7
There are three options when connecting audio inputs
to the amplifier:
1. Zone Line In Connectors: Use the local inputs to
dedicate one audio source to its corresponding zone
speaker outputs.
2. Bus A Input: Use the Bus A input to pass an
additional audio source, such as paging to any of the
amplifier zones using the rear panel dip switches.
3. Bus B Input: Use Bus B input to pass an additional
audio source, such as door chimes to any of the
amplifier zones using the rear panel dip switches.
BUS THRU Outputs
Each of the Bus Inputs provide non-buffered loop
outputs to allow multiple amplifiers to share common
audio sources. The loop outputs on the amplifier are
not buffered, and the number of amplifiers that can be
connected in series will depend on the output capability
of the audio source. The source connected to the LEFT
and RIGHT IN connections passes through to the LEFT
and RIGHT THRU Outputs. Always use high-quality,
shielded interconnect cables.
BUS A SUB Out
BUS A has subwoofer output connection, which sums
the signal from the LEFT and RIGHT IN connections.
Setting the X-OVER switch to 80Hz or 120Hz will apply a
low-pass filter to the SUB OUT signal. A matching high-
pass filter will be applied to the BUS A signals routed to
amplifier zones by the rear-panel dip switches. The BUS
A THRU signals are unaffected.
The 80Hz setting is the proper setting for most
subwoofer applications when used with large and
medium main speakers. The 120Hz setting is typically
used with smaller main speakers or when more bass is
required in a larger room.
1. Connect a stereo line-level source with an RCA cable
into the BUS A Left and Right IN.
2. Connect a single RCA cable from the SUB OUT jack
to the line-level input on a powered subwoofer, such
as a Sonance D8, i8, i10, or i12.
Figure 4: Using the Subwoofer Line-Level Output with the
Bus A Inputs (not applicable with the Bus B or local inputs)
SUB OUT
If using a separate power amplifier, connect the cable
from the SUB OUT jack to the input specified in the
manual for that power amplifier. If a zone in this amplifier
is being used in bridged mode (8 ohms minimum), use
the Zone IN connection labelled “BRIDGE” as described
in the “BRIDGING CHANNELS” section of the manual.
Input DIP Switch Assignments
The DIP switches enable one or more audio sources to be
played through one or more speaker outputs
simultaneously. The amplifier channels can then be set
to the local (direct) source, Bus A signal input and/or Bus
B signal input. Turning the DIP switch to ‘ON’ causes the
source to play through the assigned speaker output.
Two zone example, the home could be subdivided into
two zones with two audio sources. One source connected
into Bus A and a second source into Bus B (not into the
Local Input). Set one half of the amplifier’s DIP switches
to Bus A and the second half of the amplifier set to Bus B.
Control system example, the input connections can all be
local for a discrete four zone system with Bus A switched
‘ON’ for doorbell monitoring and Bus B ON for paging
duties. What will be heard in each zone depends on the
sources connected to the various inoputs and the DIP
switch settings.
3
1
ZONE 1
ZONE 2
ZONE 4
ZONE 3
Figure 5: Input DIP Switches
3
1
ZONE 1
ZONE 2
ZONE 4
ZONE 3
Zone Trim Controls
Each zone on the amplifier has a volume adjustment
accessible on the rear panel of the amplifier. This control
is a TRIM control, not a volume knob, so the minimum
gain setting (fully counter-clockwise) will not turn off
the output. The range of adjustment is +15 to +30dB of
gain. The zone trim control is intended to be set below
Figure 6:
Volume Control
the point at which amplifier and
speakers distort, thereby preventing
speaker damage. The volume
controls also allow balancing of
the sound levels of different zones
or the outputs of the right and left
channels to compensate for various
room characteristics or seating
arrangements.
3
1
ZONE 1
ZONE 2
ZONE 4
ZONE 3
IMPORTANT: DO NOT COMBINE NEGATIVE TERMINALS. THE
AMP IS NOT COMMON GROUND TYPE ARCHITECTURE.
