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
• Download and share ME-90B Livesets on BOSS Tone Exchange
• Optional Bluetooth® Audio MIDI Dual Adaptor allows you to edit sounds and stream audio from an iOS or Android mobile device

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 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
• Controls: Bank Down/Amp/EQ Switch, Bank Up/Mod Switch, Ctl/Blend Switch, Memory/Manual Switch, 1/Comp Switch, 2/Filter Switch, 3/Drv/Syn Switch, 4/Dly/Rev Switch, Pedal FX Switch, Gnd Lift Switch, Amp/Line Switch, Power Switch, Exit Button, Write Button, Ctl Button, Edit Button, Preamp Type Knob, Bass Knob, Middle Knob, Treble Knob, Gain Knob, Level Knob, Mod Type Knob, Type Knob, Rate/Time Knob, Depth/Duty/FB Knob, e.lev/Reso Knob, Blend Knob, Comp/FX1 Type Knob, Sustain/Low/-1OCT Knob, Attack/High/-2OCT Knob, Level/Direct Knob, Filter/FX2 Type Knob, Sens/Rate/Key Knob, Tone/Depth/Hrm Knob, Peak/Level/Reso Knob, Drive/Synth Type Knob, Drive Knob, Tone Knob, Level Knob, Dly/Rev Type Knob, Time Knob, Feedback/Tone Knob, e.level Knob, Output Level Knob, Pedal FX Type Knob, Pedal FX Pedal
• 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(R), Bluetooth ADAPTOR connector: Dedicated connector, DC IN jack
• Power Supply: Alkaline battery (AA, LR6) x 4 or AC adaptor
• Current Draw: 195 mA
• Included Accessories: Startup Guide, Alkaline battery (AA, LR6) x 4, Leaflet "Using the Unit Safely"
• Dimensions: 443 mm (W) x 220 mm (D) x 93 mm (H)
• Weight: 2.9 kg / 6 lb 7oz