SPL Channel One Model 2950

Single channel tube preamp with de-esser, compressor/limiter/noise gate, EQ, and headphone amp
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SPL Channel One Model 2950 Digital/Analog Transistor/Tube Channel Strip


The Channel One comes with all tools onboard for recording voices, instruments and digital or analog audio sources with the highest sound quality:

  • Transistor/tube preamplifier
  • SPL's De-Esser
  • Compressor/limiter with noise gate
  • EQ section
  • Headphone monitor
  • Options: 24/96 A/D converter, Lundahl I/O transformers

Each stage contributes to the concept as the ideal recording frontend for world-class sounds the easy way: intelligent automation ensures both intuitive and fast as well as musical operation for the finest recording results.
The preamp stage provides three optimized inputs:

  • The microphone input features 48V phantom power, phase reverse function and a subsonic filter.
  • The low-impedance Line input has a precise balancing stage for connecting studio equipment.
  • The low-noise, high-impedance instrument input is easily accessible on the front panel.



The renowned SPL De-Esser subtly yet effectively removes offending sibilants by reliably eliminating only the "S" frequencies with its unique phase-canceling processing technology. Auto-Threshold ensures constant processing even with varying microphone distances. All you need do is to turn the knob until the sibilants are gone.

Insert (Send/Return)

The Insert (Send/Return) allows for insertion of external processors or can be used to record the pure preamplifier signal.


This section is based on SPL's Double-VCA-Drive circuitry for outstanding noise and distortion characteristics. The compressor is extremely easy to use via a single knob. But the signal-dependent automation not only allows for set and forget operation, it also grants very musical results in any situation. Actually it is much more difficult to destroy a recording with wrong compression settings.

Noise Gate

The noise gate operates flawlessly - reverbs are recognized and not cut off.

Three band EQ

The Channel One provides a new EQ design especially optimized to process vocals, acoustic and electronic instruments. Low, Mid Hi, and Air-Bands allow for both corrective adjustments and/or effective sound designing processing. Gadget: a distortion control might be useful sometimes to apply for decent distortions to signals that deserve it.

Headphone monitor stage

Provides an individual mix for the singer/speaker - latency problems from digital systems are avoided.




Microphone input

  • Frequency response 10 Hz-100 kHz (100 kHz = -3 dB)
  • Common mode rejection (@ -20 dBu) 1 kHz:
  • -80 dB / 10 kHz: -78 dB
  • THD & N Gain: A-weighted
  • 20 dB -97.1 dBu
  • 40 dB -91.1 dBu
  • 65 dB -69.4 dBu
  • Dynamic range 118 dB


Line/Instrument input

  • Frequency response 10 Hz-180 kHz (100 kHz = -3 dB)
  • Common mode rejection (@ 0 dBu) 1 kHz:
  • -80 dB / 10 kHz: -78 dB, Line input only
  • Total harmonic distortion Gain (A-weighted):
  • 5 dB -99.4 dBu
  • 20 dB -97.2 dBu
  • 42 dB -79 dBu
  • Input impedance Line: 20 kOhm / Instr.: 1 MOhm
  • Max. input level Line: +22 dBu / Instr.: +14 dBu
  • Dynamic range 119 dB


Output data

  • Max. output level XLR/jack +20 dBu
  • Output impedance 50 Ohm


Power supply

  • Toroidal transformer 20 VA
  • Fuses 315 mA (230 V/50 Hz)
  • 630 mA (115 V / 60 Hz)



  • Standard EIA 19"/IHE 482 x 88 x 210 mm
  • Weight 4.15 kg


Optional Upgrades

  • 24bit/192kHz A/D Converter ($200)
  • Mic in Lundahl transformer ($219)
  • Line out Lundahl transformer ($179)
More Information
Manufacturer SPL
Condition New
Model 2950
Type Channel Strip
Features Solid State
Number of Channels 1
Type Channel Strip
Bundled No
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