Chat with us, powered by LiveChat

Walrus Audio Mantle Bass Pre-Amp DI Direct Box Pedal Black

The Walrus Mantle is a preamp & DI for bass, made in collaboration with Ian Martin Allison. Featuring Hi-Z input buffer, transformer balanced output, & 24V internal power for high headroom.

OR

h m s

free-shipping-icon
In Stock!
Remove one item Add one item

Compare

Compare! Here are all the serial numbers of this model we have in stock. Compare them all and select your favorite!

    2 Day Shipping Icon

    Fast & Free Shipping

    Did you know AMS is the only music distributor with four distribution centers? And that means we can offer super-fast shipping on all your music products. Whether you don’t want the spark of inspiration to fade or you really need that replacement speaker before the next show, we have you covered anywhere in the U.S. And even better, it’s FREE!

    Free Extended Warranty

    Free 12 Month Extended Warranty

    You shouldn’t have to pay extra for a little peace of mind. When you purchase from AMS, you’ll get a free 12-month extended warranty to cover your purchase — and that’s in addition to any manufacturer’s warranties! Thousands of items in our catalog feature the “Gold Lock Extended Warranty,” so you can feel confident in your purchase.

    45 Day return

    Sometimes the gear on the computer screen seems like a better fit than when you actually get your hands on it. We understand, and that’s why AMS offers an industry-leading 45-day money-back guarantee. If you’re not happy with an item, you have a full month and a half to send it back! We don’t want to just sell you gear. We want to sell you the RIGHT gear — even if it takes a few tries.

    Canadian Shipping Information

    Welcome Canadian musicians! Buying your gear from AMS is as easy as going to a local music store, with more selection and more than competitive prices!

    Items with this logo are eligible to ship to Canada. Please note that you will be responsible for payment of brokerage fees, duties and other import taxes applicable to your order.

    NOTE: Free shipping offers do not apply to Canadian orders. Please be aware of custom fees - such as taxes and duties - when your order arrives. Since these fees vary from location to location, CUSTOMS FEES ARE NOT INCLUDED IN SHIPPING CHARGES. Please check with your local customs office for more information on the fees in your areas. Refusal to pay these fees will result in an undeliverable order. If returned, we do not refund shipping charges and may assess restocking fees to cover return shipping expenses.

    Rock Now Pay Later

    0% Interest Payment Plan

    Don’t sell your soul to a creditor to get the gear you need. At AMS, we want to lower the barriers to create. That’s why we offer in-house 0% financing, and you don’t even have to open a new line of credit! Spread out payments on your credit card to simplify financing and avoid hefty late fees or service charges. Cost shouldn’t interfere with your creativity.

    AMS Agent

    Have questions? 
    Talk to a sales specialist!

    800-319-9043

    Walrus Audio Mantle Bass Pre-Amp/DI Pedal

    Tired of a bass tone that falls flat? The Walrus Audio Mantle Bass Pre-Amp/DI Pedal might be the solution. Created with bass virtuoso Ian Martin Allison, this studio-grade preamp delivers a rock-solid foundation for your sound. It’s like having a world-class audio engineer on your pedalboard, ready to send a perfectly sculpted bass tone to the front of house that will cut through any mix.

    “I am an absolute DI fanatic, owning probably 50+ DIs and preamps. And while they’re all great in specific ways, they all either lack something critical or try to stuff in too many features, making for an underwhelming or even overwhelming user experience! This is exactly why I wanted to make Mantle. I needed this product to exist. I’m thrilled to say that now it does. And it is absolutely killer.” - Ian Martin Allison

    Walrus Audio Mantle The Heavyweight Champion of Bass DI Pedals

    The Heavyweight Champion of Bass DI Pedals

    A truly great bass tone starts with some serious hardware, and the Mantle definitely brings the brawn. Walrus Audio dedicated over a year to developing proprietary, custom-wound Sapphire transformers, designed to infuse your sound with immense weight and harmonic richness. This pedal captures the iconic punch of vintage studio consoles, giving your fingers a beautifully responsive, almost magnetic canvas to play on.

    • Sapphire Transformers: Enjoy the authoritative low-end push of a classic Neve circuit paired with the airy, articulate top-end of an API preamp, adding rich, musical coloration to your dry signal.
    • Transformer-Based Gain: Dial in up to +23dB of clean, harmonically rich gain that responds dynamically to your playing dynamics, making your instrument feel dimensional and alive.
    • High-Impedance JFET Buffer: Your bass hits a premium JFET input stage before anything else, ensuring your pickups retain their absolute maximum detail, clarity, and touch-sensitive response.

