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.
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Earn rewards every time you shop at AMS. You'll collect points on eligible purchases that turn into promotional savings on future gear, with points typically available several days after your order ships. All you need is a free AMS account — no credit card, financing, or payment plan required.
The more you shop, the more you earn. Create a free account and start earning from your very first eligible purchase. Rewards are applied as a discount on future eligible purchases.
Earn points on eligible purchases with AMS Rewards and turn them into savings on future orders, no credit card required. You can apply points at checkout once they’re available.
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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.
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
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.
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 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”