Warm Audio WA-MPX
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The Essentials to Know About the WA-MPX Tube Mic Preamp
The Essentials to Know About the WA-MPX Tube Mic Preamp
- Authentic "tape-era" color: 100% discrete hand-wired circuit, CineMag large-core transformers, and 300 V high voltage for irresistible analog warmth.
- Massive gain reserve: up to 90 dB with "High Gain" mode (+20 dB), perfect for low-output dynamic and ribbon microphones.
- Selectable tape saturation: 15 IPS emulation offering natural compression, musical harmonic distortion, and dense mids.
- Pro controls for everyday use: impedance/Tone, polarity inversion, 80 Hz and 2 kHz filters, Mic/Line/Instrument inputs, and amber needle VU meter.
Manufacturer Information
Warm Audio
https://shop.warmaudio.com
------------------------
Safety manager:
Mogar Music France
Email: info@mogarmusic.fr
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From Analog Tape to Modern Studios: The Legacy of the WA-MPX
Inspired by the legendary 351-style tube preamp that shaped early rock recordings, the WA-MPX delivers this warm, three-dimensional signature that has become a benchmark for audio engineers. Following the brand's high-end recreations, it condenses the spirit of vintage tape machines into a modern, reliable, and consistent rack format.
Who Is the WA-MPX For?
Designed for recording and mixing, it excels on vocals, guitars, DI bass, overheads, or room mics. Its immense gain reserve and impedance management make it an ally for ribbon microphones. In bus or stem processing, the tape saturation adds a musical glue ideal for mixing and even sweetening in mastering.
Key Features to Sculpt Your Tone
Massive Gain and Headroom
Three tubes per channel, 300 V on the circuit, and a discrete audio path deliver immediate analog punch. The "High Gain" switch adds 20 dB to reach 90 dB without sacrificing definition.
15 IPS Tape Saturation
A dedicated discrete circuit inserts organic compression and rich harmonics, with slight filtering that focuses energy on the mids for impactful sources.
Impedance and "Tone" Control
Impedance switching modulates the input transformer to refine body and air. Polarity control, 80 Hz and 2 kHz filters, and output attenuator facilitate integration into any studio chain.
Technical specifications
| Number of channels | 2 | Valve | Yes |
| EQ | High-pass filter | Rack unit | 2 |
| Premium vacuum tubes | 2 x 12AX7 + 1 x 12AU7 (per channel) | Low-pass filter | 2 kHz (enhances warmth and punch in the mids) |
| Internal circuit high voltage | 300 V | Selectable tape saturation (15 IPS emulation) | natural compression, harmonic distortion, and focused tonal filtering |
| Nominal gain 70 dB; "High Gain" switch | +20 dB (up to 90 dB) | Inputs | XLR mic, TRS line, TS instrument |
| Mic input | 600-ohm transformer (nominal 6000 ohms) | Outputs | XLR and TRS line level |
| Mic input with "Tone" engaged | 150-ohm transformer (nominal 1500 ohms) | Level indication | amber needle VU meter |
| High-pass filter | 80 Hz | Frequency response | 20 Hz - 20 kHz |
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Questions frequently asked
Is the WA-MPX suitable for ribbon microphones?
With up to 90 dB of gain via the High Gain switch, this preamp provides sufficient headroom for ribbon microphones. The input impedance can be adjusted using the Tone control, from a nominal 6000 ohms to a nominal 1500 ohms.
What connectivity does this preamp offer?
Inputs include a mic XLR, a line TRS, and an instrument TS. Line outputs are available on both XLR and TRS connectors.
Can the WA-MPX tape saturation be activated independently?
A discrete 15 IPS tape saturation circuit is selectable on each channel. It delivers natural compression, harmonics, and tonal filtering focused on the midrange. The 2 kHz low-pass filter can enhance this warmth and punch in the mid frequencies.
How many channels and rack units are required?
This model combines two channels into a 2-rack-unit format.
What tone controls are available?
Each channel includes an 80 Hz high-pass filter, a 2 kHz low-pass filter, and polarity reversal. The Tone control affects the input transformer impedance. An output attenuator and an amber needle VU meter facilitate level adjustment.
