The B4-SUB is an actively driven cardioid subwoofer designed for rental use where controlled low-frequency coverage and reduced rear energy are required. It combines two long-excursion neodymium drivers in an integrated, cardioid arrangement to deliver tight, accurate bass while minimizing unwanted low-frequency spill behind the system. Currently only located on the east coast.

Key Features

• Cardioid dispersion, reducing rear radiation and lowering venue reverberant LF energy.
• Dual-driver design, a 15" bass-reflex driver facing the front and a 12" two-chamber bandpass driver facing the rear for directional bass control.
• Actively driven, single-channel operation for simplified setup and predictable performance.
• High output capability, with a maximum SPL of 131 dB for demanding live and installed scenarios.
• Ground-stack only configuration, optimized for use on the floor rather than flown.
• Portable for its class, weighing 44 kg (97 lb) to balance robustness and transportability.

Use Cases

• Live concerts and festivals requiring focused low end and minimal stage-to-room bleed.
• Theatrical productions and corporate events where low-frequency control is critical for intelligibility and audience comfort.
• Clubs and DJ events that need punchy, accurate bass while avoiding excessive rear reflections.
• Fill and near-field sub applications in systems that demand cardioid behavior without complex array setups.

Specifications

• Drivers: 15" (front bass-reflex) and 12" (rear two-chamber bandpass)
• Dispersion: Cardioid
• Maximum SPL: 131 dB
• Configuration: Ground-stack only
• Weight: 44 kg / 97 lb

Included with your rental

• One d&b audiotechnik B4-SUB unit with integrated cardioid electronics.
• Factory-configured settings appropriate for cardioid operation.
• Power and signal cable set, unless otherwise requested. Verify cable lengths and additional accessories with the rental coordinator.
• Delivery, setup, and operator options available upon request, subject to regional availability.

Please confirm availability and delivery options, especially as inventory is currently held on the east coast. If you require multiple units or specific rigging and power arrangements, contact the rental team to discuss quantities and logistics.

We strive to provide impeccably maintained rental equipment for the entertainment industry that is prepped and ready for your event. Our experienced staff stands ready to help you with your lighting, video, rigging & production needs. Rental inventory availability may vary based on date and 4Wall location. In cases where your preferred item is unavailable, we'll do our best to suggest a suitable replacement.