Speck Electronics X.Sum - Manual (Page 17)

Chapter 3 Operation Section 13
Input Channel
1 3
4 2
The smaller (inner) knob of the black capped concentric is a dual rotary
potentiometer that simultaneously and equally adjusts both the left and right
channel levels.
The 0dB mark is the "unity gain" setting for the input channel. There is 12 dB
more gain available past the “0db” mark.
It is recommended that the input channel be set to this "0dB" mark when the
X.Sum is being used exclusively as a summing box.
The larger (outer) knob of the black capped concentric pot used in conjunction
with the input level control [1] and Mix Assign Switch [3] allows an input
channel to be panned to either the Mix-A or Mix-B outputs.
When an input channel is operated in the stereo mode, this control acts as an
odd/even (left/right) balance for the selected subgroup pair. If the channel is
operated in the mono mode or has a mono source connected to the Left/Mono
input jack, then this control acts as a traditional pan.
The Mix Assign Switch allows an input channel to be assign to the Mix-A or
Mix-B left/right outputs. A red L.E.D. indicates that the channel has been
assigned to the Mix-A outputs.
When the mix switch on any channel is in the "out" position, the channel's
stereo signal is routed to the Mix-B stereo outs. When the mix switch is
depressed on any channel, its stereo signal is routed to the main Mix-A
outputs. This function is on a per-channel basis so you can have some of the
input channel's assigned to the main stereo Mix-A and others to Mix-B.
When depressed, this switch sums the left and right signal together. The
summed left/right signal can be panned using the pan pot. A yellow L.E.D.
indicates the operation of the Mono switch.
1. Input Level Control
3. Mix Assign Switch
2. Input Pan/Balance
Control
4. Mono Select Switch