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Channel Master Pre-Amp & Input Processor $0.00
Aphex Warranty  |  Aphex List Prices

Channel Master Pre-Amp & Input Processor
Click to enlarge

Product Details

With more and more studios foregoing consoles in favor of recording and mixing in the computer, a clean and versatile front end input stage is indispensible. There are dozens and dozens of channel strips and similar devices to choose from, but none that come close to the Channel by way of sound, features or performance.

The legendary Model 230 has been re-imagined, adding a host of new features to address a greater number of workflows while retaining the sound, functionality and versatility that made it one of the most in-demand processors ever for professional audio, live sound, broadcast and post production.

The Channel incorporates seven powerful devices within a compact, single rack space design, including five of Aphex’s exclusive patented technologies. Together, the result is the highest possible audio quality, processing power and flexibility available.

The elegant front panel not only looks great, but is laid out in an intuitive, easy-to-use workflow with easy to understand labeling. Building on the foundation of the Model 230, the Channel features an instrument input, dedicated output and gain reduction metering, front panel sample rate and clock source selection, and a reference quality internal clock.



The Aphex Channel is a Tube Microphone Preamp and signal processor that is an indispensable broadcast station tool. You'll find them in the production room and installed as a permanent on-air processing for pumping up voices.

Recording Studios

The Aphex Channel is a powerful and easy-to-use channel strip for commercial and project studios, featuring our reflected-plate amplifier tube microphone preamp design plus compression, gating, de-esser, parametric EQ, Aural Exciter, and Big Bottom bass enhancement. It is an extraordinary single rack unit that offers 7 of Aphex’s most popular tools that help you work more easily and naturally, achieving the sonic quality you want without connecting several devices.

Live Sound

When space is at a premium in a touring rig, and night after night reliability is essential, the rugged Aphex Channel provides all the top quality processing needed for any instrument without taking up precious rack space.


Patented Reflected Plate Amplifier (RPA) Tube Preamp
  • Ultra-wide bandwidth, maximum gain and headroom
  • Lower operating temperature than conventional tube designs for longer tube life
  • Each unit is individually tuned at the Aphex factory for unparalleled consistency – any two units are a matched pair

  • EasyRider Class A Compressor
  • Aphex’s patented Wave Dependent Compressor – automatically adjusts attack and release times according to program complexity
  • No-Knee compression curve circuitry – automatically adjusts compression ratio based on program levels
  • Includes Aphex’s 1001 Class A Voltage Controlled Attenuator, used in the Compellor and Dominator

  • Logic Assisted Gate
  • Patented gate technology designed to avoid false triggers, clicks and chattering

  • De-Esser
  • Split band universal de-esser designed to maintain presence while dramatically reducing sibilance on any voice

  • Big Bottom
  • Patented technology for deeper and more resonant bass with little or no increase in peak output

  • Parametric EQ
  • For the ability to precisely fine tune the all-important midrange between the Big Bottom and Aural Exciter.

  • Aural Exciter
  • Patented technology for increased presence and clarity with improved detail and intelligibility

  • Product Specifications
    Connector: XLR-3F
    Type: Transformerless, NPN active balanced, tube second stage
    Input Z: 2k ohms nominal
    Maximum Input Level (MIL): +25dBu
    CMRR: >70 dB @ 60 Hz
    Nominal Preamp Gain: 20 to 65 dB
    Phantom Power: +48VDC
    Pad: 20dB
    EIN: -127dBu (Input Shorted)
    Tube Type: 12AT7/ECC81 Dual Triode

    Connector: XLR-3M and 1/4" TRS Phone Jacks
    Type: XLR is Impedance Balanced (may be used unbalanced); TRS is unbalanced
    Out Z Balanced: XLR 66 ohms
    Out Z Unbalanced: XLR 33 ohms; TRS 600 ohms
    Nominal Level: XLR +4dBu; TRS -10dBV
    Maximum Output Level: +25dBu Unloaded; TRS +11dBV

    Attack / Release: Program dependent, user variable release baseline
    Ratio: 4:1
    Threshold: Fixed
    Knee: Medium Hard
    GATE Attack: 0.1 millisecond
    Hold / Release: 300 milliseconds / 400 milliseconds
    Threshold: Variable -50 to +20dB
    Depth: Variable, 1 to 58dB

    Attack: 0.1 millisecond
    Release: 100 milliseconds
    Threshold: Variable -20 to +20dB
    Ratio: 5:1
    Active Band: 4 kHz to 20kHz Linkwitz-Riley 24 db/octave crossover

    Connector type - Send: 1/4” TRS Phone Jack, Balanced
    Connector type - Return: 1/4” TRS Phone Jack, Balanced
    Nominal Operating Level: 0 dBu
    Point of Insertion: Between dynamics processing and equalizers

    Frequency: 50 Hz to 280 Hz
    Tune: Off to +12dB
    PARAMETRIC EQ Frequency Tune: 240 Hz to 8 kHz
    Peak / Dip: ±12dB
    Q Range: 0.5 to 5
    AURAL EXCITER Frequency Tune: 500 Hz to 5kHz
    Mix: Off to +12dB

    Freq Response (Flat): 18 Hz to 24kHz ±1dB

    Internal Sample Rates: 44.1KHz, 48KHz, 88.2KHz, 96KHz
    External Sample Rates: Automatically syncs to any word clock between 32KHz and 96KHz
    Resolution 24 bits
    Word Clock Input: BNC Jack, High Z, Captures
    Word Clock Output: BNC Jack, 75 Ohms, 5Vp-p
    Dynamic Range: Digital dynamic range greater than analog front end
    Noise Dither: Dithered by analog preamp noise floor. Equivalent to 16-bit digital audio dither.
    Level Equivalency: -20dBFS Digital = +4dBu Analog

    Power requirements: 90-250 VAC 50-60 Hz 12W
    Dimensions: 19"W x 1.75"H x 8.25" D 1 Rack U (482.6mm x 44.5mm x 209.6mm)
    Depth Behind Front Panel: 7.5" (190.5mm)
    Net Weight: 6 lbs (2.73 kg)
    Shipping Weight: 9 lbs (4.1 kg)

    Product Weight
    Net Weight: 6 lbs (2.73 kg)
    Shipping Weight: 9 lbs (4.1 kg)

    Product Dimensions
    19"W x 1.75"H x 8.25" D 1 Rack U (482.6mm x 44.5mm x 209.6mm)

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