d&b audiotechnik J-Series J-INFRA Cardiod Subwoofer 3×21″
ลำโพงซับเบส d&b audiotechnik J-INFRA Cardiod Subwoofer ขนาดดอกลำโพง 21 นิ้ว 3 ดอก ทนกำลังขับ (RMS/peak 10 ms) front 1200/4800 W, Rear 600/2400 W, impedance 3 Ω (front) / 6 Ω (rear) ตอบสนองความถี่ (–5 dB standard) 27 – 60 Hz, (–5 dB INFRA mode) 27 – 70 Hz, Max SPL 144 dB
The J-INFRA is a cardioid infra subwoofer that can be used to supplement J-Series systems consisting of J8, J12 and J-SUB cabinets. It extends the frequency response of a J-Series system down to 27 Hz and can only be used in ground stacked configurations in conventional left/right set-ups, as well as arranged in an infra subwoofer array. It has two bass-reflex chambers containing three 21″ drivers, two facing forward in one chamber that are driven from one channel of the d&b amplifier and one facing backwards driven by another amplifier channel.
Through this driver set-up its cardioid dispersion pattern avoids unwanted energy behind the system and greatly reduces the reverberant field at low frequencies, providing highest accuracy in low frequency reproduction. Selecting Hypercardioid mode in the amplifier optimises the tuning of front and rear channels for a maximum rejection at the left and right sides behind the cabinet.
The J-INFRA cabinet is constructed from marine plywood and has an impact and weather protected PCP (Polyurea Cabinet Protection) finish. The front and rear of the loudspeaker cabinet are protected by a rigid metal grill and the side panels incorporate eight handles. The cabinet front is fitted with four catches for securing an optional wooden lid.
- Large format cardioid subwoofer
- Components 3 x 21″ driver
- Power handling capacity (RMS/peak 10 ms) front 1200/4800 W
- Power handling capacity (RMS/peak 10 ms) rear 600/2400 W
- Impedance 3 Ω (front) / 6 Ω (rear)
- Max SPL 144 dB
The d&b audiotechnik loudspeaker range is designed exclusively for operation with d&b amplifiers. These provide power as well as comprehensive control and protection functions tailored to achieve the performance, reliability and longevity associated with the d&b System approach. The d&b D80 amplifier is recommended to drive the J-INFRA.
The d&b 30D amplifier can also be used with the appropriate loudspeaker configuration selected. The 2-Way active mode for the J-INFRA requires two channels of the D80.