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Aphex 230 Master Voice Channel Tube Mic Pre

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The Aphex 230 Master Voice Channel Tube Mic Pre is an indispensable broadcast station tool. Youll find them in the production room, or installed as a permanent on-air feed-through for pumping up voic... Click To Read More About This Product

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The Aphex 230 Master Voice Channel Tube Mic Pre is an indispensable broadcast station tool. Youll find them in the production room, or installed as a permanent on-air feed-through for pumping up voices. The Aphex 230 also makes a powerful and easy-to-use channel for home and project studios with its reflected-plate amplifier tube mic preamp design plus compression, gating, de-esser, parametric EQ, aural exciter, and a bottom booster.


  • Reflected-plate amplifier tube mic preamp
  • EasyRider compressor
  • Logic assisted gate
  • Split-band de-esser
  • Aural exciter
  • Parametric EQ
  • Big bottom
  • +4 dBu and -10 dBV outputs
  • 24-bit 96 kHz A/D
  • AES, SPDIF and optical outputs
  • Low jitter word clock output
  • Word clock input
  • Cough switch (soft mute)
  • Connector XLR-3F
  • Type Transformerless, NPN active balanced, tube second stage
  • Input Z 2k ohms nominal
  • Maximum Input Level (MIL) 20k ohms
  • 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
  • Frequency Tune 240 Hz to 8 kHz
  • Peak / Dip ±12dB
  • Q Range 0.5 to 5
  • Frequency Tune 500 Hz to 5kHz
  • Mix Off to +12dB
  • THD <.01% @ +4dBu Out
    IMD <.01% @ +4dBu Out
    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 <1Vp-p to 5Vp-p
    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)
Pro Coverage
Manufacturer's Warranty
One year parts and labor warranty.

  • Customer Reviews

Review Snapshot

by PowerReviews
Aphex230 Master Voice Channel Tube Mic Pre

(based on 2 reviews)

Ratings Distribution

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  • 1 Stars



Reviewed by 2 customers

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(5 of 8 customers found this review helpful)


Not bad. Not good.

By Chris Geo

from Dallas, TX

Comments about Aphex 230 Master Voice Channel Tube Mic Pre:

Noticeably better than the preamp on my MOTU but not really ideal for vocals. The big bottom would be great for radio broadcasts and what not. I thought it would help phatten up my rapping voice but I was mistaken. There is no way to cut the lows other than the low cut switch which is already activated and I STILL get too much low end on my vocals. Female vocals I've recorded have come out pretty clean because of the lack of low end in their voices but not good for male vocals. My other complaint is the compressor uses the gain to set the threshold but having the compressor on in ANY setting causes WAY too much compression. Maybe it's because it's automatically set to 4:1 and there is no way to change it. Because I am considering starting an internet radio show I don't regret this purchase completely but I wouldn't buy into the hype that it's good for vocals. The deesser is OK but seems to kill the vocals and deessing is better done in Cubase with a Waves R-Dess. I believe what Aphex boasts about this unit is ultimately their weakness which is simplified controls all the way around. You NEED a free threshold on the comp, a free attack on the comp and more control over the desser and the EQ in order to be effective. Otherwise you get a generic sound that is not finely tuned. After owning it and using it for a year and with my album set to come out in about 70 days I'm going to buy the Avalon today and pray that business keeps going well so financial hit doesn't totally screw me. It all comes down to pride in your music I guess. With a superclean instrument track, there is no excuse for vocals to sound less than perfect too. My advice. Pony up a few hundred bucks more (or even another thousand) and get something other than the Aphex if you're recording music. It's a great piece of equipment and solidly made. It's just not right for my particular application.

(0 of 1 customers found this review helpful)


Aphex 230 Preamp

By M. Keske, Executive Producer

from Irvine, CA

Comments about Aphex 230 Master Voice Channel Tube Mic Pre:

A superior piece of equipment that meets all expectations, the Aphex 230 Preamp is now in use in recording radio segments of Digital Computer Talk with Benjamin Rockwell.

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