Classic Recording Studio Equipment

Vintage Digital

TL Audio A4 Ebony Summer

TL Audio A4 Ebony Summer

The TL Audio A4 Ebony Summer was a discrete Class A 16x2 summing mixer featuring a Class A circuitry throughout its signal path, with fully balanced inputs and outputs.


The TL Audio A4 Ebony Summer was the latest addition to TL Audio’s newest range, the Ebony Series – a sleek looking range of black Discrete Class A Processors. The TL Audio A4 Ebony Summer is a 16:2 summing mixer housed in a 2U unit and features 16 balanced inputs on TRS and D-Sub with individual pan controls. All inputs are also switchable between +4 and -10 for greater flexibility.

The TL Audio A4 Ebony Summer uses top quality Discrete Class A circuitry throughout for a pristine signal path and a clean and precise sound. The Ebony Summer also boasts the clever ability to activate an optional tube stage on the master bus; once activated, you can simply dial in the exact amount of warmth you want from a dedicated dual triode tube stage – offering your recordings an unbeatable depth, warmth and finish in the way that only tubes can.

The addition of balanced insert points on the master bus section also means that you can patch in a stereo compressor / EQ (like the Ebony A2) and gain a complete professional mastering solution and back end to your system. Not only beautiful in appearance with its high gloss black finish, brightly lit VU meters and ‘alloy’ looking dials, but also in sound with its flexible options for clean and pristine to smooth, detailed and warm, it is also beautiful in it’s name and affordability, proving to be the most cost effective discrete Class A and tube summing solution on the market.


  • Discrete Class A Electronics
  • Dual Triode ECC83 tube stage in master section
  • Variable drive control
  • Ability to switch tube in and out of circuit path
  • 16 Balanced inputs on TRS / D-Sub
  • 16 individual pan control
  • Inputs switchable +4/-10
  • Balanced inserts on master bus
  • Balanced outputs
  • Analogue VU metering with Peak LED’s
  • Sleek design and smooth precise sound
  • Rackmountable (2U)
  • Hand Made In England



  • Outputs: Balanced, via 3 pin XLR connectors. Nominal level +4dBu or -10dBu.
  • Maximum Level: +26dBu, Input to Output @ 0dB gain and +4dBu nominal level.
  • Frequency Response: +0, -1dB, 10Hz to 25KHz.
  • Distortion:
    • 0.012% at 1KHz.
    • 0.05%, 20Hz to 20KHz.
    • (At +4dBu input and output and 0dB gain, tube stage out).
  • Hum and Noise: -83dBu unweighted, at 0dB gain and +4dBu nominal level. VU Meters: Illuminated moving coil, 0VU = +4dBu (or -10dBu).
    “+10dB” switch shifts 0VU to +14dBu (or 0dBu).
  • Dimensions: 483mm x 220mm x 88mm
  • Shipping weight: 6kg


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Nice but…

by John McPhearson

Sound Quality 90%
Build Quality 90%
Usefullness 80%
Mojo/Funk 50%
Reliability 70%

I bought this box to do a mix ‘in the box’ and had hopes it would add something to the mix, but it did not add anything significant that I could notice. It was a reasonably well made box and looked good in the rack, but it did not take long for one of the meters to no longer light up, which I believe is common for TL Audio. I also had a Symetrix summing box which I felt did just as little to be honest. I get more of the summing effect I want by using Harrison Mixbus to do my mixes if I am totally honest.

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