Walrus Audio Mantle Bass Pre-Amp/DI Black

Walrus Audio Mantle Bass Pre-Amp/DI Black

The Walrus Audio Mantle Bass Pre-Amp/DI is a studio-grade front-end designed to serve as a foundational tone tool for electric bass. Developed in close collaboration with Ian Martin Allison, Mantle focuses on delivering clarity, harmonic depth, and authoritative low-end through a carefully voiced, transformer-based signal path.

Built around a high-impedance JFET input stage and custom Sapphire transformers, Mantle brings together classic console-inspired character with modern headroom and flexibility. Whether used as an always-on tone shaper, a recording DI, or a live performance hub, its designed to present your bass in its most confident and fully realized form.

Highlights

• Custom Sapphire input and output transformers inspired by classic Neve and API designs
• High-impedance JFET input for articulate, touch-sensitive response
• Transformer-balanced XLR DI with massive headroom and extended low end
• Musical Bass and Treble controls with boost, cut, and filter behaviors
• Internally boosted +24V power for clean dynamics and low-noise performance

Specifications

Body

• Enclosure: Die-cast metal
• Finish: Black
• Dimensions: 6.09″ x 4.7″ x 2.28″ (154.78mm x 119.35mm x 57.98mm)

Hardware

• Input: 1/4″ TS unbalanced (Hi-Z)
• Output: 1/4″ TS unbalanced
• Direct Output: Male XLR, transformer-balanced
• Switches: Active/Passive pad, Ground lift

Electronics

• Circuit Type: Fully analog, transformer-based preamp and DI
• Input Impedance: 1M
• Output Impedance: 150 balanced / 150 unbalanced
• Gain Range: -6 dB to +23 dB
• EQ Boost Range: 0 dB to +15 dB
• Frequency Response: 20 Hz 20 kHz
• Noise Floor:

  • Balanced: -101 dBV

  • Unbalanced: -94 dBV

• THD @ 1 kHz, 1 Vrms: 0.04%

Miscellaneous

• Power Requirement: 9VDC, center-negative, 500 mA minimum
• Internal Voltage: Boosted to +24V
• Power Supply: Not included
• Recommended Power: Isolated supply only
• Routing: Simultaneous 1/4″ and XLR output supported

Why Buy from Tone Shop Guitars?

At Tone Shop Guitars, we pride ourselves on offering a curated selection of instruments backed by knowledgeable staff and exceptional customer service. Whether you’re shopping online or visiting us in person, our goal is to help you find the right guitar and deliver a top-tier experience every step of the way.

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