    Sculpt Your Low-End Tone with Precision

    The Mantle hands you a surgical scalpel for your low-end. Its finely tuned EQ section uses a sophisticated dual-behavior design, helping you carve out the perfect space in any mix. And with deeply satisfying rotary switches, dialing in your signature sound is not just intuitive — it's instantly repeatable, night after night.

    • 11-Position Rotary Switches: Both the Bass and Treble controls feature stepped rotary switches, giving you an authentic studio feel and making it effortless to recall your exact settings.
    • Dual-Behavior EQ: Boosting acts as a musical shelf that transitions into a broad bell curve, while cutting introduces steep, selectable -18dB/octave high-pass and low-pass filters to surgically remove mud and harshness.
    • Massive Internal Headroom: While it runs on a standard 9V supply, the Mantle internally boosts the voltage to an astonishing +24V, ensuring your loudest slaps and deepest sub-notes never clip or compress unintentionally.
    Walrus Audio Mantle Sculpt Your Low-End Tone with Precision
    Walrus Audio Mantle Pro-Level Connectivity for Any Setting

    Pro-Level Connectivity for Any Setting

    A premium preamp is useless if it can't connect to the outside world. That's why the Mantle is built to interface flawlessly with your stage rig and the mixing console simultaneously. It provides elegant solutions for high-output instruments and noisy venues, ensuring the sound engineer loves you as much as the audience does.

    • Transformer-Balanced XLR Output: Send a commanding, uncompressed, and ultra-quiet direct signal straight to the audio interface or front-of-house mixer.
    • Active/Passive Pad: Easily toggle the -10dB input pad to prevent overloading the input stage when playing active basses or instruments with exceptionally hot pickups.
    • Ground Lift Switch: Instantly eliminate frustrating hum and nasty ground-loop noise when plugging into unfamiliar, complex live setups or questionable club wiring.

    The Ultimate Anchor for Your Sound

    The Walrus Audio Mantle is what happens when passionate gear heads refuse to compromise on signal integrity. It takes the guesswork out of getting a massive, mix-ready bass tone, serving as the ultimate always-on foundational tool. Just plug in, dial up the gain, and let the heavy iron do the talking.

    Walrus Audio Mantle The Ultimate Anchor for Your Sound

    Walrus Audio Mantle Features:

    • Proprietary custom-wound Sapphire input and output transformers
    • High-impedance JFET input buffer for optimal clarity
    • Up to +23dB of musical, transformer-based gain
    • 11-position rotary switches for Bass and Treble controls
    • Dual-behavior EQ with shelving, bell, and HPF/LPF filtering
    • Transformer-balanced XLR direct output for studio and stage
    • Internally boosted to +24V for massive headroom
    • Switchable -10dB pad for active and passive bass compatibility
    • Ground lift switch to eliminate unwanted hum
    • Sleek black die-cast enclosure measuring 6.09” x 4.7” x 2.28”
    Shop Similar Models

    Walrus Audio Mantle Bass Pre-Amp DI Direct Box Pedal Black Specifications

    Walrus Audio Mantle Bass Pre-Amp DI Direct Box Pedal Black Specifications
    Product Specifications
    • Input Jack: Hi-Z 1/4" TS Unbalanced
    • Output Jack: 1/4" TS Unbalanced
    • Power Requirements: 9VDC, 500mA, Center-Negative, 2.1 mm. Power supply not included. Internally boosted to +24V for higher headroom.
    • Input Impedance: 1M Ω
    • Output Impedance: 150 Balanced, 150 Unbalanced
    • Noise floor: Balanced -101 dBV, Unbalanced -94 dBV
    • THD @ 1kHz 1Vrms: 0.04%
    • Frequency Response: 20 Hz - 20 kHz
    • Gain Range: -9 dB to +18 dB
    • EQ Boost Range: 0 dB to +15 dB
    • Dimensions, with knobs (L x W x D): 6.09” x 4.7” x 2.28” / 154.78 x 119.3 x 57.98 mm
    • Note: The use of an isolated power supply is recommended for powering all Walrus Audio pedals. Daisy chain power supplies are not recommended.
    Copyright © 1996-2025 American Musical Supply, Inc. All rights reserved