Form Factor 1B15

A Modern Take on the Classic 15″ Bass Cabinet — Deep, Warm, and Surprisingly Punchy

The Form Factor 1B15 is the definitive modern 15″ bass cabinet—combining the rich warmth of traditional ceramic drivers with the clarity, articulation, and build precision that define the Bass Instinct Series™. Compact and powerful, the 1B15 is equally at home as a standalone cabinet or paired with the 2B10, a combination favored by countless professional bassists for its full-range authority.

Hand-built in California using CNC-milled Baltic Birch and next-generation assembly techniques, the 1B15 delivers a commanding tone with exceptional depth, musicality, and dynamic response. Whether in the studio, on stage, or in rehearsal, this cabinet brings your instrument to life with unmistakable Form Factor clarity and warmth.

Classic Ceramic Authority with Modern Refinement

At the heart of the 1B15 is a premium 15″ ceramic transducer engineered for deep, controlled lows and a thick, harmonically rich midrange. This cabinet has the warmth players expect from a 15, but with added punch, speed, and definition thanks to Form Factor’s precision enclosure design and expertly tuned crossover.

Supporting the woofer is a 1.4″ compression driver and 90×60 horn, delivering smooth, articulate highs that integrate seamlessly into the cabinet’s overall voice. A side-mounted attenuator lets you tailor the high-frequency output to match your playing style, room, or pairing configuration.

The result is a full-range cabinet capable of handling the entire musical spectrum with ease—clear, powerful, and deeply musical.

A Perfect Standalone or the Ideal Matching Companion

The 1B15 excels on its own, offering remarkable low-end authority and clarity without becoming boomy or indistinct. But it becomes something truly exceptional when paired with the Form Factor 2B10, creating one of the most sought-after full-range stacks in modern bass amplification.

Whether you play fingerstyle, pick, slap, or extended-range instruments, the 1B15 translates every nuance with accuracy and dynamic feel.

Made in California with Precision and Purpose

Built using calibrated Baltic Birch, CNC-cut panels, precision joinery, and extensive internal bracing, the 1B15 offers unmatched rigidity and resonance control. A dual-component polyurethane finish and powder-coated steel grill provide long-term durability even in demanding touring environments.

Construction highlights:

• CNC-milled Baltic Birch

• Precision cross-bracing

• Dual-component polyurethane finish

• Powder-coated 18 AWG steel grill

• Balanced side handles for transport

• Built by hand in California

This is a cabinet built to last a lifetime—and perform like new every day.

Video Demo

Specifications

Model: 1B15-8 / 1B15-4
Configuration: 1×15" Ceramic Woofer | 1×1.4" Compression Driver
Frequency Response: 32–18,000 Hz
Sensitivity: 98 dB
Power Handling: 600W RMS
Nominal Impedance: 8Ω (4Ω available by special order)
Connectors: 2 × NL4 Speakon™
Finish: Gig Armor™ Textured Black
Hardware: 18 AWG Powder-Coated Steel Grill
Handles: 2 (one per side)
Materials: Calibrated Baltic Birch
Dimensions:

• 591 × 545 × 400 mm

• 21.2 × 19.8 × 11.8 in
  Weight: 45 lbs / 20 kg
  Made In: California, USA

Please note: The 4Ω version is manufactured to order and requires approximately 1–2 weeks for production before shipping.

Warmth, Punch, Clarity — The New Standard for 15″ Bass Cabinets

The Form Factor 1B15 blends the classic tone of a ceramic 15 with modern engineering and precision craftsmanship. Whether used alone or stacked, it delivers a deeply satisfying, full-spectrum sound that inspires confident playing at any volume.

Add the 1B15 to your rig and experience a new level of musical authority.