21.Power Amplifier Input
Provides a direct input to the power amplifier with an input sensitivity of 1 Volt. When an RCA phono plug is inserted into this input, the connection between the preamp output and the power amp input is internally disconnected allowing direct access to the power amplifier. Using this input along with the preamplifier output (#9), a signal processor can be inserted between the mixer and the power amplifier.
22.Bridge In/Out
Provides an output signal that is independent of the Master level, Low EQ, and High EQ controls. It also may be used as a mixing output point when the similar terminal of another mixer/amplifier is connected to this terminal. A separate tape recorder output may be taken from this point without interaction of EQ and Master level control. The input impedance of the equipment connected to this terminal should be greater than 10k Ohms.
23.Program Input
Provides an auxiliary input that accepts signals from other sources such as another mixer or mixer/amplifier. The signal level at this input is controlled by the PROGRAM level control on the front panel and is fed to the mix bus. The Program input may be regarded as “Channel 9” without
NOTE: This input is muted whenever the Mute 1 bus is activated (#24).
24.Ext Mute 1/2
When either of these terminals is connected to the Shield terminal (SHD), the respective mute bus is activated and fed to any
25.External Volume Control
These connections allow the use of an external (remote) master volume control. For complete command of the volume from the remote control, the front panel Master Level control (#1) must be set at its maximum (10) position. The remote volume control should be connected as shown in Figure 1, with the clockwise terminal connected to the Shield (SHD); the wiper connected to the Control (C); and the counterclockwise terminal connected to the Voltage (V). Using a 10k Ohm linear taper potentiometer will provide approximately 30 dB attenuation, while using a 100k Ohm linear taper potentiometer will provide approximately 60 dB attenuation. See Figure 1.
Figure 1
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