Standard Features
All-in-one bass processor with premium BOSS amps and effects
Easy stompbox-style sound creation with an intuitive knob-based interface
Superior sound quality with 24-bit AD and 32-bit DA conversion, 32-bit floating-point processing, and 48 kHz sampling rate
61 effects from the BOSS bass effects library
Ten onboard AIRD preamp models including newly developed types
Dedicated preamp section plus six simultaneous effect categories with multiple types to choose from
Edit parameters, swap out preamp and effect types, and more with BOSS Tone Studio
Eight multi-function footswitches and an expression pedal with toe switch
36 ready-to-play preset memories and 36 user memories for storing custom setups
Manual mode for pedalboard-style operation and Memory mode for switching complete setups
Blend knob for mixing in the direct bass sound
Stereo 1/4-inch outputs and mono XLR balanced output with ground lift switch
Rear-panel switch to optimize the 1/4-inch audio outputs for a bass amp or full-range sound system
Send/return loop for external pedals
Light, durable design and colorful status LEDs
Load up to three user speaker IRs
Powered via four AA batteries or optional AC adaptor
USB-C® connector for communicating with BOSS Tone Studio and audio recording/playback with music production software
Effortless Creative Control
The ME-90B delivers everything a performing bassist needs, accessed via the classic BOSS ME interface for fast stompbox-style operation. Each effect category features independent parameter knobs, allowing you to tweak tones instantly. Manual mode provides on/off footswitch control of each category, while Memory mode lets you call up 36 custom multi-effect setups. Every footswitch has a different LED color for easy identification, and it’s possible to set all LEDs to light in a fixed color for each mode if desired.
Premium BOSS Effects
The ME-90B comes stocked with premium selections from the BOSS bass effects library, organized into six logical sections that can be used simultaneously. Apply essential tone shapers like compressors, pitch effects, and filters. Explore more aggressive textures with drive and synth effects. Expand your sound with modulation, delays, and reverbs. And dive into a variety of dedicated effects for the onboard expression pedal. There’s also a Blend knob to mix in some direct bass sound for clarity, plus a send/return loop to patch in your favorite stompbox effects.
Solid Bass Tone
A strong fundamental sound is the foundation of any great bass rig. The ME-90B’s Preamp/EQ section features ten inspiring preamp types backed by advanced AIRD technology, complete with gain and EQ controls for rapid sound adjustment. Express your individual voice with BOSS originals like Natural and Drive Bass. Or call up authentic models of classic bass amplifiers from vintage to modern. There’s also an Acoustic type optimized for acoustic-electric and upright bass pickups, plus an EQ-only option for clean DI tones.
Perform, Practice, and Record
With its versatile connectivity and compact, battery-powered design, the ME-90B is ready for every playing scenario. The 1/4-inch outputs support mono or stereo operation, with quick optimization for stage amps or line-level devices via a rear-panel switch. There’s also an XLR jack with a ground lift for sending a balanced DI signal to a house PA. The ME-90B’s preamps and effects provide studio-quality sound for direct USB recording in music production software. And with the headphones jack, you can quietly hone your chops while jamming with backing tracks from a computer over USB.
Edit, Customize, and Expand
BOSS Tone Studio for Windows and macOS extends your creative range with the ability to edit tones and change out some preamp and effect types with alternate selections. You can also organize memories for different gigs and supplement the onboard speaker IRs with three from your own library. When you’re ready for fresh inspiration, log onto BOSS Tone Exchange to swap Livesets with the worldwide ME-90B community. And with the optional Bluetooth® Audio MIDI Dual Adaptor, you can stream music from a mobile device and wirelessly shape tones using the BTS editor app for iOS and Android.
Specifications
Sampling Frequency: 48 kHz
AD Conversion: 24 bits + AF method
AF Method (Adaptive Focus method): A proprietary method from Roland & BOSS that vastly improves the signal-to-noise (S/N) ratio of the AD converters.
DA Conversion: 32 bits
Processing: 32-bit floating point
Effects: 93 Types
Memories: 36 (User) + 36 (Preset)
Phrase Loop: 38 sec. (MONO)
Internal Tuning Detection Accuracy: ±0.1 cent
Input/Output Levels and Impedance
Nominal Input Level:
INPUT: -10 dBu
RETURN: -10 dBu
Maximum Input Level:
INPUT: +7 dBu
RETURN: +7 dBu
Input Impedance:
INPUT: 1 M ohm
RETURN: 1 M ohm
Nominal Output Level:
OUTPUT L/MONO, R: -10 dBu
PHONES: -10 dBu
SEND: -10 dBu
BALANCED OUTPUT: -10 dBu
Output Impedance:
OUTPUT L/MONO, R: 1 k ohm
PHONES: 44 ohms
SEND: 1 k ohm
BALANCED OUTPUT: 600 ohms
Recommended Load Impedance:
OUTPUT L/MONO, R: 10 k ohms or greater
PHONES: 44 ohms or greater
SEND: 10 k ohms or greater
BALANCED OUTPUT: 600 ohms or greater
Controls
Switches:
BANK▼/AMP/EQ, BANK▲/MOD, CTL/BLEND, MEMORY/MANUAL, 1/COMP, 2/FILTER, 3/DRV/SYN, 4/DLY/REV, PEDAL FX, GND LIFT, AMP/LINE, POWER
Buttons:
EXIT, WRITE, CTL, EDIT
Knobs:
PREAMP TYPE, BASS, MIDDLE, TREBLE, GAIN, LEVEL, MOD TYPE, TYPE, RATE/TIME, DEPTH/DUTY/FB, E.LEV/RESO, BLEND, COMP/FX1 TYPE, SUSTAIN/LOW/-1OCT, ATTACK/HIGH/-2OCT, LEVEL/DIRECT, FILTER/FX2 TYPE, SENS/RATE/KEY, TONE/DEPTH/HRM, PEAK/LEVEL/RESO, DRIVE/SYNTH TYPE, DRIVE, TONE, LEVEL, DLY/REV TYPE, TIME, FEEDBACK/TONE, E.LEVEL, OUTPUT LEVEL, PEDAL FX TYPE
Pedal: PEDAL FX
Display
7 segments, 2 characters (LED)
Tuning guides (LED)
Connectors
INPUT jack, OUTPUT (L/MONO, R) jacks, SEND jack, RETURN jack: 1/4-inch phone type
BALANCED OUTPUT jack: XLR type
PHONES jack: Stereo miniature phone type
USB COMPUTER port: USB Type-C
Bluetooth ADAPTOR connector: Dedicated connector
DC IN jack
Power Supply
Alkaline battery (AA, LR6) x 4
AC adaptor
Current Draw: 195 mA
Expected Battery Life Under Continuous Use:
Alkaline battery: Approximately 6 hours (this can vary depending on the specifications, capacity of the batteries, and the conditions of use)
Accessories
STARTUP GUIDE
Alkaline battery (AA, LR6) x 4
Leaflet "USING THE UNIT SAFELY"
Options (sold separately):
AC adaptor: PSA-S series
Bluetooth® Audio MIDI Dual Adaptor: BT-DUAL
Carry Bag: CB-ME80, CB-BU10
Size and Weight
Width: 443 mm (17-1/2 inches)
Depth: 220 mm (8-11/16 inches)
Height: 67 mm (2-11/16 inches)
Maximum Height: 93 mm (3-11/16 inches)
Weight (including battery): 2.9 kg (6 lb 7 oz)
