4
INSTALLATION STEP 2
t
SETTING THE CROSSOVER MODES
The REFERENCE604 incorporates a sophisticated, fully adjustable electmnic
crossover for each of its two pairs of channels, as well as its crossover outputs.
The REFERENCE604 can drive a full system with a second amplifier without
need of an outboard electmnic crossover.
Before installing the amplifier. make certain the switches on the bottom are set
to the correct positions. Pages 16
-
21 contain six sample systems illustrating
switch settings. After setting the switches, be sure to install the hole plugs
included with the amplifier.
LOW PASS
J
The low pass crossover is used for sending only low frequency information to
particular speakers (or crossover outputs). Activate the low pass crossover if
you intend to drive
subwoofers.
Low pass signal is derived from all four inputs,
allowing constant bass (low pass) with front to rear fading. You
can
later adjust
the exact frequency from the front of the amplifier.
For
ease
ofadjustment, there
is one low pass setting for all channels (and crossover outputs) receiving low
frequency information.
HIGH PASS
The high pass crossover is used for sending only midrange and high frequency
information to particular speakers (or crossover outputs). Activate the high pass
crossover if you intend to drive satellite or coaxial speakers in the system along
with
subwoofers.
Even if your system does not include subwoofers it may be
helpful to activate the high pass crossover
with
smaller speakers to protect them
from
low
frequency information. You can later adjust the exact frequency from
the front of the amplifier. The high pass frequency for Channels 1
&
2 is
adjusted separately from the high pass frequency for Channels 3
&
4.
4
INSTALLATION STEP 3
p
SELECTING INPUT MODES
The REFERENCE604 can be driven with either one or
two
pairs of stereo inputs.
If your source unit has front and rear outputs, you can take advantage of its
fading capability by driving the REFERENCE604
with
two
pairs of inputs. In
addition, if you have another amplifier, you can drive it
with
the outputs of the
REFERENCE604.
The REFERENCE604 is capable of operating in a “pure”
Coherent Sterep mode with identical left and right channels. or in a “mixed-
mono” mode allowing you to operate each pair of channels in stereo (not
Coherent Stereo) and mono simultaneously.
4 CHANNEL OPERATION
WfTH
4 CHANNELS OF INPUT
. Input to Channels 1 8 2 and set stereo switch to either “Coherent Stereo”
ox
‘Mixed-Mono”
. Input to Channels 3
&
4 and set input switch to “3
&
$‘; stereo stitch to either
“Coherent Stereo’ or ‘Mixed-Mono”
4 CHANNEL OPERATION WlTH 2 CHANNELS OF INPUT
l Input to Channels 1
&
2; set stereo switch to either “Coherent Stereo” or
‘Mixed-Mono”
. Channels 3
&
4: set input switch to ‘Internal From Ch 1 8 2”; stereo switch to
either’coherent
Stereo” or”Mixed-Mono”
BRIDGED 2 CHANNEL OPERATION WITH 2 CHANNELS OF INPUT
. Input to Channel 2: set stereo switch to “Mono”
l Input to Channel 4: set input switch to “3 8 4”; stereo stitch to “Mono”
3 CHANNEL OPERATION WITH 2 OR 3 CHANNELS OF INPUT
Either half of the REFERENCE604 can be bridged mono while the other half
operates in stereo.
‘NOTE:
When
in “Mono’; only fhe right channel input is active.
If
your inputs to
the amplifier are stereo,
you
can sef the stereo switch to
“Mix&Mono”
and use
both
inputs. The amplifier
will
sum
left
and right to mono.
1
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