The Model 9 Mixer/Attenuator is the forth in a series of utility modules from Plan B. A truly modular, multi-tasking 5 in, 3 output mixer, it's balanced inputs are suited for either AC signals or DC control voltages, or both simultaneously.

Along with these mixing options, each of the four main inputs channels are fitted with dedicated Attenuator Outputs which allow access to the leveled output from each channel by itself, independent of the mix.

Expandable

With its main input channels the M9 has a fifth AUX INPUT - a dedicated unity gain input designed to stack multiple mixers without taking one of the main attenuated input channels. It can accept signals from any source, not just that from an auxiliary mixer.

Output Routing Matrix

Each of the main input channels of the Model 9 has a three-way routing switch which allows it's output to be sent out the Channel A, Channel B or when set in the center position, muted from both the A and B output channels. The AUX Input has a similar router, but does not allow muting - it's a two way switch for A or B output only.

Stereo, Mono or Dual Operation

The M9's five routing switches can be configured for signal placement within a stereo field, or used to process two independent mixes independently (as 2 two channel mixers, one two channel, one three channel (AUX In), etc). A third A+B OUT combines the output of the A and B channels (a mono output which returns the mix of all 5 input channels - see figure 1). Thanks to it's DC balanced inputs the Model 9 can process both AC and constant-current DC control voltages, which makes it's dual output possibilities even more useful as you can use a single M9 to manage independent AC and DC mixes at the same time.

Independent Attenuators

At the suggestion of Plan B user Norman Fay, each of the four main input channels have been fitted with a forth output - a separate ATTENUATOR OUTPUT which consists of the post-fader level of each input channel by itself. Threw routing matrix settings these Attenuation outs can be removed from the A and B output buss so that they be used as independently. The Attenuator Outputs are not effected by the router settings. Thanks Norman for the solid idea!