Biamp SPM723 Specifications download pdf (Page 7)

REAR PANEL

Input: These plug-in barrier strips provide the balanced line-level

inputs to the channels. For balanced connection, wire high (+), low

(-), and ground (



). For unbalanced connection, wire high (+) and

ground to both (



) & (-). NOTE: When using a pair of channels in

'bridged' mode (see Bridge below), input signal must be connected

to the odd

numbered channel.

Level: These screw-driver adjustable controls determine the level

of input signals allowed into the channels. Level provides a gain

range from 'off' (min.) to 'unity' (max.). The Level control is factory

set for -24dB of gain, which will produce maximum output power

with input signal peaks of +24dBu. For best performance, first

adjust the source

signals for optimum (maximum) levels, then

adjust the MCA Series Level controls for the desired volume.

Signal / Peak Indicators: These 2-color LEDs indicate the signal

level for each channel. When an LED is green, that channel has

signal (above -30dB). When an LED is red, that channel signal is

clipping (max. power). CAUTION: Signal levels should be

adjusted to avoid clipping. Clipping can cause severe distortion,

over-temperature conditions, and even loudspeaker damage.

NOTE: Signal / Peak indicators will turn off during Temp / Fault

condition (see Temp / Fault Indicators on pg. 3).

HPF: These DIP switches provide High-Pass Filters for the input

channels. High-Pass Filters are used to eliminate unnecessary

lower frequencies (12dB/octave @ 125Hz) for speech and

distributed speaker applications. From the factory, the High-Pass

Filters are bypassed (switches up). To assign a High-Pass Filter

on an input channel, move the switch to the down position.

CAUTION: To avoid output fault conditions, High-Pass Filters

must be assigned on channels driving 25/70/100 Volt speaker

systems (see Output below). Also, any other system equalization

affecting frequencies below 125 Hz should remain flat or be used

as cut-only.

Bridge: These DIP switches allow adjacent channels to Bridge

together in pairs, for a higher, combined output power (see

Bridging on pg. 6). Bridge disables the even numbered input, and

applies the odd numbered input signal to both amplifier channels.

From the factory, Bridge is bypassed (switches up). To assign

Bridge to a pair of channels, move the switch to the down position.

Output: These screw terminals provide the speaker outputs from

the channels. Connect the positive speaker line to the (+) terminal

and the negative speaker line to the (-) terminal of the channel

being used. The minimum speaker load on an individual channel

is 4 ohms. NOTE: When using a pair of channels in 'bridged'

mode (see Bridge above), connect the positive speaker line to the

(+) terminal of the odd

numbered channel and the negative

speaker line to the (+) terminal of the even

numbered channel.

The minimum speaker load for a bridged output is 8 ohms. Output

transformers for 25/70/100 Volt speaker systems are available as

user-installed options (installation instructions are included with the

output transformers). Transformers (by model) are as follows:

TDT50 = MCA 8050 individual channels (50 Watts)

TDT100 = MCA 8050 bridged channels (100 Watts)

TDT150 = MCA 8150 individual channels (150 Watts)

TDT300 = MCA 8150 bridged channels (300 Watts)

Remote Control: This 15-pin Sub-D (female) connector provides

remote level & muting control of the input channels (see Remote

Control on pg. 6). NOTE: When using a pair of channels in

'bridged' mode (see Bridge above), apply Remote Control only to

the odd

numbered input channel.

AC Power Entrance: The switch applies AC power to the unit.

The 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.

Fuse: MCA 8050 @ 115VAC Fuse = 10A NB

. MCA 8050 @

230VAC Fuse = 4A SB

. MCA 8150 @ 115VAC Fuse = 15A NB.

MCA 8150 @ 230VAC Fuse = 6.3A SB

. Replace Fuse with same

type and value only. NOTE: If the Fuse continues to blow (even

after checking for proper output connections and speaker loads)

the amplifier may require service.

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Biamp SPM723 Specifications Page 7

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