Mesa Boogie Subway+ Bass DI Preamp DI Box

The Mesa Boogie Subway+ Bass DI is a compact, studio-grade bass preamp and DI box that brings the acclaimed tone shaping of the Subway D-800+ head to your pedalboard or gig bag. With powerful, fully active EQ, flexible routing and rock-solid build quality from Petaluma, California, it is designed to handle everything from silent practice and recording sessions to full-scale live rigs.

At its heart, the Subway+ Bass DI is a versatile solid-state preamp that lets you sculpt your sound with precision, then send it exactly where you need it. Dual XLR outputs, an unbalanced line out and a buffered FX loop make it easy to integrate into any setup, while footswitchable boost and mute functions give you practical control on stage. Whether you are running direct to front of house, into an interface or driving a power amp, this box delivers consistent, musical bass tone.

The intuitive control layout makes it quick to dial in everything from tight, modern clarity to warm, vintage-inspired thump. A variable high-pass filter and voicing control work alongside a fully active four-band EQ, plus Deep and Bright switches, so you can adapt instantly to different rooms, instruments and playing styles. Powered by 9V DC or battery with automatic switching, it is equally at home on a pedalboard or thrown in a gig bag as a reliable backup preamp.

Subway D-800+ Tone in a Pedal Format

Derived directly from the Mesa Subway D-800+ amplifier, the Subway+ Bass DI captures the same responsive, musical character in a compact DI box format. You get the familiar feel and tonal flexibility of the head without needing to carry an amp, making it ideal for fly dates, quick changeovers and minimalist stage setups.

Powerful, Musical Tone Shaping

A fully active four-band EQ with sweepable low and high mids lets you fine-tune your sound with studio-style precision. The variable high-pass filter tightens the low end, while the voicing control moves from flat to a vintage-style scoop. Deep and Bright switches add instant low-end weight or top-end sparkle, so you can adapt your tone to any bass, cab or PA in seconds.

Flexible Routing for Stage and Studio

With separate mic-level and line-level XLR outputs, an unbalanced line out, a dedicated tuner output and a fully buffered series FX loop, the Subway+ Bass DI slots easily into almost any signal chain. You can send a pre or post EQ signal to front of house, feed a power amp, record a line-level track and still monitor through your own rig, all from one compact unit.

Roadworthy, Portable Design

Built in Petaluma, California, the lightweight aluminium chassis keeps weight down without sacrificing durability. Footswitchable boost and mute functions give you practical control during a gig, while 9V DC or battery power with automatic switching ensures the unit is ready to go wherever you are playing, from rehearsal rooms to festival stages.

• Subway D-800+ Derived Solid-State Preamp - The preamp circuit is based on Mesa Boogie’s acclaimed Subway D-800+ head, delivering the same articulate, punchy and musical response in a compact DI format. This gives you consistent, high-quality tone whether you are running into a power amp, an audio interface or straight to front of house.
• Comprehensive Active EQ and Filters - A fully active four-band EQ with sweepable low and high mids, plus a variable high-pass filter and voicing control, allows you to shape your sound with precision. Deep and Bright switches provide instant tonal enhancements, helping you sit perfectly in the mix in any venue or recording situation.
• Dual XLR Outputs and Flexible I/O - Separate mic-level DI and line-level preamp XLR outputs, alongside an unbalanced line out, tuner out and series FX loop, give you multiple routing options. This flexibility makes it easy to tailor your signal flow for live, studio or practice setups without needing extra boxes.
• Pedalboard-Friendly, Road-Ready Build - The compact aluminium chassis, low current draw and choice of 9V DC or battery power make the Subway+ Bass DI easy to integrate into any rig. Footswitchable boost and mute functions add practical onstage control, while Mesa’s robust construction ensures it will stand up to regular gigging.

General

• Product: Mesa Boogie Subway+ Bass DI
• Build Location: Petaluma, CA, USA
• Preamp Type: Solid-state (derived from Subway D-800+)
• Format: DI box preamp
• Chassis Material: Aluminium
• Cooling: Convection
• Colour: Black with Silver screen

Controls

• Input Gain
• Master Volume
• Variable High-Pass Filter: 30Hz to 125Hz
• Variable Voicing Control: Flat to vintage scoop
• Bass: ±14dB @ 40Hz
• Low Mid: ±14dB, sweepable 150Hz to 1800Hz
• High Mid: ±14dB, sweepable 300Hz to 5000Hz
• Treble: +11dB / -14dB @ 4kHz
• Deep Switch: Enhanced low end
• Bright Switch: Enhanced top end
• Footswitchable Boost with variable level (approx. 6dB max)
• Footswitchable Mute

Inputs and Outputs

• Instrument Input: 1 x 1/4 inch
• Tuner Output
• Balanced XLR DI Output: Mic level, Pre/Post, Ground Lift
• Balanced XLR Preamp Output: Line level
• 1/4 inch Preamp Output: Unbalanced line level
• FX Loop Send and Return: Fully buffered series loop

Power

• Power Requirements: 9V DC (centre negative) or 9V battery
• Auto-switching between external DC and battery
• Current Draw: Less than 50mA
• Approximate Battery Life: 12 hours

Dimensions and Weight

• Height: 2 inches
• Width: 8 inches
• Depth: 5.5 inches
• Weight: 2 lbs