Whitestone P331 (Used)
This Whitestone P331 (Used) is a premium two-channel mastering-grade analog processor designed to add subtle
enhancement, depth, dimension, and cohesion to mixes, stems, and individual tracks.
The P331 is renowned for its extremely transparent signal path, precision stepped controls, and powerful tonal enhancement
modes that allow engineers to shape vibe without compromising clarity.
Condition & Testing
This unit is used but fully functional.
It has been cleaned, inspected, and verified to operate within proper electrical and audio specifications.
Expect normal cosmetic wear from professional studio use, but no technical defects.
- Used; excellent operational condition
- All relays, switches, transformers, and stages tested
- Minor cosmetic marks may be present
- Original Whitestone hardware — no modifications
Mastering-Grade Tone Shaping
The Whitestone P331 is designed for subtle enhancement rather than overt coloration — offering a flexible and elegant
way to add richness, cohesiveness, and depth to your audio.
Its unique analog circuit pathways allow users to select between various enhancement modes to suit different styles of
program material.
- Low Contour for adding weight and warmth
- High Contour for airy, refined top-end
- Iron Mode for transformer-based harmonic thickness
- Soft Saturation modes for subtle harmonic enhancement
- Stepped controls for accurate recall during mastering
- Bypassable coloration stages for clean or enhanced operation
Ideal For High-End Mixing & Mastering
Known for its subtle but powerful effect, the P331 is widely used for:
- Mastering chains that require tasteful analog enhancement
- Mix-bus warmth, depth, and cohesion
- Stem processing (drums, vocals, synths, guitars)
- Tracking enhancement on key instruments
- Adding glue without compression
Technical Specifications
| Type | Dual-channel analog mastering enhancer |
|---|---|
| Controls | Contour (Low/High), Saturation modes, Iron mode, Input/Output gain |
| Circuitry | Discrete analog path with transformer-based coloration options |
| Inputs/Outputs | Balanced XLR I/O |
| Gain Structure | Stepped, precise recall-friendly controls |
| Format | 2U rackmount analog hardware |
| Power | Standard IEC mains (cable included) |
| Included | Whitestone P331 unit (used), power cable |
Why Choose This Whitestone P331 (Used)?
The Whitestone P331 is considered one of the most musical and refined analog enhancement tools available today, and
used units are rarely offered due to its popularity among mastering engineers.
This used unit gives you the same world-class performance at a significantly more attractive price.