The M9 Carbine™ Head by Mesa/Boogie

The Mesa/Boogie M9 Carbine Head is a high-powered hybrid bass amplifier head designed for professional live and studio use. Introduced as part of Mesa/Boogie’s Carbine series, it combines a tube-driven preamp with a MOSFET solid-state power section to deliver fast response, tight low-end punch, and detailed articulation. The M9 became popular among touring bassists for its immense headroom, flexible EQ shaping, and onboard studio-quality compressor. Its 9-band graphic EQ and selectable voice controls allow players to fine-tune tones ranging from vintage warmth to aggressive modern attack. Despite its heavy-duty construction and weight, the amp is highly regarded for reliability, dynamic feel, and the signature Mesa/Boogie clarity and power.

Specs:

• Type: Hybrid bass amplifier head
• Power Output: 600 watts @ 4 or 2 ohms / 320 watts @ 8 ohms
• Preamp: 1 × Mesa 12AX7 vacuum tube
• Power Section: Trans-Class™ MOSFET power amp with 8 power MOSFETs
• EQ Section: 9-band graphic EQ with footswitchable operation
• Tone Controls: Active Bass, Passive Mid, Active Treble
• Voice Control: 5-position active Mid-Voice switch
• Compressor: Built-in studio-quality compressor with Threshold & Ratio controls
• Inputs: 1 × 1/4" instrument input
• Outputs: 2 × Speakon/1/4" combo speaker outputs
• DI Output: Balanced XLR direct output with Pre/Post, Level, and Ground Lift controls
• Effects Loop: Buffered series FX loop with automatic true bypass
• Cooling: Fan cooled
• Footswitch: Included (controls EQ and Mute)
• Formats: Standard head or 2-space rackmount version
• Construction: Aluminum chassis with Baltic Birch enclosure
• Dimensions: 8" H × 23" W × 15" D
• Weight: Approximately 50 lbs (22.7 kg)
• Manufacturer: Mesa/Boogie