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Speck Electronics X.Sum Mixer  From Speck

16 Stereo Channel Summing Line Mixer

Speck Electronics


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Manufacturer's Description from Speck

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 that routes input channel to the main stereo mix or Mix-B stereo mix.

Mono Switch.

Left and right balanced TRS inputs.

    Master Section

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.


The Designer
The X.Sum is the work of Vince Poulos, the designer and owner of Speck Electronics.

Speck Electronics has been producing quality professional audio products for over 35 years.  Founded in 1973, Speck Electronics has consistently provided innovations in audio products for all segments of professional recording and touring.  Other products include the LiLo mixer, the ASC equalizer, and MicPre 5.0 preamp.

Speck Electronics

About Manufacturer

Speck Electronics has been producing quality audio mixers, equalizers, and preamps for all segments of professional audio recording and touring for over 25 years. Our products include the Xtramix compact audio mixer, the Model ASC equalizer, and MicPre 5.0 microphone preamp. Our future goals are to expand our product line with analog hardware complementary with the current line of DAW's and Desktop Recording.


Frequency Response (12 dB gain)
3Hz-54kHz (+0/-.5dB)

THD+n (Gain 12, Output +24dBu)

Noise (22Hz-22kHz)
-102dBu (Residual output noise)
-87dBu (16 channels routed, faders off)

Maximum Input Level

Maximum Output Level

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)





X.Sum Signal Flow Diagram