The B2-SUB is an actively driven subwoofer featuring a pair of 18" LF drivers housed in a bandpass horn cabinet. It is designed for professional audio applications, particularly as a subwoofer for d&b C- and Q-Series systems, and can also function as an infrabass system.
Function Description:
The B2-SUB operates as an actively driven subwoofer, meaning it requires an external amplifier and controller for proper operation. It utilizes two 18" low-frequency drivers within a bandpass horn design to deliver powerful and extended bass frequencies. The system can be configured for standard subwoofer operation or as an infrabass system, extending its low-frequency capabilities.
Important Technical Specifications:
- Frequency Response (-5 dB):
- With D12: 37 Hz - 100 Hz (standard) / 32 Hz - 68 Hz (INFRA)
- With A1: 37 Hz - 125 Hz (standard) / 32 Hz - 68 Hz (INFRA)
- Max. Sound Pressure (1 m, full space):
- D12 or A1: 139 dB / 136 dB (SPLmax peak, test signal pink noise with crest factor 4)
- Input Level for 100 dB SPL / 1 m: -20 dBu / -19 dBu
- Nominal Impedance: 4 ohms
- Power Handling Capacity (RMS / peak 10ms): 600 / 2400 W
- Connections:
- Standard: 1 x EP5
- Optional: 1 x NL4 or 1 x NL8, 1 x CACOM (A1)
- Pin Assignments:
- EP5: 3/4 and 5 (Pin 5: SenseDrive)
- NL4: 2+/2-
- NL8 (Z0056.600): 1+/1- (Pin 3-: SenseDrive)
- NL8 (Z0056.601): 4+/4- (Pin 3-: SenseDrive)
- CACOM (A1): Pin assignments printed on the controller module rear panel
- Weight: 102 kg (225 lb)
- Dimensions (mm [inch]): 1160 [45.67"] x 580 [22.83"] x 1046 [41.18"] (width x height x depth, including wheels)
Usage Features:
The B2-SUB offers versatile operation with d&b D12 and A1 amplifiers.
- Operation with D12:
- Select the "B2-SUB" controller setup, available in "Dual Channel" and "Mix TOP/SUB" modes.
- Standard Mode (CUT): Functions as a subwoofer for d&b C- and Q-Series systems with an upper cut-off frequency of 100 Hz.
- INFRA Mode: Restricts the frequency response to a narrow 32 Hz - 68 Hz range (-5 dB), transforming the B2 into an infrabass system for C- and Q-Series loudspeakers.
- CSA (Cardioid Subwoofer Array): A method to combine three or multiples of three B2-SUB cabinets to achieve exceptional directivity at low frequencies. In CSA mode, energy radiated to the rear of the two front-radiating cabinets is eliminated, improving the direct-to-diffuse energy ratio in audience areas. All amplifier settings (input signal, level, INFRA, EQ, delay) for a CSA must be identical.
- Operation with A1:
- One B2-SUB cabinet can be driven by a single A1 mainframe fitted with a B2-SUB controller module.
- In standard mode, the A1/B2 system is dedicated for use with d&b F2 systems.
- INFRA Setting: The INFRA setting is available, providing the same characteristics as described for D12 operation.
- Controller Module Rear Panel: Features an 8-pin CACOM output socket and a balanced XLR output (C4-OUT). The C4-OUT signal can drive C4-SUB controller inputs when the B2 is used as an infrabass system for C4-SUBs. A bypass relay ensures continued operation of C4-SUB and TOP cabinets in case of power or mainframe failure by connecting C4-OUT socket pins directly to the module's INPUT socket.
- Cabinet Construction: The B2-SUB cabinet is made from marine plywood with an impact-resistant paint finish. It features a rigid metal grill covered with acoustically transparent foam.
- Transport and Handling: The cabinet is equipped with catches at the top and bottom for securing an optional transport lid (E7911). It also incorporates eight steel handles and four heavy-duty wheels on the rear panel for ease of transport.
Maintenance Features:
- Regular Checks: Regularly inspect loudspeaker housings and accessories for visible signs of wear and tear, replacing them as necessary.
- Load Bearing Bolts: Regularly check all load-bearing bolts in mounting devices.
- Grill: The acoustically transparent foam covering the metal grill is replaceable.
Safety Precautions:
- Hearing Damage: Avoid standing in the immediate vicinity of loudspeakers driven at high levels, as sound pressure levels above approximately 95 dB SPL can cause hearing damage over prolonged exposure.
- Deployment Safety: Ensure loudspeakers and stands are placed on a firm surface. When stacking multiple systems, use straps to secure them against movement.
- Accessories: Only use d&b-tested and approved accessories for assembly and mobile deployment, adhering to correct application and maximum load capacity as detailed in specific "Mounting instructions" or "Flying system and Rigging manuals."
- Hardware: Ensure all additional hardware, fixings, and fasteners are appropriately sized and have a sufficient load safety factor, following manufacturer's instructions and safety guidelines.
- Magnetic Fields: Loudspeakers produce a static magnetic field. Maintain a distance of at least 0.5 m (1.5 ft) from magnetic data carriers (floppy disks, audio/video tapes, bank cards) and more than 1 m (3 ft) from computer and video monitors to prevent impairment or damage.
- Amplifier Configuration: Only operate B2-SUB loudspeakers with a correctly configured d&b amplifier to prevent damage to loudspeaker components.
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