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SPL Kultube Stereo Compressor  From SPL

Enflame your mixes with this awesome stereo compressor with tube harmonic control!


Manufacturer's Description from SPL

The Kultube is a stereo 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.


  • Stereo compressor with discrete, Class A gain components (instead of industrial VCAs)
  • Single track or subgroup/summed signal processing in studio and live recording
  • Stereo and multi-channel applications 
  • Achieve massive attacks and increased loudness without side-effects
  • Progressive Time Control: interactive automation of attack and release times, the permanent reaction to the input signal ensures musical perfection (no fixed automation presets)
  • Adjustable tube saturation with automatic 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
  • Options: 24/192 AD converterI/O transformers from Lundahl
  • Made in Germany


The Kultube user has a unique range of powerful compression tools always available, from subtle unobtrusive compression to very obvious ‘effect‘ compressions. Used conventionally or as an effect, in professional recording or mastering applications, the Kultube combines outstanding audio quality with the acclaimed musicality and user-friendliness that SPL units stand for.
Applications cover those of a classic compressor for vocals and instruments, in both mono and stereo, through stereo operation for subgroup processing to stereo mastering and multi-channel/surround projects.


Progressive Time Control

With the unique Progressive Time Control (PTC) option for attack and release, time constants can be optimised by unique circuitry that reacts both to the input signal and to the user settings - for example, fast impulses are intercepted by an attack time as fast as 20 us. PTC can be seen as an interactively controllable automation which is not based on fix presets but reacts to the audio material in a musically useful way.


Discrete 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.


Tube Harmonics

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 overcompressed material (such as samples).


Master/Slave Modes

In master/slave mode, any number of devices can be controlled from one master unit.


About Manufacturer

Sound Performance Labs! Full Range of Analog, Tube, and Digital rack gear with an innovative twist. With their most famous transient designer product, SPL has quickly become a household name in both the recording and live sound arenas.


Frequency response (100 kHz = -3 dB): 10 Hz-100 kHz

THD & N (at 0 dBu): > 83 dB

S/N (A-weighted): 90 dBu

Input impedance: 20 kOhm

Max. input level: +22 dBu

Max. output level: +24 dBu

Output impedance: = 50 Ohm

Common mode rejection (at 0 dBu):
1 kHz: > 75 dB
10 kHz: > 65 dB

Power supply
Toroidal transformer: 30 VA
Fuses: 400 mA (230 V/50 Hz) / 800 mA (115 V/60 Hz)
Maximum power consumption: 40W

Standard-EIA-19 inch/2U housing
W x H x D: 482 x 88 x 210 mm; 19" x 3.46" x 8.27"

Weight: 4.3 kg, 9.5lbs


0dBu = 0.775V. Subject to change without notice.