PM1800A-16

A three-position input attenuator (Pad) switch, plus a continuously variable Gain control that provides 34 dB of trim range. Together, these circuits enable the PM1800A faders to remain at nominal position, and its amplifiers to maintain stable, low noise, low distortion performance with literally any mic or line level input signal. The Pm1800A's transformerless inputs provide the "transparent" sound that many engineers prefer, while retaining excellent stability and good common mode rejection

Each input channel includes a four-band sweep-type equalizer plus a variable frequency high pass filter. The Low-Mid and High-Mid bands of the equalizer provide peaking equalization sweepable from 160 to 1,600 Hz and 800 to 8,000 Hz respectively.

Each input channel has an Insert In and Insert Out jack which serve as a patch point for processors such as compressor/limiters or effects devices. When nothing is connected, signal is normalled to jump across the jacks. The Insert point operating level is OdBu.

There are eight group mixing busses and six auxiliary mixing busses to which any of the input channels can be assigned. In addition, there is a stereo mixing bus which can be driven from the groups, plus a cue bus (for preview of channel inputs, groups, matrix channels, or the stereo mix).

Each input channel has eight mute assign switches. These permit the channel's on/off function to be remotely controlled by the eight master mute switches. Once a channel is switched on locally, it can be muted (turned off) or unmuted (turned on) if it is assigned to one or more of the mute groups.

The PM1800A mix matrix is an 8 x 4 configuration. That is, there are 8 possible sources (derived from the group busses, and either pre or post group fader, depending on internal jumpers) that can be mixed together into one output.

There is a stereo return, with a Bal/Pan control for relative or odd/even level adjustments. The return is configured so it can apply a stereo signal to any of the group mixing busses, only to group busses 7 and 8, or it can be bypassed for direct assignment to the group busses. At the same time, it can apply signal directly to aux send busses 1 through 6; this is useful for "looping" one effect out to the next .

There is a cue/solo switch on every input channel, and there are two cue switches (L/ MONO and R) on each of the four aux return channels. There is also a cue switch on every master auxiliary send, the group outputs, the matrix out-puts, and the stereo master output. A master Cue/Solo mode switch sets the console for cue or solo mode (this switch is recessed to prevent accidental mode changes).

A "CLIP" LED at the input preamp facilitates proper input sensitivity (Pad and Gain control) adjustments before the signal is ever applied to a bus. Overboost in the EQ could still cause clipping, so another "Clip" LED is included after the channel's EQ section. Additional LEDs illuminate when any Mute Group is assigned. LEDs are also used to illuminate the channel on switch, Cue/Solo switch, and so forth.