Warm Audio WA-MPX Single-Channel Tube Microphone Preamplifier

Add golden-era character and grit to your recordings with the WA-MPX, a tube preamplifier that reproduces the tonality of legendary recordings from the '50s.

The WA-MPX is an authentic reproduction of the most revered microphone tube preamp that pioneered the birth of rock ‘n’ roll & radio-ready hits. During the golden-era of tape recording, this style of vintage tube preamp became the signature sound in the signal chain of hit recordings including Elvis Presley, Kurt Cobain, Les Paul, and Bing Crosby -- and is a sound that is still pursued by today’s biggest artists. With premium components, true-to-original circuit design, and tape saturation control, the WA-MPX authentically reproduces all the analog tone of the original to bring vintage warmth & color to your sound.

- Authentic Reproduction of The Most Revered Tape-Era Tube Mic Preamp:
The WA-MPX is based on the 351-style tube preamplifier found in American tape machines that pioneered the birth of rock ‘n’ roll & radio-ready hits.

- Power & Versatility for A Wider Range of Analog Tone:
Delivering an impressive 300v of raw power & 90dB of tube gain, WA-MPX achieves clean gain & powerful volume, that pushes the tubes to saturate just like the most timeless analog gear.

- Premium Components & Handwired Construction for An Authentic Vintage Experience:
Hand-assembled with three premium tubes per channel paired with custom-wound true-to-spec USA CineMag transformers, the WA-MPX authentically reproduces all the analog tone of the original.

- Selectable, All-Analog Tape Saturation:
WA-MPX uses discrete analog components that provide compression, saturation, and non-linear read more frequency response for authentic tape-era reel-to-reel sound at 15IPS.

- Hi-Pass (80Hz) & Low-Pass (2kHz) Filters to Refine Tone:
The 2kHz low-pass filter allows you to further shape and focus your tone, dialing in ultimate midrange warmth & punch. The 80Hz hi-pass filter helps remove unwanted bass noise from unruly sources.

- Hand-Inspected & Tested at Warm Audio HQ in Austin, Texas:
Carefully inspected at Warm Audio Headquarters in Austin, Texas by trained engineers & musicians with a passion for helping you sound your best.


- Authentic reproduction of the most revered tape-era tube preamp
- Fully discrete, hand-built construction with 3 tubes per channel for ultimate analog tone
- Selectable tape saturation adds harmonic distortion & natural compression
- 90dB of analog tube gain per channel
- Custom-wound, large-core CineMag USA transformers
- High gain control engages the third tube in the circuit for an added 20dB (from 70dB to 90dB) of clean gain for low-output mics and low-volume sources
- 48v phantom power & polarity switch
- Classic warm audio tone control that alters the input transformer impedance adding extra analog color
- 80Hz high-pass filter to control unruly bass frequencies
- 2kHz low-pass filter to focus preamp power & warmth on mids for added punch
- Tape saturation adds harmonic distortion & natural compression for authentic analog grit
- VU meter level indication
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- Tubes: Premium (2X) 12AX7 & (1X) 12AU7 Vacuum Tubes
- Inputs: XLR Mic, TS Instrument & TRS Line
- Outputs: XLR / TRS Line Level
- Frequency Response: 20Hz-20kHz
- Faceplate: Aluminum
- Chassis: Steel
- Knobs: Vintage Bakelite-Style
- Power: Internal IEC 115v/230v Power Inlet
- Output Attenuator: 600O
- Mic Input: 600O Transformer (6000O Rated)
- Mic Input With “Tone” Engaged: 150O Transformer (1500O Rated)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 12 lbs
Shipping Dimensions: 24 x 11 x 6 in
Manufacturer Part Number (MPN): WA-MPX

For support or warranty questions, please contact the manufacturer:
Web: https://warmaudio.com/contact-support/

Reviewers gave this product an overall rating of 5 out of 5 stars. (1 ratings)
Submitted April 8, 2023 by Justin K in Beacon, NY

"Love The Flavors You Can Get With This For Vocals"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
So far I've been using this in my vocal chain and others for Rap/Hip-Hop genere. I love the color I can get out of this box and the weight of the vocals that come through it. I don't distort it like I've seen youtube clips do. My favorite to do is hit it with tone and saturation and then input to where it starts to distort and then back off so it's clean sounding. Very impressed with the sound and will be a main stay in my chain.

Musical Style:

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