier shall meet the following
performance criteria: Maximum input voltage:
7.75 V rms. Input voltage for rated output power
into 4 ohms: 0.775 rms. Rated output power per
channel: greater than 100 watts into 4 ohms
from 20 Hz to 20 kHz at less than 0.10% THD;
greater than 75 watts per channel into 8 ohms
from 20 Hz to 20 kHz at less than 0.05% THD;
greater than 200 watts into an 8-ohm bridged
load from 20 Hz to 20 kHz at less than 0.10%
THD with one channel driven. Voltage amplifi-
cation in dual mode: 28 dB. Hum and noise:
greater than 100 dB (A weighted) below rated
output power. Frequency response: 10 Hz to 50
kHz, +0/-“3 dB at any output power up to rated Power Cable Power
AWG DCR/ft Loss/ft Cross-Sectional DCR/meter Loss/meter
(GA) (W/ft) (watts/ft) area (mm 2) (W/m) (watts/m)
6 0.00081 0.0126 13.30 0.00264 0.0412
8 0.00121 0.0189 8.36 0.00421 0.0657
10 0.00204 0.0318 5.26 0.00669 0.1044
12 0.00324 0.0506 3.31 0.01063 0.1658
14 0.00515 0.0804 2.08 0.01691 0.2636
16 0.00819 0.1278 1.31 0.02685 0.4181
18 0.01302 0.2031 0.82 0.04289 0.6665
20 0.02070 0.3226 0.52 0.06764 1.0480
22 0.03292 0.5122 0.33 0.10658 1.6434
TABLE 1 - 7100 Power Losses in Two-Wire Speaker Cable
Enclosure:
Rack mount chassis
16-GA steel
3/16-inch 5052 aluminum alloy front panel
Shipping Weight:
9.97 kg (22.0 lb)
Net Weight:
8.16 kg (18.2 lb)
Supplied Items:
Operating instructions and service manual;
four U jumper plugs for octal sockets; one
2-A/250-V fuse for 220/240-V ac use
Optional Plug-In Accessory Modules:
APX 24-dB-per-octave Linkwitz-Riley
crossover, switch selectable on ISO one-
third-octave center frequencies from 50-
10,000 Hz; APX-2 crossover, as APX but
with external nigh-pass output for other
amplifiers; APX-200 dual-channel
equalizer for FR200 speaker system.
DESCRIPTION
The Electro-Voice 7100 stereo power amplifier
utilizes proven design concepts to provide an
ultra-reliable amplifier with virtually unmatched
performance characteristics. It achieves this
success without increased complexity or cost,
making it a real value.
Each channel delivers over 75 watts of continu-
ous average power into 8 ohms or over
100 watts into 4 ohms over the full audio fre-
quency range. In the bridge mode, the amplifier
can deliver more than 200 watts into an 8-ohm
load at less than 0.10% THD. The maximum
midband output power is 100 watts per channel
into 8 ohms and 145 watts per channel into
4 ohms at less than 1% THD. Four output
devices are utilized for a total device power
dissipation of 520 watts. Because the large
heatsink area allows more than adequate dissi-
pation, the amplifier is convection cooled and
performs in total silence.
The single rackspace (1.75 in.) chassis height
makes for convenient installation. Each chan-
nel is independently protected against exces-
sive output voltage, excessive phase shift,
radio-frequency interference, shorted loads and
overtemperature.
The load is protected against startup and shut-
down transients, DC faults, low ac voltage and
subsonic signals.
A unique current-limiting circuit was designed
specifically for the amplifier. It features a vari- Output Type,
Dual Mode: Unbalanced, each channel
Bridge Mode: Balanced
Output Devices (4 devices),
Pd
max: 130 watts
Ic: 15 A dc
Vceo: 180 V dc
Tj
max: 150 °C
Controls and Switches:
Mode switch-rear
Input Level Controls (two)-front
Power switch-front
Front-Panel Indicators:
Power LED
Clip LEDs (two)
Protect LEDs (two)
Connections,
Input:
1/4-inch phone (two)
Female XLR-type connectors (two)
Octal accessory sockets (two)
(powered with ±15 volts dc at 25 mA)
Output:
Five-way binding posts
Power:
1.83 m (6 ft), three-wire, 16 GA power
cord with NEMA 5-15 plug/IEC
Fuse Type:
T 4.0 A/250 V Slo-Blo
® or equivalent
(for 120 V ac use)
Power Requirements:
120 V ac, 50/60 Hz, 400 watts
(configurable to 220/240 V ac)
100 V ac, 50/60 Hz model available
Power Consumption/Heat Produced (both
channels operating, dual mode, with 1 kHz
sinewave input signal at stated output
power into 4 ohm loads),
Idle:
30 watts/0.238 kBTU/hr
One-Eighth Maximum Midband Power:
270 watts/1.364 kBTU/hr
One-Third Maximum Midband Power:
390 watts/2.047 kBTU/hr
Rated Output Power:
600 watts/3.070 kBTU/hr
Maximum Midband Power:
730 watts/3.309 kBTU/hr
Operating Temperature Range:
Up to 50 °C (122 °F) ambient
Dimensions,
Height: 44.4 mm (1.75 in.)
Width: 482.6 mm (19.0 in.)
Depth: 325.1 mm (12.8 in.)
Color:
Gray and black
