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Reference Tube Channel Strip


It looks awesome, but what is it?

Primarily, it is a voice processor which in itself is not a novel idea, but the time had come to pull out all the stops and make a truly professional high-end statement. One that covered the needs of the project songwriters and big-time major studios alike. One whose all-tube signal path could bring every instrument and overdub to life. One that, plain and simple, sounded unquestionably better than the rest, provided flexibility, simplicity, and well thought-out ergonomics. Full of features, timeless style, robust build quality, and that world-famous "Manley Sound", we present to you the MANLEY VOXBOX®


That's nice. What's it good for?

While we were designing the VOXBOX® we couldn't help but notice how well it works on other instruments besides voice. There are some great settings for drums, bass, guitar, and keys and the two separate sections can be used together or independently. Stereo using two VOXBOXes? You know we couldn't resist planning for that as well. There are Stereo Links for both the compressor and the De-Ess/Limiter sections, special compression settings and super-sweet EQ frequencies for your mix or pre-mastering. So don't just use it for voice. The name "VOXBOX®" represents only the beginning...



The preamplifier is a clone of a highly regarded and popular mic pre: the Manley Mono Microphone Preamplifier! The mic input transformer is our own design wound in-house at the Manley Labs factory. High current 48V Phantom power is switchable from the front panel. A simple and effective passive BASS CUT switch kills rumble and reduces popping. The INPUT ATTENUATOR is a variable pad control situated before the first tube stage allowing the preamplifier to accommodate +4 line level signals via the balanced LINE INPUT and instruments via the front panel 1/4" DIRECT INPUT. These inputs are selected in the middle position of the dual-function phase invert switch. We provide both transformer balanced XLR output as well as a transformerless "audiophile" 1/4" phone jack output. The Gain switch is actually a clever variable feedback control that changes not only the gain but the slew rate and flavour of the circuit. With it you can choose how laid back and mellow or how up-front and aggressive you want it to get. See "Notes on Variable Feedback" for more info. Headroom is a strong point in this circuit, +31dBu capable. This is 5 to 10 dB better than almost all other pro gear. The music passes through only our super-clean pure Class A vacuum tube circuitry. There are obvious advantages to our purist approach and foremost is the un-electronic final sound that carries emotion into the digital realm.



This cool compressor design takes our opto-isolator approach of the Manley ELOP® Limiter to the max. We adjusted the Ratio down to 3:1 to turn our ELOP into a compressor and added ATTACK and RELEASE controls for more versatility. What is clever is how the signal is compressed before it hits the tubes with no detrimental effect on distortion or frequency response. This way, it can prevent mic-pre clipping and eliminate whole stages of electronics. This cuts the typical path of mic to tape in half! We also pioneered new thinking in the sidechain by using up to four different time constants simultaneously and controlling them with familiar simple attack, release and threshold controls. We call the approach "Parametric Compression". We developed optimum settings or presets based our favorite Vactrols that we use in our own fast ELOP® Limiter, the quick LA-2A's T-4 module, the slower LA-3A and then created more complex special settings. This extended range and method of timing delivers fresh sounds from powerhouse punching drums to super-solid bass yet can also emulate the way good engineers delicately ride a fader while recording. It is transparent and liquid-smooth on vocals, easy to use and accurate. Also rare for an opto-based dynamic processor, this compressor works great on mixes. Of course, you'll be needing two VOXBOXes linked in stereo...



Lots of folks requested that we include the Pultec Mid Frequency Equalizer in the VOXBOX®, but they wanted MORE.... Now we've extended it to 33 frequencies in 3 bands with 6 new frequencies from 20 Hz to 150 Hz, and 6 more in the highs from 6.4 KHz to 20 KHz. Ever notice that only EQs with real inductors have the bottom end magic or that only Class A circuitry can keep the top end sweet? This is for you. The EQ INPUT switch patches in the Line Input, Preamp Output, or the INSERT return. This switch serves double-duty acting as a bypass switch for the preamp and/or external processors or for processing two different tracks.



