Form Factor 4B10L

The Lightest Large-Format 4×10" Cabinet in the Bass Instinct Series™ — Massive Output, Minimal Weight

The Form Factor 4B10L is the ultra-lightweight counterpart to our flagship 4B10, delivering the same commanding wall of sound with a dramatic reduction in weight. Designed for bassists who demand stadium-level power without the burden of traditional 4×10 enclosures, the 4B10L sets a new benchmark for performance-to-weight ratio.

With 1200W RMS power handling, four advanced 10" neodymium transducers, and a 1.4" high-output compression driver, this cabinet provides unmatched clarity, articulation, and low-frequency control in a format that is exceptionally easy to transport. The result is a sonic experience that must be felt to be fully appreciated—impactful, detailed, and remarkably responsive.

1200 Watts of Clean, Accurate, Effortless Power

Engineered for players who demand serious headroom, the 4B10L delivers 1200W RMS of controlled output while maintaining the precision, transparency, and tonal refinement that define the Form Factor signature.

Every note remains tight, full, and authoritative—even at extreme volumes. Whether driving modern high-powered amplifiers or classic analog heads, the 4B10L stays stable, musical, and highly articulate.

Ultra-Light Construction — No Compromise

The 4B10L is handcrafted using Italian Lite Ply, a next-generation lightweight wood engineered for exceptional rigidity and acoustic stability. Combined with a precision CNC-milled, cross-braced internal structure, this cabinet delivers the full power and low-frequency extension of its heavier ceramic sibling at just 65 lbs (30 kg).

This dramatic reduction in weight is achieved with no sacrifice in tone, projection, or durability.

Additional construction highlights include:

• Precision-jointed Italian Lite Ply panels

• Baltic Birch reinforcement in structural zones

• Dual-component polyurethane finish for years of protection

• Powder-coated steel grill for maximum driver security

Every cabinet is engineered and hand-assembled in California to exacting specifications.

Four 10″ Neo Drivers + High-Output Compression Driver

The 4B10L features four high-efficiency 10" neodymium transducers that deliver lightning-fast transient response, rich harmonic detail, and powerful low-frequency projection. These drivers operate at peak performance thanks to the cabinet’s acoustically optimized design.

A 1.4" compression driver adds smooth, controlled high-frequency extension, ideal for players who need clarity, articulation, and definition in modern performance environments. The built-in attenuator allows precise tuning of the high-end response.

The Form Factor Sound — Elevated Through Engineering

The 4B10L captures the essence of the Form Factor approach: uncolored, dynamic, and musically expressive bass reproduction.

It offers:

• Uncompressed lows with exceptional authority

• Detailed, present midrange clarity

• Smooth, extended highs with adjustable output

• Consistency across all playing styles and volumes

• A remarkably open, natural reproduction of your instrument

This is a cabinet built to elevate the player's true sound—not reshape it.

Specifications

Model: 4B10L-8
Configuration: 4×10" Neodymium Woofers | 1×1.4" Compression Driver
Frequency Response: 45–18,000 Hz
Sensitivity: 101 dB
Power Handling: 1200W RMS
Nominal Impedance: 4Ω or 8Ω
Connectors: 2 × NL4 Speakon™
Finish: Gig Armor™ Textured Black
Hardware: 18 AWG Powder-Coated Steel Grill
Handles: 2 (one per side)
Materials: Calibrated Italian Lightweight Plywood
Dimensions:

• 591 × 776 × 400 mm

• 23.3 × 30.5 × 15.7 in
  Weight: 65 lbs / 30 kg
  Made In: California, USA

Power Without Weight. Authority Without Compromise.

The Form Factor 4B10L is the ultimate lightweight large-format cabinet for professional bassists—delivering unmatched output, tonal accuracy, and touring-grade durability at a fraction of the weight of traditional 4×10 designs.

It is the cabinet for players who want maximum performance with true portability and the unmistakable Form Factor sound.

Experience the future of lightweight power.
Add the 4B10L to your rig today.