Zoom
B1 Four Bass Multi-Effects Processor
Best all-in-one processor for bassists seeking versatile tone and practice tools.
Unleash your bass tone with the Zoom B2 FOUR, a versatile Amp and Effects Emulator designed for bassists. Featuring Zoom’s advanced Multi-Layer IR technology and six iconic DI models, it offers unparalleled tone shaping. Craft unique sounds with 104 effects, chaining up to five simultaneously, and explore 250 presets inspired by popular songs. Enhance your practice and performance with a 60-second looper, 68 rhythm beats, and seamless USB audio interface functionality for recording.
$131.99
Owner Satisfaction
4.5
/ 5
Category Rank
126
/ 204
#126 in Effects Processors
Price vs Category Average
-71%
Below average
Number of Effects
104
Who it's for
- Bassists seeking diverse sonic textures on a budget
- Solo musicians needing integrated practice and songwriting tools
- Gigging players requiring a lightweight, battery-powered mobile rig
Who should skip it
- Players who prioritize quick, intuitive patch editing
- Touring professionals demanding rugged, metal-cased equipment
- Performers needing balanced XLR outputs for direct PA connection
Performance breakdown
Tone Versatility
Multi-Layer IR technology delivers an expansive range of professional-grade bass textures.
Signal Chain Flexibility
Stacking five simultaneous effects offers deep creative control for complex soundscapes.
Practice Utility
Integrated rhythm patterns and a looper make solo practice sessions highly productive.
Interface Integration
Seamless USB connectivity simplifies direct recording for home studio setups.
Pickup Compatibility
Switchable impedance ensures optimal performance for both active and piezo pickups.
Control Ergonomics
Four rotary encoders provide intuitive navigation but lack dedicated physical footswitches.
Key Specs
Number of Effects
104
Number of Presets
250
Looper Capacity
60 seconds
Rhythm Beats
68
Input Impedance
1M to 10M ohms (switchable)
Connectivity
USB (2-in/ 2-out audio interface), 1/4 inch Jack
Model Number
ZB2Four
Signal Path Type
Digital
Features
- Realistic amp modeling with Multi-Layer IR
- Six distinct DI models for direct tones
- Chain up to five effects and amps
- Integrated 60-second looper and rhythm machine
- Functions as a USB audio interface
- Switchable input impedance for piezo pickups
- Intuitive control with 4 rotary encoders
- 250 diverse presets for song-inspired tones
What customers say
Customers overwhelmingly praise the Zoom B1 Four for its exceptional value and comprehensive features. Users are highly satisfied with the broad range and quality of effects, amp models, and cabinet simulations available at this accessible price. It is considered an ideal, versatile tool for practice, learning, and small performances. The ability to chain five effects simultaneously, plus the integrated looper and drum machine, greatly enhances its utility for creative exploration. While the build is plastic, it is deemed robust enough for its purpose, and the compact design is appreciated. Minor issues like the small display are overshadowed by the unit's powerful sonic performance, making it a highly recommended, affordable multi-effects choice.
Know before you buy
Yes, the pedal features a built-in 2-in/2-out USB audio interface, allowing you to record your bass directly into your computer's DAW without needing additional hardware.
Absolutely. The B2 FOUR includes a switchable input impedance setting that can be adjusted up to 10M ohms, ensuring optimal signal clarity and frequency response for piezo-equipped instruments.
You can chain up to five effects and amp models simultaneously, giving you plenty of flexibility to build complex signal paths and custom tones.
Yes, the pedal includes 68 built-in rhythm patterns and a 60-second looper, which are excellent tools for practicing timing, working on scales, or building backing tracks for solo improvisation.
Yes, it includes a dedicated software editor that makes it much easier to manage your 250 presets and tweak your effect chains directly from your computer screen.
No, the B2 FOUR is designed as a compact stompbox-style unit without integrated footswitches. It is primarily intended for desktop use, studio recording, or as a tone-shaping tool where you select presets via the rotary encoders.
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