2.3.1 Controller settings
For acoustic adjustment the INFRA and CSA function can be
selected.
INFRA circuit
Selecting the INFRA circuit restricts the frequency response to a
narrow 32 Hz – 68 Hz range (–5 dB). This transforms the
B22-SUB into an infrabass system.
CSA mode
The CSA (Cardioid Subwoofer Array) mode enables the
combination of three or multiples of three subwoofer cabinets into
an array which produces exceptional low frequency directivity
control.
The amplifier channel for the center subwoofer of the array, which
is physically pointed to the rear, has CSA selected. The forward
facing cabinets are driven with an amplifier channel set to
standard mode. The resulting cardioid behavior of the array will
significantly reduce the energy radiated to the rear.
For further information, please refer to the d&b TI 330 Cardioid
Subwoofer Array, which is available for download at
www.dbaudio.com.
2.4 Technical specifications
System data
Frequency response (–5 dB standard)
37 Hz - 90 Hz
Frequency response (–5 dB INFRA mode) 32 Hz - 68 Hz
Max. sound pressure (1 m, free field)
with D12/D20/30D 140 dB
with D80 143 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
Loudspeaker data
Nominal impedance
4 ohms
Power handling capacity (RMS/peak 10 ms) 1000/4000 W
Components 2 x 18" driver with neodymium magnet
Connections 2 x NLT4 F/M
optional 2 x EP5
WR option: Faston type connector (2 x 6.3 mm), female
Pin assignment NLT4 F/M: 2+/2–
EP5: 3:+ / 4:–
WR option: Brown: (+) / Blue: (–)
Weight 106 kg (234 lb)
CSA Stack (example)
B22-SUB frequency response, standard and INFRA modes
d&b B22-SUB Manual 1.2 en 7
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