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2.5.4 Parallel-MonoOperation
Configure the LV 3620 in the Parallel-Mono mode to drive loads with a total
impedance of less than 4 ohms. (See Bridge-Mono if the load is 4 ohms or
greater.) Installing the amplifier in Parallel-Mono mode is very different from
the other modes and requires special attention.
To put the amplifier in Parallel-Mono mode, first turn it off, then slide the
Dual-Mono switch to the left (as you face the back). Connect the input signal
to Channel 1 only.
Note: Do not use the channel 2 input or the signal level and quality
may degrade greatly. The input jack for Channel 2 is not defeated in
Parallel-Mono mode. Any signal fed into Channel 2 may distort the
signal in Channel 1. It is normal for the IOC indicator of Channel 2
to stay on in Parallel-Mono mode.
Install a jumper wire between the red binding posts of both Channel 1 and 2
that is at least 14 gauge in size. Then, connect the load to the output of
Channel 1 as shown in Illustration 2-9. The positive lead from the load
connects to the red binding post of Channel 1 and the negative lead from the
load connects to the black binding post of Channel 1.
Do not attempt to operate in Dual or
Bridge-Mono mode until the Parallel-
Mono jumper is first removed. Failure
to do so will definitely cause
inefficient operation, high distortion
and excessive heating.
PUSH TO RESET
100 VAC / 7.5 A / 50-60 Hz
120 VAC / 7.5 A / 50-60 Hz
230 VAC / 7.5 A / 50-60 Hz
STEREO
PARALLEL
BRIDGED
REG. U.S. PAT. OFF.
MONO
MONO
4,330,809
4,611,180
CAUTION: TURN OFF AMPLIFIER
4,788,452
BEFORE CHANGING THIS SWITCH!
Illustration 2-9 Parallel mono wiring
Installation
LV3620
CAUTION
INPUT SOURCE
Shield
(+)
(–)
BALANCED INPUTS
P.I.P. - BB
CH-2
CH-1
(+)
(–)
(+)
(–)
+ = NON-INVERTING
– = INVERTING
GROUND LIFT
BALANCED
UNBALANCED
CH-2
CH-1
INPUT WIRING
INPUT WIRING
Z
+
+
TIP
TIP
–
RING
SIGNAL
CHASSIS
GROUND
GROUND
SLEEVE
GND
GND
SLEEVE
LIFT
I N P U T
(+)
LOAD
(–)
C
C
H
H
2
1
BRIDGED MONO WIRING
1
TURN AMP OFF.
IMPORTANT:
2
SET STEREO–MONO SWITCH
CLASS 1 OUTPUT WIRING
TO BRIDGED MONO.
REQUIRED.
3
OUTPUT ACROSS RED
TERMINALS ONLY.
(CH-1 IS POSITIVE.)
O U T P U T
2–10
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