Manley VOXBOX Tube Channel Strip (Open Box)


  • 2 Discrete Processors in One Unit
  • Hand-Wound Nickel Transformers
  • Hand-Selected Tubes
  • ELOP Compression and Limiting Circuits
SKU: 890833000175-1 Categories: , Tags: , , , ,

The VOXBOX Combo Tube Channel Strip from Manley Labs is a signal processor with mic preamp, compressor, EQ, and De-Esser/Limiter. While the unit can be used as a single input channel strip, it can also process 2 independent audio signals; one through the mic preamp/compressor and the other through EQ/De-Esser/Limiter. The original design idea was intended for vocal processing. However, the VOXBOX also excels at processing drums, guitar, bass, and stereo mixes.

The VOXBOX incorporates many of Manley’s technological innovations including the preamp from the Mono Mic Preamp, an electro-optical ELOP compressor, a Pultec-style mid-EQ, and a dedicated ELOP de-esser/limiter. The mic preamp features a hand-wound iron transformer with nickel laminations, negative feedback gain circuit, and triode vacuum tube circuit. The ELOP compressor is an electro-optical limiter with a fixed ratio of 3:1. The attack, release and threshold knobs adjust 4 different time constraints simultaneously resulting in “parametric compression,” which allows for a broad spectrum of professional results for any vocal, instrument, or mix bus signal. While other manufacturer’s designs have the compressor post mic pre, the VOXBOX places the circuit before the mic preamp making it near impossible to clip. This also shortens the signal path and ensures a quality, low noise signal.

The EQ section features Manley’s Pultec-style Mid EQ, a 3-band EQ (low peak, mid dip, high peak) with an extended frequency range covering 20 Hz to 20 kHz. The de-esser/limiter features another ELOP circuit with 4 notch frequencies to tame sibilance and a 5th setting to provide a LA-2A style limiter. This design allows for compression of the signal pre-EQ and limiting post-EQ. Another useful feature is the silent bypass switches, which allow for the engaging and disengaging of any circuit during recording or playback without any audible artifacts. The large VU meters offer a 5-way toggle switch for monitoring the line input, preamp output, final output, compression gain reduction, and de-esser/limiter action. Handmade in the USA, the unit is housed in a 3U steel chassis with a CNC machined 1/4″ faceplate that is also inlaid with laser engraved inserts. The VOXBOX ships with a standard IEC power cable.

Mic Preamp

  • Phantom 48 Volts: 48v power for microphones requiring phantom power
  • 3-way Toggle Switch for High Pass Filter: Flat (bypassed), 80, and 120 Hz
  • 3-way Toggle Switch for Phase Reverse and Line Selection: 0, line, and 180
  • 1/4″ 100 KΩ direct injection (DI) input for instruments
  • Mic Preamp Gain Switch: 40 to 60 dB of negative feedback gain
  • Input Level: Input attenuator or variable pad for mic, line, and DI


  • Manley ELOP circuit
  • Fixed 3:1 ratio
  • Continuously variable threshold control
  • 5-way Selection Knobs for Attack and Release: Fast, med fast, medium, med slow, and slow
  • Compress 3:1 Bypass: Silent bypass allows for discretely engaging the compressor during playback or recording
  • Link: Selects stereo operation of a second VOXBOX


  • Pultec style mid-EQ with extended frequency range
  • Low Peak Frequency: 11 position knob – 20 to 1000 Hz
  • Low Peak Boost: 0 to +10 dB
  • Mid Dip Frequency: 11 position knob – 200 to 7000 Hz
  • Mid Dip: 0 to -10 dB
  • High Peak Frequency: 11 position knob – 1.5 to 20 kHz
  • High Peak Boost: 0 to +10 dB
  • EQ In Bypass: Silent bypass switch allows for discretely engaging the EQ during playback and recording
  • EQ Input: 3-way toggle switch for selecting line input, preamp output, and insert return

De-Esser & Limiter

  • De-Ess Bypass: Silent switch for discretely engaging the de-esser during playback and recording
  • De-Ess Select: 5 position rotary switch for selecting de-essing frequencies
  • Limit: Setting removes frequency selection and works as an electro-optical limiter
  • Continuously variable threshold control

VU Meter

  • Full size illuminated Sifam VU Meter
  • 5-Way Switch: Line input, preamp output, EQ output, compressor gain reduction, and de-esser/limiter action

Additional Features

  • Auto-Mute Warm Up Delay: 30 seconds
  • Hand-wound Manley iron input transformer
  • Silent conductive plastic input attenuator
  • Magnetic field containment
  • Smart-grounding
UPC: 890833000175

Preamp Type: Tube Number of Channels: 1 Phantom Power: Yes EQ: Yes Compressor: Yes Other Processing: De-Esser Analog Inputs: 1 x XLR (Mic), 1 x XLR (Line), 1 x 1/4" (Line) Analog Outputs: 1 x XLR (Preamp), 1 x 1/4" (Preamp), 1 x XLR (EQ), 1 x 1/4" (EQ) Other I/O: 2 x RCA (De-Esser/Compressor Stereo Link), 1 x XLR (Insert Input), 1 x 1/4" (Insert Input) Frequency Response: 20Hz-20kHz Rack Spaces: 3U Height: 5.25 Depth: 10" Width: 19" Weight: 14 lbs.


Manley VOXBOX Tube Channel Strip Standard IEC Power Cable Limited 90-Day Warranty, Extends to 5 Years with Registration


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