Biamp CPA130 - Manual (Page 9)

REAR PANEL
Autoformer Mounting Holes: These holes are for mounting of optional autoformers to the rear panel of the CPA130. Autoformers allow
the CPA130 to be used to drive 25V, 70V, or 100V distributed speaker systems (see 5-Way Speaker Binding Posts below).
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 3A L 250V fuse. For ~230 VAC operation, use a T 1.6A L 250V fuse.
Voltage Selector Switch: For 115 VAC operation, slide to the left position toward 115V. For 230 VAC operation, slide to the right position
toward 230V.
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 CPA130. 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 CPA130 front
panel (see Internal Modifications: Front Panel Level Controls on page 9). NOTE: Modifications must be performed by qualified service
professionals.
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 CPA130. 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 CPA130 will deliver up to 65 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 CPA130
will deliver up to 130 Watts mono-bridged into an 8 ohm minimum load. Autoformers are available from Biamp Systems, which allow the
CPA130 to be used to drive 25V, 70V, or 100V distributed speaker systems (see Internal Modifications: High-Pass Filter on page 5). When
using the CPA130 in stereo mode, the appropriate autoformer for each channel is a DT-2A. When using the CPA130 in mono-bridge
mode, the appropriate autoformer is a DT-3A.
Mono-Bridge Switch: When depressed, this switch selects the mono-bridge mode of operation. In mono-bridge mode, Channel 1
becomes 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 CPA130 will deliver up to 130 Watts
mono-bridged into an 8 ohm minimum load.
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