Boss EX-4 Effects Expander Compact Pedalboard Multi-Effects Pedal

Endless Array of Sounds - The Boss EX-4 Effects Expander Compact Pedalboard Multi-Effects Pedal

The EX-4 is a premium BOSS effects unit that instantly expands the sonic capabilities of any pedalboard setup. This compact powerhouse delivers up to four simultaneous effects from a vast onboard library, accessed with an intuitive user interface, flexible footswitches, and a versatile range of connectivity options. The EX-4 is ideal for guitarists, bassists, and other musicians who carefully curate effect choices to maximize creative and tonal options in their pedalboard builds. Offering a large selection of classic BOSS effects in a space-saving package, this is the ultimate utility pedal for players needing to cover many songs/styles or craft professional sounds on the fly.

Expanded Range, Small Footprint

• With 120 high-quality BOSS effects on tap, the EX-4 brings a nearly endless array of on-demand sounds to any pedalboard
• Compact size saves valuable pedalboard space
• Every major effect category is available—including overdrives/distortions, mod effects, delays, and reverbs—plus bass-tuned effects and unique BOSS favorites like Slow Gear, Slicer, and more
• Dedicated utility blocks that can be placed anywhere within an effect chain—including foot volume, two noise suppressors, send/return, and divider/mixer—plus a global EQ for overall sound shaping
• Control effects using dual multi-function footswitches with color LEDs
• Versatile mono/stereo I/O, flexible effect loop, and space-saving TRS MIDI jacks

Dial in Great Sounds Fast

• Gear Suite function makes sound creation quick and simple, allowing players to call up ready-to-play effects and save favorite parameter setups for each effect type
• Fluid operation with an informative color display, intuitive knobs, and dedicated FX buttons
• Manual and Memory modes for stompbox-style or preset-based effect control
• 128 preset memories for guitar and bass, plus 128 user memories for saving custom sounds

No Creative Barriers

• Run up to four effects at once, including multiple instances of the same effect
• Set up standard serial effects chains and reorder effects as needed
• Create complex effect configurations with advanced series, parallel, and wet/dry options
• Use the effect loop to build reorderable chains with external pedals
• Seamless memory changes with full carryover of delay and reverb effects possible with certain effect configurations
• Use the footswitches for basic effect and preset control or access deeper assignment features for sophisticated custom operation

Vivid Color Display

Full color 2.4-inch screen for clear viewing of the full effect signal chain, individual effect blocks, editing options, menus, and more.

Dedicated FX Button

Quickly turn effect blocks on/off with a single press and access editing parameters with a long press. FX button colors match each effect's display colors for fast identification.

Dual Footswitch with Split Leads

Rugged dual-function footswitches can be custom-configured system-wide or per memory, with assignments that include effect block on/off, memory up/down, master bypass, tap tempo, and more. A newly designed color LED system surrounds the footswitches, allowing players to clearly identify current footswitch functions while performing.

Comprehensive I/O

Four audio jacks provide mono or stereo connectivity, with the option to use two jacks as an effect loop for placing one or more external pedals anywhere within the EX-4's effect chain. Two footswitches or an expression pedal can be connected for more real-time control, while MIDI I/O unlocks deep integration with other MIDI pedals, switching systems, and external clocking devices.

SPECIFICATIONS

• Sampling Frequency: 48 kHz
• AD Conversion: 24 bits + AF method *AF method (Adaptive Focus method) This is a proprietary method from Roland & BOSS that vastly improves the signal-to-noise (SN) ratio of the AD and DA converters
• DA Conversion: 32 bits
• Processing: 32-bit floating point
• Effects: 120 types
• Maximum Number of Effects: 4(FX1-4) + 6(DIVIDER+MIXER, SEND RETURN, FOOT VOLUME, NOISE SUPPRESSOR1, NOISE SUPPRESSOR2, GLOBAL EQ)
• Memories: 128 (User) + 128 (Preset)
• Nominal Input Level: INPUT L/MONO jack, INPUT R(RETURN) jack: -10 dBu
• Maximum Input Level: INPUT L/MONO jack, INPUT R(RETURN) jack: +7 dBu
• Input Impedance: INPUT L/MONO jack, INPUT R(RETURN) jack: 1 M ohm
• Nominal Output Level: OUTPUT L/MONO jack, OUTPUT R(SEND) jack: -10 dBu
• Output Impedance: OUTPUT L/MONO jack, OUTPUT R(SEND) jack: 1 k ohm
• Recommended Load Impedance: OUTPUT L/MONO jack, OUTPUT R(SEND) jack: 10 k ohms or greater
• Controls: DOWN/1 switch, UP/2 switch, MENU/EXIT button, GEAR SUITE button, FX1 button, FX2 button, FX3 button, FX4 button, SELECT knob, TYPE/VALUE knob, 1-3 knobs
• Display: Color Graphic LCD (320 x 240 dots)
• Connectors: INPUT L/MONO jack, INPUT R(RETURN) jack, OUTPUT L/MONO jack, OUTPUT R(SEND) jack, : 1/4-inch phone type; MIDI IN jack, MIDI OUT jack : Miniature phone type; CTL1([3]),2([4])/EXP; jack: 1/4-inch TRS phone type; USB port: USB Type-C(R); DC IN jack
• Power Supply: AC adaptor (PSA-S series)
• Current Draw: 300 mA
• Size: 4-5/8 x 5-7/16 x 2-9/16 inches (117 x 138 x 63 mm)
• Weight: 1 lbs
• Included: STARTUP GUIDE, Leaflet "Read Me First," AC adaptor: PSA-S series, Rubber foot x 4

Manufacturer: Boss
Model: EX-4
SKU: I944570-N-20-WHXA
UPC: 761294523490

We are Chuck Levin's Washington Music Center

Since 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.

Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.

Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.