What are the Differences Between the MANLEY VOXBOX and Avalon 737?
Processing, frequency response, i/o profile.
Major differences here are the De-Esser processing in the VOXBOX, along with the frequency response (wider in the 737), and the i/o setup, which is significantly more comprehensive in the VOXBOX.
| Specification | Manley VOXBOX | Avalon VT-737sp |
|---|---|---|
| Preamp Type | Tube | Tube |
| Number of Channels | 1 | 1 |
| Phantom Power | Yes | Yes |
| EQ | Yes | Yes |
| Compressor | Yes | Yes |
| Other Processing | De-Esser | - |
| Frequency Response | 20Hz-20kHz | 10Hz-120kHz |
| Analog Inputs | 1 x XLR (Mic), 1 x XLR (Line), 1 x 1/4" (Line) | 1 x XLR (Mic), 1 x XLR (Line in), 1 x 1/4" (Hi-Z) |
| Analog Outputs | 1 x XLR (Preamp), 1 x 1/4" (Preamp), 1 x XLR (EQ), 1 x 1/4" (EQ) | 1 x XLR (Line out) |
| Other I/O | 2 x RCA (De-Esser/Compressor Stereo Link), 1 x XLR (Insert Input), 1 x 1/4" (Insert Input) | 1 x 1/4" (Link) |
| Rack Spaces | 3U | 2U |
| Height | 5.25" | 3.5" |
| Depth | 10" | 12" |
| Width | 19" | 19" |
| Weight | 14 lbs. | 22 lbs. |
| Additional Features | Pultec-style EQ, 5 Manley transformers, Stereo Link for Compressor and De-esser/Limiter | Sweepable EQ, Opto-compressor, Class A design |
The VOXBOX could probably win out based on the i/o options alone. The VT-737 is just really weak on that front. Image via Nikola Feve
The 737sp has a wider frequency range and is a lot cheaper, but you lose in the i/o department. Image via Make Noise Pro Audio
Price Guide for VOXBOX and VT-737
Prices updated Fri, August 21st, 2026.
Main Differences (and similarities) Between the VOXBOX and VT-737
- Circuit Design: The VOXBOX and VT-737 both have an all-tube signal path.
- Preamp and EQ Capabilities: The VOXBOX has a more complex EQ section with more frequency control compared to the VT-737sp's simpler (yet still effective) EQ.
- Compressor Design: The VOXBOX's compressor borrows from Manley's other designs for a unique approach, while the VT-737sp's opto-compressor provides straightforward, effective dynamic control.
- De-Esser and Limiter: The VOXBOX has a more elaborate De-Esser and limiter section, offering more control over sibilance and dynamics.
- I/O Options: The i/o capabilities on the VOXBOX are way more comprehensive than the VT-737.
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