Speck Electronics -X.Sum Line Mixer

Mix it - Group it - Combine it - Blend it - Sum it

The X.Sum design takes you beyond the simple “hard-left” or “hard-right” summing box, and gives you 16 stereo input channels with level, pan, mix assign and mono select.

Closeup View

If you need more than simple summing, then you need the X.Sum.

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.

The In's & Out's

Features

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.

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.

Multi-purpose I/O connector.

Expandable to 128 inputs.

Breakout Box & Expander cables-
·	Combo breakout for Mix-B and Mix-A outputs.
·	Cables to link 2, 3, or 4 X.Sum's.

Rear Closeup View

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.

Breakout Box Details

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.

Specifications

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)

X.Sum and 500 Series mixing
system application
(700K PDF)

X.Sum Signal Flow Diagram
(347K PDF)

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 30 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 XTRAMIX rack mixer, the ASC equalizer, and MicPre 5.0 preamp.

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