Installation
LV3620
2–10
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.
PUSH TO RESET
REG. U.S. PAT. OFF.
4,330,809
4,611,180
4,788,452
100 VAC / 7.5 A / 50-60 Hz
120 VAC / 7.5 A / 50-60 Hz
230 VAC / 7.5 A / 50-60 Hz
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH!
STEREO
BRIDGED
MONO
PARALLEL
MONO
(–)
(+)
CH-2
CH-1
BALANCED INPUTS
+ = NON-INVERTING
– = INVERTING
(–)
(+)
P.I.P. - BB
CH-2
CH-1
GROUND LIFT
Z
UNBALANCED
INPUT WIRING
+
CHASSIS
GROUND
LIFT
TIP
SLEEVE
GND
BALANCED
INPUT WIRING
+
–
TIP
RING
SLEEVE
GND
I N P U T
SIGNAL
GROUND
C
H
2
IMPORTANT:
CLASS 1 OUTPUT WIRING
REQUIRED.
O U T P U T
BRIDGED MONO WIRING
TURN AMP OFF.
SET STEREO–MONO SWITCH
TO BRIDGED MONO.
OUTPUT ACROSS RED
TERMINALS ONLY.
(CH-1 IS POSITIVE.)
1
2
3
C
H
1
INPUT SOURCE
(+)
(–)
Shield
(–)
(+)
LOAD
Illustration 2-9 Parallel mono wiring
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.
CAUTION
