Manual

3.5. Input options

1 mono 4 mono amplifiers for 4 different mono signal

2 mono 4 mono amplifiers for a common mono input

3 mono 4 mono amplifiers for a common stereo input

4 stereo 2 stereo amplifiers for 2 different stereo inputs

5 stereo 2 stereo amplifiers for a common stereo input

6 bridged 2 bridged amplifiers for 2 different mono signals

7 bridged 2 bridged amplifiers for a common mono signal

8 bridged 2 bridged amplifiers for a common stereo signal

9 combination 1 bridged amplifier and 2 mono amplifiers for a common mono input

10 combination 1 bridged amplifier and 1 stereo amplifier for 2 different stereo inputs

11 combination 1 bridged amplifier and 1 stereo amplifier for a common stereo input

INPUT SIGNALS INPUT SELECTORS MODE ST-BR

1 2 3 4 CH1 CH2 CH3 CH4 CH1-2 CH3-4

1 I1 I2 I3 I4 IN1 IN2 IN3 IN4 ST ST

2 I - - - IN1 LINK CH1 LINK CH1 LINK CH2 ST ST

3 L R - - IN1+IN2 LINK CH1 LINK CH1 LINK CH2 ST ST

4 L1 R1 L2 R2 IN1 IN2 IN3 IN4 ST ST

5 L R - - IN1 IN2 LINK CH1 LINK CH2 ST ST

6 I1 - I2 - IN1 - IN3 - BR BR

7 I - - - IN1 - LINK CH1 - BR BR

8 L R - - IN1+IN2 - LINK CH1 - BR BR

9 I - - - IN1 LINK CH1 LINK CH1 LINK CH2 BR ST

10 L1 R1 L2 R2 IN1+IN2 - IN3 IN4 BR ST

11 L R - - IN1+IN2 IN2 LINK CH1 LINK CH2 BR ST

3.6. Limiter circuit

This system is an always active protection inside the MPA R series of amplifiers. The ANTICLIP

circuitry constantly analyses harmonic distortion caused by excessive signal excursion at the power

amplifier's output and automatically reduces the input level in order never to reach distortion. The

MPA4-400R amplifiers are delivered with the anticlip system adjusted at a threshold of 1% THD (hard

limiting). However, this value can be switched to a softer limiting (5% THD) via an internal jumper (see

diagram).

The great convenience of such a circuit in any kind of installation has to be remarked: The clear

advantage of a limiting system in front of conventional compressors is that the former does practically not

alter the dynamic range, acting only when the distortion threshold is reached.

CAUTION: Changes on the ANTICLIP configuration have to be performed by a qualified

technician.