The SSA 2A is a stereo summing amplifier from Tube Tech that performs summing of up to eight stereo pairs of input channels down to a single stereo output. The unit also has four mono inputs ready for hard-center panned tracks such as kick, snare, bass and lead vocals.

Many users of Digital Audio Workstations (DAW) have experienced dissatisfaction with the internal digital summing of their systems. Providing the best of both digital and analog worlds, summing amplifiers can provide a more open, clear and punchier sound, allowing the mix to sounds like it was done on an expensive analog console.

The SSA 2A is a symmetrical two-stage amplifier, designed around two dual, low impedance and high transconductance triodes. The input transformer is part of the dual feedback configured as a so-called zero field transformer. The output stage is designed around two dual triodes in push-pull and an output transformer (with a static screen.) Both the summing amplifiers and the output amplifiers are symmetrical.

Type Active
Inputs 20 x XLR
Outputs 2 x XLR
Inserts No
On-Board Processors No
Gain Control Yes
Gain Range -10dB to +10dB
Maximum Output Level +26dBu
Frequency Response 5Hz to 100kHz, @ -3dB
Noise All inputs, +10dB: <-75dBu (22Hz to 22kHz)
Dimensions (WxDxH) 19" x 8 1/8" x 3 1/2"
Weight 11.9 lbs
Specialties Dual VU meters for displaying output level

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