Introducing the B2 FOUR Amp and Effects Emulator, powered with Zoom’s Multi-Layer IR technology and 6 iconic DI models. Now you can craft the perfect low-end tone.

Build patches from 104 effects, including models of famous boutique effects and preamps. Mix and match up to 5 effects and amps simultaneously to build your own custom patches.

When you need to plug directly into the house PA, the lightweight and portable B2 FOUR has you covered. It features six DI models that recreate the tone of world-class direct boxes:

• Tube 1 for rich harmonics and thick low frequencies.
• Tube 2 for a clear attack and tight low frequencies.
• Tube 3 for a clear and glossy sound.
• Solid State 1 for moderate compression and sharp tones.
• Solid State 2 for a clear tone and little distortion.
• Solid State 3 for elevated mids and low treble to replicate the Motown sound

Zoom’s innovative Multi-Layer IR technology recreates the tonal characteristics of playing through classic amps and cabinets. These impulse responses were captured from cabinets at 3 different levels and are activated based on the volume of your bass.

Preloaded with 250 presets, these patches are designed to give bassists the ability to recreate the sound of popular songs from the 50’s to today.

The 4 rotary encoders allow for quick adjustments to effects parameters as well as output settings. The cross key navigation buttons help you control the pedal with ease.

Jam and rehearse with the B2 FOUR. The 60-second looper allows you to build grooves, while the 68 rhythm patterns from the on-board drum machine are the perfect companion for practice.

A balanced output helps you connect directly to a PA or interface while the stereo outputs can connect to an amp. The instrument input has a switch to change the impedance from 1M to 10M ohms, giving you a cleaner tone for upright basses equipped with piezo pickups.

The B2 Four can be used as a 2-in/ 2-out audio interface by connecting to a computer or smartphone with your favorite effects and amp models.

With a constantly expanding library of patches and effects, bassists can continue to expand their sound with the "Handy Guitar Lab for B2 FOUR" app (for iOS), available to purchase on the Apple App Store.

Clear Drive
This original ZOOM Clear DRV preamp uses a linear phase filter in the distortion path. As a result, phase interference is eliminated during dry mixing, providing a clear drive.

Super Low Preamp
A ZOOM original preamp for super low sound. Using “missing fundamental” acoustic science, SpLoPre is equipped with a bass enhancer which emphasizes the low end of every note. With a Lo EQ and a negative one octave sound, a super low-end tone is produced.

Djent Preamp
An original ZOOM preamp recommended for Djent sounds. This preamp combines an undistorted low-end with a strongly distorted high-end to provide a crisp, intense distortion even with a down-tuned 5-string bass.

1073 Preamp
A thick, warm sound of a vintage mic preamp with transformer distortion.

Solid Preamp
Modeled after a console’s solid state mic preamp, the SolidPre delivers tight sounding harmonics with the ultra-low frequencies cut out.

Bass Analog Octave
ZOOM's original octaver uses an algorithm based on the operating principle of analog octavers.

Bass Standard Synth
ZOOM’s original bass synthesizer sound with adjustable filtering detail.

Bass Synth Talk
This effect produces a synthesizer sound similar to a talking modulator.