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Speck Electronics X.Sum Line Mixer w Breakout Box

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The X.Sum is a 32 x 4 line mixer that can be used for external DAW summing or as a line mixer for synths, samplers, and effect returns. Any of the 16 stereo channels can be assigned to either the main stereo Mix output or the stereo Mix-B output.

Connect the X.Sum to virtually any line level source: balanced, unbalanced, transformer, or transformer-less. The  X.Sum has high headroom that will handle balanced signals up to +28dBu. All audio inputs and outputs are fully balanced and available on TRS connectors.

Looking a bit closer at the rear panel, you will notice a Multi-function I/O connector. This connection increases the functionailty of the X.Sum's inputs and outputs.

The X.Sum includes an external breakout box that adds connectors for the Mix-B outputs and "Pre" Mix-A outputs. The left/right "Pre" Mix-A outputs bypass the X.Sum's master section so you can use your own external preamps to add character and color to your mix.


  • 16 Stereo Line Inputs
  • Stereo Level Control
  • Pan/Balance Control
  • Mix Assign Switch
  • Mono Switch
  • Left and Right Balanced TRS Inputs
  • Master Level Control
  • Stereo/Mono Switch
  • Monitor/Phone Level Provides Adjustment to Headphone Jack and Mix-B Output
  • Balanced TRS Stereo Mix Output
  • Expandable to 128 inputs
  • Frequency Response (12 dB gain)
  • 3Hz-54kHz (+0/-.5dB)
  • THD+n (Gain 12, Output +24dBu): .0024%
  • Noise (22Hz-22kHz): -102dBu (Residual output noise)
  • -87dBu (16 channels routed, faders off)
  • Maximum Input Level: +28dBu
  • Maximum Output Level: +28dBu
  • Input Impedance: 30K Ohms (Balanced); 15K Ohms (Unbalanced
  • Output Impedance: 60 Ohms
  • Dimensions (Mixer): WxHxD=1.75" x 19" x 10.75" (44mm x 483mm x 273mm)
  • Dimensions (Power Supply): WxHxD=4.6" x 2.75" x 7.3" (117mm x 70mm x 185mm)
  • Shipping Weight (Mixer & PS): 15 Lbs (6.8kg)
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