Walrus Audio Mantle Analog Bass Pre-Amp/DI
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Description
At the heart of the circuit are Walrus Audio's proprietary, custom-wound Sapphire transformers, engineered to deliver the authoritative low-end and midrange push reminiscent of a classic Neve circuit, paired with an airy, articulate top end inspired by revered API preamp architecture. Together, they provide a harmonically rich canvas that elevates your playing while preserving every nuance of your instrument.
The Mantle empowers you to sculpt your signal with intention, offering musical gain, smartly tuned EQ, tremendous headroom, and transformer-balanced outputs. Every component and stage of the signal path is built to ensure whatever comes next - amp, interface, or mixer - receives your bass in its most confident, fully realized form.
Transformers
The Mantle features Walrus Audio's proprietary custom-wound "Sapphire" transformers. With more than a year of research, listening, and refinement, the Walrus engineering team has set a new benchmark for their designs with new input and output transformers reflecting Walrus Audio's commitment to providing creators with cutting-edge tools that inspire innovation and creativity.
Based on Neve designs, the input transformer is capable of handling large signals without added distortion while maintaining a clean, strong, and quiet signal. High-quality core material and copper windings were used to achieve the gain needed for pristine performance across the frequency spectrum.
The output transformer is based on the output stage of an API 312. This serves two functions: It balances the signal quietly and effectively while also providing rich harmonic content to the amplified signal. Like the input transformer, the style of core and customized winding method result in a strong signal that can be transmitted over long cable runs without signal loss.
Features
• High-impedance JFET Input Buffer for articulate, touch-sensitive response and exceptional clarity• Up to +18dB of transformer-based gain offering clean, magnetic, harmonically rich amplification with premium depth and detail
• Custom-tailored Bass & Treble controls co-designed with Ian, utilizing a sophisticated blend of shelving, bandpass, and selectable LPF/HPF behaviors
• Transformer-balanced XLR output ensures expansive headroom, uncompressed dynamics, and commanding low-frequency extension
• High-headroom +24V internal power supply for clean dynamics and effortless low-end
• Active/Passive Pad & Ground Lift switches for enhanced compatibility to allow for more headroom if needed when using an active bass
• Flexible routing with 1/4" in/out and balanced XLR direct output for modern routing needs
Specifications
- Power Requirements: 9VDC, 500mA, Center-Negative, 2.1mm. Power supply not included- Internally boosted to +24V for higher headroom
- The use of an isolated power supply is recommended for powering all Walrus Audio pedals. Daisy chain power supplies are not recommended
- Input Impedance: 1M Ω
- Output Impedance: 150 Balanced, 150 Unbalanced
- Noise floor: Balanced -101dBV, Unbalanced -94dBV
- THD @ 1kHz 1Vrms: 0.04%
- Frequency Response: 20Hz - 20kHz
- Gain Range: -9dB -> +18dB
- EQ Boost Range: 0dB -> +15dB
- Exact Size of the die-cast enclosure (with knobs) is 6.09 x 4.7 x 2.28" (154.78 x 119.35 x 57.98 mm)
Q & A
Reviews
Protect your investment with the Long & McQuade Performance Warranty
A warranty can be a very important factor when making a buying decision. Because repairs can be very expensive in terms of parts and labour costs, manufacturers usually only provide one year limited warranties that generally only cover items that malfunction due to a manufacturer’s defect. With an important purchase such as a musical
instrument or piece of studio gear, however, many people want to have the peace of mind in knowing that their investment will be protected should the product no longer be performing at 100%.
Because of this, Long & McQuade provides our customers with a FREE one-year Performance Warranty on most of our products. The Long & McQuade Performance Warranty supplements the manufacturer’s warranty to ensure that our customers receive complete “no hassle” warranty coverage within their first year.
How does the Long & McQuade Performance Warranty differ from most manufacturers' warranties?
- Performance Guarantee: Normal wear and tear is covered, so your product will be performing as well as the day you purchased it for the entire duration of the coverage. Band and Orchestral Performance Warranty does not include replacing pads or cleaning for woodwind instruments, unless deemed necessary by our repair staff. Ultrasonic cleaning for brass instruments will be provided if deemed necessary by our repair staff, but is not routinely offered under the Performance Warranty.
- Product Replacement: If your product cannot be fixed or costs too much to fix, we will replace it with the equivalent model for no additional charge. If this is not possible, a full refund will be provided.
- No Lemon Policy: Your product will be replaced should the same problem occur multiple times.
- Convenient: Easy drop off and pick up of the product at any Long & McQuade location.
- Guitar Setup: Guitars purchased at Long & McQuade come with 1 free setup, to be redeemed within 1 year for new guitars and 90 days for used guitars.
- Loaners Available: A loaner product may be given while the product is being repaired.
- Power Surge Protection: Your product is covered even if damaged from a power surge.
- Accessory Coverage: Any peripheral devices or accessories that come with your product (i.e. foot pedal, case) are also covered.
- Commercial Use Coverage: Music and recording professionals who purchase gear for “heavy-use” commercial purposes will still be covered.
Long & McQuade reserves the right to restrict the purchase of additional years of Performance Warranty. Used products come with a 3-month Long & McQuade Performance Warranty. Some products (i.e. computers, software, cymbals and other items) are covered only by the manufacturer‘s warranty. Consumables (i.e. strings, reeds, drum sticks, batteries, tubes, cross faders) are excluded as they are designed to be replaced. Cosmetic Damage, Accidental Damage, or problems caused by Humidity or Temperature Issues are not covered. Speakers damaged by overpowering are generally not covered. Our coverage does not provide compensation for loss of use. As of June 2018 the Performance Warranty is no longer transferable. The warranty is only valid in Canada.
Purchasing additional years of coverage
Some manufacturers provide warranties for longer than 1 year; however, these are usually limited warranties that do not provide the same coverage as the Long & McQuade Performance Warranty. Customers interested in more complete and convenient (but not necessarily longer) coverage are still able to purchase additional years of the Performance Warranty.
If you are interested in receiving this coverage for longer than one year, you have the option of purchasing additional years of the Performance Warranty. The pricing is as follows:
- NEW products: Starting at 4% of the current new selling price to double the warranty from 1 year to 2 years. Starting at 4% for each additional year.
- USED products: Starting at 4% of the current new selling price to increase the warranty from 3 months to 1 year. Starting at 4% for each additional year.
- GUITARS: 4% of the current new selling price to double the warranty from 1 year to 2 years. 4% for each additional year. $45 maximum. An additional free setup is not included with additional purchased years of Performance Warranty.
- BAND and ORCHESTRAL instruments: 4% of the current new selling price to double the warranty from 1 year to 2 years. 4% for each additional year.
Reserve in Store
| Product | SKU | Qty |
|---|---|---|
| Mantle Analog Bass Pre-Amp/DI | 835463 |
