Warm Audio WA-MPX Single-Channel Tube Microphone Preamp
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Warm Audio WA-MPX — Tape-Era Tube Microphone Preamp
The Warm Audio WA-MPX is a single-channel tube microphone preamp designed as an authentic recreation of the legendary 351-style preamps that defined the golden era of recording. These classic units shaped the sound of early rock ‘n’ roll and timeless hits by artists such as Elvis Presley, Bing Crosby, Les Paul, Nat King Cole, and Roy Orbison.
The WA-MPX delivers true analog warmth, harmonic richness, and musical saturation that defined the tape recording era.
Authentic Vintage Tone with Modern Flexibility
Built with a fully discrete, hand-wired circuit, the WA-MPX features three vacuum tubes per channel and custom CineMag USA transformers. With up to 90 dB of gain, it is ideal for low-output microphones including dynamic and ribbon mics.
From ultra-clean to aggressively saturated tones, the WA-MPX provides a wide tonal palette with classic tube warmth, strong midrange presence, and smooth highs.
Advanced Tone Shaping Controls
- Tone Control adjusts transformer impedance (600Ω / 150Ω) to add air or vintage thickness
- High Gain switch adds +20 dB for a total of 90 dB gain
- Tape Saturation emulates 15 IPS tape machines with harmonic distortion and compression
- 80 Hz High-Pass Filter removes unwanted low-frequency rumble
- 2 kHz Low-Pass Filter shapes tone for lo-fi mid-focused character
Applications
- Vocals — warm, forward, mix-ready tone
- Acoustic Guitar — rich and natural texture
- Electric Guitar — punchy and saturated tone
- Mixing & Mastering — analog depth and color
- Any source requiring vintage warmth and character
Technical Specifications
General
- Type: Tube Microphone Preamp
- Channels: 1
- Gain: Up to 90 dB
- Power: IEC 115/230V
- Warranty: 5 Years
- Depth: 6.25” (15.63 cm)
Controls & Features
- Tape Saturation
- High Gain (+20 dB)
- 48V Phantom Power
- Polarity Switch
- Tone Control (600Ω / 150Ω)
- High-Pass Filter: 80 Hz
- Low-Pass Filter: 2 kHz
- VU Meter
I/O
- Inputs: XLR Mic, TS Instrument, TRS Line
- Outputs: XLR, TRS Line
Components & Internal Design
- Fully discrete, hand-built design
- Tubes per channel:
- 2 × 12AX7
- 1 × 12AU7
- Custom CineMag USA transformers (large-core)
- High-voltage tube circuit (300V)
Performance
- Frequency Response: 20 Hz – 20 kHz
- Mic Input: 600Ω (6000Ω rated)
- Tone Engaged: 150Ω (1500Ω rated)
- Output Attenuator: 600Ω
Premium Build & Sound Quality
The WA-MPX uses premium-grade components and undergoes meticulous hand-testing at Warm Audio HQ in Austin, Texas. The tube design ensures rich harmonic content, while CineMag transformers add depth and analog coloration.
The Tape Saturation circuit uses a diode ladder to emulate tape compression and high-frequency roll-off, recreating the sound of classic reel-to-reel machines.
The Warm Audio WA-MPX is more than a microphone preamp — it is a complete tone-shaping tool that captures the essence of vintage recording while offering modern control and flexibility. It stands as one of the best-value all-tube microphone preamps available today.
Review of Warm Audio WA-MPX Single-Channel Tube Microphone Preamp
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