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ZOOM

B1 Four

Guitar/Bass Effects

Over 60 effects, 9 amp models, 5 simultaneous effects, 30s looper, 68 rhythm patterns, 50 patch slots, tuner, USB, AUX in, compact, runs on AA or USB power

$129.99 CAD
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Description

The Zoom B1 Four is a powerful and portable bass multi-effects processor designed to help bassists shape, explore, and refine their sound with ease. Compact enough to fit in a gig bag yet packed with over 60 built-in effects, including classic amp models from brands like Fender, Ampeg, and Aguilar*, the B1 Four empowers you to craft tones for virtually any genre. You can chain up to five effects at once, arrange them in any order, and store up to 50 custom patches, making it ideal for both practice and live performance.

Beyond tone shaping, the B1 Four is also a creative tool. It features a built-in looper that records up to 30 seconds / 64 beats of audio, and a rhythm section with 68 drum patterns to jam or practice with. The onboard chromatic tuner, auto save function, and preselect feature (which allows you to silently switch patches) add to its stage and studio readiness. Plus, with Zoom Guitar Lab software, you can download new effects and manage your patches easily via the USB port, which also supports power and firmware updates.

Practical and performance-ready, the B1 Four includes 1/4” input and output jacks, auxiliary input, and a stereo headphone output for silent practice. It runs on four AA batteries (up to 18 hours), a Zoom AD-16 AC adapter (sold separately), or USB bus power. Whether you're just starting out or need a compact all-in-one solution for gigs and practice, the Zoom B1 Four delivers a big sound in a small, budget-friendly package.

Features

Compact Multi-Effects for Bass
Packed with 60+ built-in effects and amp models, designed specifically for bass players.

Customizable Sound Chains
Use up to 5 effects simultaneously in any order to craft your ideal tone.

Built-In Looper and Drum Machine
Record loops up to 30 seconds and jam with 68 rhythm patterns in various time signatures.

Access to ZOOM Guitar Lab
Download new effects, patches, and manage your library via USB with free software.

Auto Save and Silent Patch Switching
Instantly saves settings and allows seamless patch changes during live performance.

Professional Connectivity Options
Includes bass input, aux in, and combined line/headphone output for practice or performance.

Battery, Adapter, or USB Powered
Runs on AA batteries, optional power adapter, or USB for total flexibility.

Lightweight and Pedalboard Friendly
Small enough to fit in your gig bag and easy to integrate into any setup.

Specifications

General Specifications
Device Type: Bass Multi-Effects Processor
Model: Zoom B1 FOUR
Max Simultaneous Effects: 5
Built-in Effects: 60+
Amp Models: 9
User Patch Memory: 50
Built-in Rhythm Patterns: 68
Looper: 30 seconds / 64 beats (44.1 kHz, 16-bit, mono)
Display: 128 × 32 Dot Matrix LCD
Tuner: Chromatic

Signal Processing
Sampling Frequency: 44.1 kHz
A/D Conversion: 24-bit, 128× Oversampling
D/A Conversion: 24-bit, 128× Oversampling
Processing: 32-bit
Input S/N Ratio: 120 dB
Noise Floor: –97 dBu

Inputs
Instrument Input: Standard Mono Phone Jack
Rated Input Level: –20 dBu
Input Impedance: 470 kΩ
Aux Input: Stereo Mini Jack
Rated Input Level: –10 dBu
Input Impedance: 1 kΩ

Outputs
Output: Stereo Phone Jack (Line/Headphone Combined)
Max Output Level (Line): +2 dBu (Load ≥ 10 kΩ)
Max Output Level (Headphones): 17 mW + 17 mW (32 Ω Load)

Power
Power Supply: 4 × AA Batteries / USB Bus Power / Optional Zoom AD-16 AC Adapter (9V DC, 500 mA, Center Negative)
Battery Life: Approx. 18 Hours (Alkaline, LCD Backlight Off)
USB: USB 2.0 Micro-B (Power, Firmware Updates, Guitar Lab Connection)

Dimensions & Weight
External Dimensions: 156 mm (D) × 130 mm (W) × 42 mm (H)
Weight: 340 g (Excluding Batteries)

Features
Zoom Guitar Lab Compatibility: Yes
Auto Save Function: Yes
Preselect Function: Yes
Expression Pedal: Not Included (Available on B1X FOUR)
Pedalboard Integration: Compatible
Portable Design: Yes
Bypass/Effect Switching: Manual
Construction: Plastic Housing

Included Accessories
Included: B1 FOUR Processor, Quick Guide, Bass Patch List

Software Compatibility
Guitar Lab Software: Patch Creation, Editing, Backup
USB Compatibility: USB 1.1 Full Speed (Data Transfer Cable Required)

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