Designed by folks with admittedly large gaps between their two front teeth, (Hutch and EveAnna) the VOXBOX® combo also includes a de-esser & peak limiter based on our original ELOP® Limiter design but with an added passive LC network to handle the de-essing four carefully chosen notch frequencies from 3KHz to 12KHz. (That 3KHz setting really tames those annoying frequencies!) The fifth position gives you a limiter which totally mimics the famous LA-2A. This means you can both compress pre-EQ then limit here post-EQ. Another cool feature is the ability to insert this de-esser silently and smoothly as the music plays, using it as needed.



The METER is a full size illuminated Sifam VU meter. A five-position switch shows three audio levels: the line input, the preamp output and the final output. It also shows compressor gain reduction and the de-esser/limiter action. Other clever innovations incorporated into the VOXBOX® combo include warm-up muting circuitry, extensive magnetic field containment, 'smart -grounding', and silent switching. The sum-total is more than the separate parts: consider the reduced patching, the short path to tape and you having this much immediate control. As engineers, we choose what we use not based entirely on features and functions - there is a sound, a texture we reach for and the VOXBOX® combo puts the 'Manley Sound' together with 'Your Sound'.

- MANLEY transformers w/nickel laminations in mu-metal cases

- 2 kOhm MIC INPUT Z w/High current 48V Phantom power built-in

- Hi-Z (100K) Direct Instrument Input

- LINE & INSERT INPUTS (balanced XLR & 1/4")

- PREAMP & EQ outputs LO-Z (50 Ohms)

- Transformer balanced XLR outputs

- Transformerless unbalanced 1/4"outputs

- STEREO LINK for Compressor & De-esser/Limiter


- Large ILLUMINATED Sifam METER with FIVE readout modes

- THD + N (1KHz @ +20 dBu): 0.3%

- Maximum output: +31dBu


Two Independent Sections: MIC PRE EQ
Frequency Response ±1dB 20Hz - 60KHz 10 Hz - 100KHz
Noise Floor (A-wgt) -86 dB -89 dB
Signal to Noise Ratio 113 dB 116 dB
Tube complement 12AX7LPS & 6414 5751 & 6414
Gain 40 to 60 dB unity
Two Separate Processors: COMPRESSOR DE-ESSER & LIMITER
Ratio 3:1 10:1
Maximum Reduction 16 dB 32 dB
Attack Times 4mS to 70mS 2mS
Release Times .3, .5, 1, 2, 5 Sec .5 Sec
De-Ess Notch Frequencies   3, 6, 9, 12KHz, none (LIMIT)
General Info:
Power Consumption 24 Watts  
Mains Voltage Frequency 50~ 60Hz  
Dimensions 19" x 5.25" x 10" occupies 3U
Shipping weight 21 lbs.


NOTE: Operating mains voltage:

Units are purpose built for original destination country's mains voltage: 100V, 120V, or 220-240VAC as indicated on the serial number badge. Power transformer must be replaced in order to change mains operating voltage.

120VAC units may NOT be rewired to put the primaries of the power transformer in series for 220-240V operation or a large radiated field of hum will develop. If changing locations/voltages, the power transformer must be replaced with the dedicated one for the voltage at which it will operate.





it does what it says it does and it does each thing really well. It’s beautifully built and is clearly in every way a highly professional and well thought out piece of gear

Recording Magazine

Read the complete review here



This box would be a joy in any studio. As I write this review, I already miss the sound it gave me

Digital Pro Sound

Read the complete review here



This is obviously a feature-laden unit, but how did it sound? In eight words: just about any way you want it to!

...I will have to add the Manley Voxbox to the collection of equipment already filling up my control room's racks...

Pro Audio Review

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Due to its excellent sound, its flexibility and versatility, the Manley can be a powerful tool that outperforms many other high quality single use components that have similar price tags

Audio Media

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The VoxBox name implies a vocal tracking tool, but its Pultec EQ, de-esser and limiter are equally welcome at any mixing date. And besides being a lot of fun on miked instruments, the direct input was equally handy on bass, while my Gibson J-160E electro-acoustic never sounded sweeter. Hey, I could get to like this one--there's nothing like going first-class.

Mix Magazine

Read the complete review here

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