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SPL Kultube:

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The SPL Kultube stereo audio compressor for recording studios includes discrete solid state gain cells, selectable signal dependent automation, adjustable tube saturation, a decompressor, and more.

The Kultube is an extremely versatile compressor with a broad range of control facilities that cover all typical compressor applications. From improved stereo mixes in the "MIDI Studio" to surround mastering with several devices connected, all jobs can be undertaken to the highest degree of sound quality. You can, for example, choose between the hard and soft-knee characteristics and insert external devices via a side-chain input for external control. With the unique "Progressive Time Control" for attack and release, time constants can be optimized by unique circuitry that reacts both to the input signal and to the user settings. In master/slave mode, any number of devices can be controlled from one master unit.

The adjustable tube saturation of the output stages combined with automatic output level adjustment can produce tube sound effects that range from the delicate to the raucous whilst a useful decompressor mode can reanimate over compressed material (such as samples). The Kultube user has a unique range of powerful compression tools always available, from subtle unobtrusive compression to very obvious 'effect' compressions - it's all possible. Used conventionally or as an effect, in the MIDI and project studio or in the professional studio, the Kultube delivers outstanding audio quality with SPL's acclaimed musicality and user-friendliness.

Applications cover those of a classic compressor for vocals and instruments, in both mono and stereo, through to stereo operation for subgroup processing, stereo mastering, multi channel or surround projects.

Gain Cells

SPL has developed discrete, very high performance gain cells that are used instead of the usual VCAs and the Kultube is the first product to use them. They ensure the highest level of musicality and clarity in signal processing and demonstrate significantly improved distortion values over VCAs.


"Progressive Time Control": user optimization of attack and release times that work in conjunction with the unit's signal responsive circuitry to provide the best attributes of manual and auto compressors at the same time.

  • Adjustable tube saturation with output level adjustment
  • Selectable soft or hard knee characteristics
  • Unique decompression mode
  • Large VU meter displays gain reduction or (mono summed) output level
  • Switchable side-chain inputs on the front panel
  • Slave mode for multi channel operation


  • Frequency response (100 kHz = -3 dB):
    10 Hz-100 kHz
  • Common mode rejection (at 0 dBu):
    1 kHz: > 75 dB
    10 kHz: > 65 dB
  • THD & N (at 0 dBu):
    > 83 dB
  • S/N (A-weighted):
    90 dBu
  • Input impedance Line:
    20 kOhm
  • Max. input level Line:
    +22 dBu
  • Max. output level XLR/jack:
    +24 dBu
  • Output impedance:
    50 Ohm
  • Power supply
    • Toroidal transformer:
      30 VA
    • Fuses:
      400 mA (230 V/50 Hz)
      800 mA (115 V/60 Hz)
  • Dimensions
    • Stand.-EIA-19 inch/2U housing:
      482 x 88 x 210 mm
    • Weight:
      4.3 kg

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