Biamp CPA650 - Manual (Page 9)

7
REAR PANEL FEATURES
AC Power Entrance: This receptacle accepts the detachable AC Power Cord. The AC Power Cord is for connection to three-prong
grounded AC outlets. CAUTION: Do not remove or defeat the ground prong on the AC Power Cord, as this constitutes a shock hazard.
The Fuse Clip may be removed by first detaching the AC Power Cord, then prying the Fuse Clip out from above, using a flat-blade
screwdriver in the notch provided. The Fuse Clip contains the standard fuse for the selected AC operational voltage. The standard fuse is
held in the clip, and becomes the actual AC fuse when the Fuse Clip is installed. Replace the standard fuse only with the same value and
type. For ~115 VAC operation, use a T 10A L 250V fuse. For ~230 VAC operation, use a T 5A L 250V fuse.
Voltage Selector Switch: For 115 VAC operation, slide until 115V is displayed. For 230 VAC operation, slide until 230V is displayed.
Channel Level Controls: These controls adjust the input signal level for each channel. After setting appropriate levels at the signal
source, then adjust the Channel Level Controls for the desired output volume from the CPA650. In mono-bridge mode, Channel 1
becomes the active input and Channel 2 input is inactive. As an option, the Channel Level Controls may be mounted to the CPA650 front
panel. CAUTION: Disconnect the CPA650 from AC power before removing the top panel. Remove the plugs from the front panel
mounting holes (save them for the rear panel mounting holes). Remove the knobs and the nuts from the level controls (use an 11mm or
7/16" nut driver). Move the level controls to their respective front panel mounting holes. Re-install nuts and knobs (hold onto controls to
avoid twisting wires). Install plugs in rear panel mounting holes. Check wire routing to avoid pinching or over-heating of wires. NOTE:
Relocation of Channel Level Controls must be performed by trained service personnel only.
Input Barrier Strip: These barrier strip screw terminals are for connection of line-level input signals to the channels. For balanced inputs,
connect High to (+), Low to (-), and Ground to (gnd). For unbalanced inputs, connect High to (+) and Ground to both (-) & (gnd). In mono-
bridge mode, Channel 1 becomes the active input and the Channel 2 input is inactive.
5-Way Speaker Binding Posts: These 5-way binding posts are for connection of speaker loads to the CPA650. In stereo mode, the red
(+) terminal of each channel is for connection to speaker positive, and the black (-) terminal for each channel is for connection to speaker
negative. The CPA650 will deliver up to 325 Watts per channel into 4 ohm minimum loads. In mono-bridge mode, the red (+) terminal of
Channel 1 is for connection to speaker positive, and the red (+) terminal of Channel 2 is for connection to speaker negative. The CPA650
will deliver up to 650 Watts mono-bridged into an 8 ohm minimum load. When using the CPA650 in mono-bridged mode, an autoformer is
not necessary to drive 70V speaker systems. However, the load must be floating (neither side grounded) and capacitors should be used
for isolation (see 70V Mono-Bridge Output on pg. 8).
Mono-Bridge Switch: This switch selects stereo or mono-bridge operation. In mono-bridge mode, Channel 1 is the active input and the
Channel 2 input is inactive. The red (+) speaker terminal of Channel 1 is for connection to speaker positive, and the red (+) speaker
terminal of Channel 2 is for connection to speaker negative. The CPA650 delivers 650 Watts mono-bridged into an 8 ohm minimum load.
Ground Lift Switch: This recessed switch allows the circuit (signal) ground to be lifted (disconnected) from the chassis (AC) ground. This
can help prevent hum inducing ground loops within the sound system, while maintaining safe AC grounding of the chassis.