The Markbass Multiamp S Bass is a revolutionary all-in-one stereo bass amplifier designed for professional bassists who demand power, tone versatility, and complete control. Whether performing live, recording, or rehearsing, it delivers studio-grade tone shaping with massive stereo power in a compact, rack-mountable unit.

With 500W per channel @4Ω (2x300W @8Ω) in stereo mode or 1000W @8Ω in bridge mode, the MULTIAMP S provides exceptional headroom and authority for any stage or studio setup.

• All-in-one stereo bass amplification system
• 500W per channel @4Ω / 2x300W @8Ω stereo / 1000W @8Ω bridge mode
• Bi-amp option for maximum tonal separation
• Virtual Bass Amps: modern hi-fi to classic tube warmth
• Speaker Cabinets & Microphones for authentic cab simulation
• Studio Effects: compressors, limiters, delays, reverbs, modulation
• Stompbox Effects for creative tone sculpting
• Over 300 factory presets (Live, Studio, Stereo)
• Compact 2U rack-mount design, rugged steel chassis
• Silent fan cooling and Markbass yellow backlit display

• Mode: Stereo / Bridge / Bi-Amp
• Output Power: 2x500W @4Ω / 2x300W @8Ω / 1000W @8Ω Bridge
• Depth: 12.76” (324 mm)
• Weight: 9.48 lbs / 4.3 kg
• Chassis: Rugged steel, tour-ready
• Cooling: Silent fan system
• Display: Markbass yellow backlit
• Construction: 2U standard rack-mount design

• Gain, Phones Level, Master Volume
• 4-Band EQ: Low, Mid Low, Mid High, High
• Mute/Tuner with visual display
• Intuitive digital interface
• MIDI controllable (In / Thru)
• Supports external SD card memory for presets

• 1x ¼” mono instrument input
• 2x ¼” mono outputs (Left/Mono, Right)
• 2x XLR male outputs (balanced)
• Speaker outs for live performance
• Headphones output for silent practice
• MIDI Connections: In / Thru
• USB & Firmware update support (Windows/macOS)

• 105 Live Mono Factory Presets
• 105 P.A. Factory Presets
• 105 Live Stereo Factory Presets
• Total: 315 ready-to-play setups
• Advanced EQ profiles, cabinet models, and custom FX chains

• Compatible with Markbass BASS MULTIAMP MIDI Pedalboard
• Firmware update (V3.0.1) available for free download
• Regular software updates expand amp models, cabinets, and FX
• Compact, roadworthy, and built for professional use

• Combine preamp, power amp, cab sim, and effects in one unit
• Stereo and bridge flexibility for any gig
• Massive power with pristine tonal clarity
• MIDI-ready and software-upgradable
• Compact, rugged, and professional-grade design