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The PM8 Passive 8 Channel Summing Mixer from SM Pro Audio is an acquired multi-channel passive summing mixer of high class that meets the demands of the home and professional studio. This sturdy 2RU allows for
up to 8 channels of audio to be passively mixed down to a stereo output pair. Each input channel features its own pan, mute, and rotary volume attenuator control. Eight professional combo connector inputs (XLR & ¼" TS) and three balanced XLR stereo output pairs can be found on the rear panel. A 25-pin D-sub connector is also available for direct connection from compatible Tascam and Digidesign systems.
The PM8 has a professional internal power supply suitable for operation between AC 110/115V to 220/230/240V. A voltage configuration switch on the left hand side of the rear panel should be set to match the appropriate voltage of your mains power supply. Simply slide the selector switch with your finger or a small flat-blade screwdriver to either the 115V or 230V position to configure the
The unit combines up to eight analog channels into a clean and clear stereo pair, with all the sonic depth and dynamics intact. It's the perfect tool for merging great sounding hardware synths and samplers into the mix without compromise.
However with all passive mixing devices, attenuating the signals will lead to an obvious drop in the main mix output level. What makes the PM8 so special is that it offers a transparent active gain make-up stage (this requires the unit to be connected to mains power). This will result in the audio path to remain fully passive from input to output.
The SM Pro Audio PM8 can be used stand alone on your desktop, however it is best installed into two standard 19" (482.6mm) compatible audio rackmount unit spaces.
Inputs and Outputs
All inputs and outputs are secured firmly to the exterior chassis housing ensuring robust quality and confidence under all conditions
The SM Pro Audio PM8 can be used stand alone on your desktop, however it is best installed into two standard 19" (482.6mm) compatible audio rackmount unit spaces
The PM8 has a professional internal power supply suitable for operation between AC 110/115-220/230/240V. A voltage configuration switch on the left hand side of the rear panel should be set to match the appropriate voltage of your mains power supply
Power On/Off Switch & LED Power Indicator
The PM8's power switch can be found on the right hand side of the front panel. To enable power to the PM8, simply place the power on/off switch into the down position. The LED power indicator will illuminate to indicate the PM8's operational state as on and ready for operation
Analog Inputs - Combo, Input Link 25-pin D-sub
The PM8 features 8 x combo (XLR & TS) connectors and 1 x 25-pin (Input link) 8-channel D-sub
connector as channel input connectivity options. Typically you would connect the outputs of your digital audio workstation to your preferred input type
25-pin D-sub Input Link Connector
The 25-pin D-sub connector is wired in a standard Tascam/Digidesign pin configuration.
It allows for 8 channels of audio to be connected directly. This is extremely handy for users who have compatible hardware and can take advantage of the convenience of a single cable connection delivering 8 channels of audio
Analog Outputs - Passive Output, Master 1, Master 2
Passive output: This is provided for pure passive transparent mixing without any discernable audio coloration that electronic circuits can sometimes exhibit. Typically users will want to connect this output pair to a high quality 2-channel microphone preamplifier to help compensate for the inherent 20-30dB of signal strength lost during the passive attenuation and summing process.
Master 1: This output pair is a stereo balanced XLR pair delivering the summed signal of the 8 connected input signals. An internal electronic +24dB make-up gain stage is provided to help compensate for the inherent loss of signal strength during the passive attenuation and summing process. Volume attenuation is provided for these outputs via rotating the Master 1 volume attenuator on the front panel.
Master 2: This output pair is a stereo balanced XLR pair delivering the summed signal of the 8 connected input signals. An internal electronic +24dB 'make-up' gain stage is provided to help compensate for the inherent loss of signal strength during the passive attenuation and summing process. Volume attenuation is provided for these outputs via rotating the Master 2 volume attenuator on the front panel
Front Panel Controls and Indicators
Independent (8x) rotary volume attenuation controls: 8 x rotary volume attenuator knobs are provided for independent volume attenuation of the corresponding channel input signal. They allow precise level adjustments within 1dB from 0 to -40dB.
Independent (8x) led enabled mute switches: 8 x led enabled mute switches are provided for independent channel muting of the corresponding channel input signal. When depressed, the switch will illuminate to indicate channel mute status as on/muted. This is handy for the simple visual recognition of the PM8's channel mute status.
Independent (8x) rotary pan controls: 8 x rotary pan control knobs are provided for stereo positioning of the audio during the summing process. Simply rotate the knob to the left or right position while monitoring the stereo outputs as desired.
Master 1 & 2 Volume Attenuator Controls
Master 1 volume attenuator control: The Master 1 volume attenuator provides volume attenuation to the stereo summed signal appearing at both the Master 1 and Passive outputs. It offers precise level adjustments within 1dB from 0 to -40dB.
Master 2 volume attenuator control: The Master 2 volume attenuator provides volume attenuation to the stereo summed signal appearing at the Master 2 output. It offers precise level adjustments within 1dB from 0 to -40dB
General Use of the PM8
The PM8 is designed to mix the outputs of up to eight channels of audio signal from your DAW
(digital audio workstation). Two choices of inputs are available on the PM8. You can either use XLR or TRS standard cables to connect each channel individually to the PM8's combo inputs, or if you have a compatible Tascam or Digidesign configured multi-pin output device you can connect 8 source signals directly to the input link 25-pin D-sub connector.