Electro-Voice 7600 - Signal Connections; Input Connections; Line Output Connections; Output Connections

Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier
a. 120 V ac Primary Wiring
220/240 V NOTE;
The 300 ohi fan
dropping resistor
aust be replaced
with a 600 oha
resistor to alnl-
alze fan noise.
b. 220/240 V ac Primary Wiring
Figure 2 Primary Wiring Configuration for 120 V ac and 220/240 V ac
°F), the equipment should be spac¬
ed at least 1.75 inches apart or a
blower installed to provide suffi¬
cient air movement within the cab¬
inet.
WARNING: Do not operate the
amplifier within a completely
closed unventilated housing.
3 SIGNAL CONNECT¬
IONS
3.1 I nput Connections
Balanced input connections
may be made to either the '/«"
phone (TRS) or the female XLR
connectors. For single-ended in¬
puts, strap the low (—) input to
ground (pin 3 on XLR or Ring on
Vi" phone). Otherwise, the electron¬
ically-balanced input stage will see
6 dB less input signal level than
with a balanced input. Refer to Fig¬
ure 3 for typical input connections.
3.2 Line Output Connect¬
ions
The XLR and Vi" phone
connectors are wired in parallel.
Pin 2 of the XLR is the Tip of the
Vi" phone connector, and pin 3 is
the Ring. Since the input
impedance of the electronically-
balanced input stage is high (15
kohms), there is minim al loading
on the signal source. When the
input connections are made to one
connector, the other may be used
as an auxiliary line output to feed
other high input impedance
equipment. Refer to Figure 3 for
possible applications.
3.3 Output Connections
Output connections can
made to either the four terminal
barrier strip connector OR the
Neutrik Speakon® connectors. Re¬
fer to Figure 4 for typical output
connections.
Neutrik Speakon connectors have
been incorporated into the 7600 be¬
cause they offer a number of attrac¬
tive benefits: the connector is lock¬
ing and airtight; it’s very strong
(you can actually stand on it with¬
out damage); it will accommodate
wire gauges up to 10 AWG; termin¬
ations are solderles3 making field
servicing easy; and they meet the
test safety requirements of UL,
CSA, and IEC 65 (“test finger” pro¬
cedures).
The 7600 amplifier has three Speak¬
on output connectors: one for the
Left output, one for the Right, and
one for Mono. Although this goes
against the original Neutrik design
of having a 4-pole connector to al¬
low bi-amping in a single connect¬
or, it gives you the larger benefit of
having speaker cables that are usa¬
ble for left, right, or mono appli¬
cations.
The three Speakon output connect¬
ors are 'wired identically: the “+"
signal is connected to the “1 + ” pin
on the connector, and the “—” sig¬
nal is connected to the “1—” pin.
The connectors are clearly labeled
on the back of the amplifier for
Channel 1, Channel 2, and Mono.
WARNING: Check your applicati¬
ons carefully. There are speaker
systems that have Speakon connect¬
ors on them (including some EVsys¬
tems) that are not wired to the
convention above. This means that
a speaker cable equipped with Neu¬
trik connector at both ends may not
properly connect the amplifier to the
speaker.
3.4 O utput Cable Selection
Speaker wire size plays an
important part in quality sound sys¬
tems. Small wire gauges can waste
power and reduce the damping fac¬
tor at the speaker terminals. This
can add coloration and muddiness
to the sound. To help offset this
problem, Table I has been assemb¬
led to enable you to calculate the
power losses in the speaker cable.
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Electro-Voice • a Mark IV Company