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10
INSTALLATION STEP 1
COHERENT STEREO™ /
MIXED-MONO / BRIDGED MONO
The REFERENCE Class A amplifiers have the ability to operate in any one of
the following modes:
Coherent Stereo™ with identical left and right stereo channels for
maximum fidelity. Best choice for satellite speakers. Use this mode unless
Mixed-Mono is necessary.
Mixed-Mono in order to drive stereo and mono simultaneously; works well
for center channels. It can be used anytime you need a summed mono
channel. Somewhat sacrifices sonic accuracy as additional circuitry is
introduced to one channel. In Mixed-Mono, the left channel is inverted, see
diagram below or on the bottom of the amplifier.
Bridged Mono for dedicated single channel operation; ideal for driving
subwoofers. It is also used when large amounts of power are necessary for
single speakers. In bridged mono, only the right channel input is active.
In bridged mono, only the right channel input is active.
NOTE: If you intend to drive a
REFERENCE Class A amplifier in Mono but
have stereo outputs from your crossover or
source unit, you can put the switch in
11
INSTALLATION STEP 2
BALANCED / UNBALANCED INPUT
The REFERENCE Class A amplifiers have the ability to accept either a
standard Unbalanced RCA signal inputs, or a Balanced "Pro Audio" inputs with
the use of the Soundstream BLT Balanced Line Transmitter or some other
balanced line audio source. Before installing your system, you should decide
The REFERENCE Class A amplifiers' signal inputs accept two ranges of input
signal levels: 0.2 - 2.0 Vrms, or 0.5 - 5.0 Vrms for both Balanced and
Unbalanced inputs. The input range switch position and level settings are
dependent upon the preamplifier / source unit output signal level. For the best
system Signal to Noise Ratio, we recommend that the input level controls be
set as far down as possible (rotated counter-clockwise), while maintaining an
acceptable level of output.
Using the "Unbalanced" RCA input
When using the Unbalanced RCA input, the RIGHT channel input signal
switch MUST be in the "UNBAL" position. Also, when first installing the
amplifier using this input configuration, we suggest that the left channel input
signal switch be in the "UNBAL" position as well. If you experience
alternator wine or other installation noise with both switches in the
"UNBAL" position, try moving the LEFT channel input signal switch to
the "BAL" position. This should remove any system noise due to
installation.
Using the "Balanced" RCA input
When using the Balanced 6-pin DIN input, both switches MUST be in the
"BAL" position. Also, we recommend that when using this input configuration,
the "INPUT LEVEL" switch be in the "0.5 - 5V" position, and the gains on the
UNBALANCED INPUT BALANCED INPUT
ADVANTAGES 1.Most preamplifier / source
units have "UNBAL" RCA
outputs. (Industry stan-
dard)
2.No Interface module is nec-
essary
1.Improved Signal to Noise
Ratio. (S/N Ratio)
2.Excellent noise cancellation
characteristics.
3.Immune to noise radiated in
the car audio environment.
NOTE: The pin
configuration shown
in the diagram is the
view looking into the
Balanced input jack
on the amplifier.