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UAD Manley VoxBox Review

Today Universal Audio launched version 8.7 of their UAD-2 plug-in software including new plug-ins including the Unison powered UAD Manley Voxbox, Universal Audio's third emulation of a Manley piece of outboard.

UAD Manley VoxBox Review

As the name suggests the UAD-2 Manley Voxbox is an emulation of the superb Manley Voxbox all-valve channel strip and features Universal Audio's Unison technology for UAD Apollo audio interfaces, which allows the precise emulation of the input gain stage, impedance load and more for an even more realistic result.

About the VoxBox

Visually similar to the original hardware it emulates, the UAD Manley Voxbox comprises a preamp section, a compressor, de-esser/limiter and a three-band passive EQ.

Unlike most other channel strips, the compressor stage is located just after the input stage, before the preamp gain. This guarantees a more consistent level reaching the valve preamp gain stage when necessary. Using a Vactrol optical design for the gain reduction element and a fixed 3:1 ratio, the VoxBox offers a smooth compression, which suits tracking duties perfectly. The compressor stage features Attack and Release controls each with four settings (fast, medium fast, medium slow and slow). A Link/Separate toggle switch appears to separate the compression when used on stereo channels if required.

Manley VoxBox Signal FlowThe preamp section provides up to 60dB of gain with no compression engaged. The preamplifier works by combining the input and the 5-position gain stages. A source button lets you choose between Line level inputs and Mic level inputs. It also features a High-Pass filter with a three-way toggle switch with settings providing Flat, 80Hz and 120Hz options, and a Polarity Reversal switch marked 0deg or 180deg.

After the Preamp and EQ section is an incredibly easy De-esser/Limiter section which provides two controls only. The first control lets you select the frequency for the de-esser and offers a choice of frequencies ranging between 3kHz, 6kHz, 9kHz, and 12kHz. The last step engages the limiter. The second control is a simple threshold.

The last section is the 3-band EQ section, which is directly taken from the Manley Pultec MEQ-5 and comprises low and high boost and a mid-dip. Each band has 11 centre frequencies to choose from.

Finally, a transformer switch engages an output transformer and add focus and pleasing harmonics.

VoxBox in use

I decided to start using the plug-in on a vocal track. Inserting the plug-in on the vocal track was already a massive improvement. I then proceeded to bypass each element to hear what everything was doing. With only the preamp stage left, the vocal sounded much better already with more weight air and presence and possibly even less mud.

vxbx_review-Lead_vox-settings VoxBox Setting for Lead Vocals

As I played around the input gain and pushed the vocal track into distortion territory, it sounded extremely musical and reminded me of Butch Vig's distorted vocal sound. Needless to say, I loved it!

Playing with Mic and Line switch provided some subtle differences in tonality in addition to the gain difference.

The compressor is smooth, like many vactrol optical compressors. It reminded me a lot of the Inwards Connections TSL-4 with attack and release time controls on top. On vocals and bass, I was able to get 5 to 7dB of gain reduction before it started to suffer, which is quite high for a tracking device. At lower settings, the compression sounds natural and musical.

UAD VoxBox Review - Acoustic Guitar Setting Acoustic Guitar Setting

The de-esser is well thought out, and the choice of frequency provided works well with most sources. On vocals, I was able to control "S" sounds without sounding processed. On acoustic guitar, it did a great job at removing some of the pick noises.

The three-band EQ is a powerful tool to quickly shape the sound at source. Both Low and high boosting bands add gravitas and air in a couple of settings while the mid-dip band is great at removing mud, chest resonance or boxy rooms in just a few seconds. I also found it useful at removing some harshness in vocals.

Finally, the transformer added a final sheen to the whole sound imparting a sense of richness and larger-than-life feel.

vxbx_review-bass-settings VoxBox Bass Settings


On my UAD-2 Satellite Duo, I was able to use three instances of the plug-in. Two on mono tracks and one on a stereo track. On a mono track, the UAD Manley VoxBox took an impressive 23% of DSP resources. Users tracking through the preamps of their UAD Apollo interfaces, won't see this as a problem, but don't expect to use it in a mix unless you have a lot of DSP power.


While reviewing the plug-in, I wasn't able to use the Unison technology since I do not own a UAD Apollo audio interface so I can't comment on its effectiveness, but even without it, the plug-in in itself is nothing short of spectacular.

Although I did not have the actual hardware to compare it to, it felt very familiar to how I remembered it.

I've always been a fan of valve preamps like the Avalon VT737 or the Manley VoxBox, and this plug-in gave me the same feeling and smile. While I do not have a UAD Apollo and can't make use of the Unison technology, I know that I will be using this plug-in on most if not all my vocal tracks in the future, until I can afford the actual hardware unit.

The UAD Manley VoxBox Plug-in is included Free of Charge in the UAD-2 Ultimate 4 Package

By Paul Lavigne

One thought on “UAD Manley VoxBox Review”

  • Free UAD Unison Plug-in with Apollo Interfaces / KMR Audio News September 1, 2016 at 10:21 am

    […] Unison Plug-ins include the UAD API Vision Channel Strip, UAD Neve 1073 Preamp and EQ, UAD Neve 88RS Channel Strip, UAD Universal Audio 610 Preamp and the brand new UAD Manley Voxbox Channel Strip. […]

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