7
M-1500/2000
POWER AMPLIFIER
Bridged and Parallel Modes
Bridged and Parallel Modes
The M-1500/2000 provides a rear-panel switch that allows it to be used in either a Bridged or Parallel
mode. When this switch is placed in the “STEREO” (center) position, the M-1500/2000 functions as a true
stereo amplifier, where both of the two independent amplifier channels (Channel 1 and Channel 2) can
receive different input signals and produce independent output signals.
However, when the switch is placed in the “BRIDGED” (left) position, the Channel 1 inputs signal is routed to
both power amplifiers bridged together, producing a single output signal with a true 1500 watt output into
a single 8 ohm channel (in the case of the M-1500) or a true 2000 watt output into a single 8 ohm channel
(in the case of the M-2000).
WARNING: Bridged mode is to be used only when the M-1500/2000 is connected to an 8Ω speaker
load. Use of Bridged mode with speaker loads of 4Ωs or less can result in severe damage to
the unit due to excessive heat and current limiting and will void your warranty!
The illustration belows shows how this works. In Bridged mode, the polarity (phase) of the Channel 2 output
signal is reversed relative to that of the Channel 1 output signal. Both channels then process the same input
signal, with the speaker load connected so that power is derived from both channels. The effective voltage
swing seen by the load is thus doubled, so that the power output is doubled.
When using the M-1500/2000 in Bridged mode, be sure to connected your loudspeaker as shown in the
illustration on page 9 (and as silkscreened on the rear panel), with the red (+) terminal of the Channel 2
output connected to the negative input of the speaker and the red (+) terminal of the Channel 1 output con-
nected to the positive input of the speaker. Do not use the black ground (–) output terminal of either channel
(the speaker load must “float” away from the amplifier chassis).
When the rear panel switch is placed in the right “PARALLEL” position, the M-1500/2000 operates in a
unique Parallel mode. In this mode, only the signal present at the Channel 1 input is used (and only the
Channel 1 input control is functional). This signal is then routed to both the Channel 1 and Channel 2 power
amplifiers, thus producing a dual mono output, with 750 watts per channel into 4 ohms (in the case of the
M-1500) or 1000 watts per channel into 4 ohms (in the case of the M-2000).
See pages 8 in this manual for interconnection diagrams when using M-1500/2000 in Bridged or Parallel
modes.
Bridged Mode
INPUT
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
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