J-INFRA
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 setups 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 a channel of the D12 amplifier and one facing backwards driven by the other D12 channel. Through this driver setup 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 D12 optimizes 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 transport lid.
Amplifiers
The J-INFRA is 2-way actively driven using both channels of the d&b D12 amplifier configured for the J-INFRA. More detailed information on specific loudspeaker setups with the D12 amplifier is available either in the relevant loudspeaker or D12 manual.
Applications
| Live music | |
| Playback | |
| Speech | |
| Stage monitor | |
| Subwoofer |  |
Data
| Components | 3 x 21" driver |
Max. sound pressure (1m, free field) with D12 |
141 dB SPL |
| Power handling capacity (RMS / peak 10 ms) front | 1200 / 4800 W |
| Power handling capacity (RMS / peak 10 ms) rear | 600 / 2400 W |
| Frequency response (-5 dB) | 27 Hz - 60 / 70 Hz |
| Cabinets per D12 | 1 |
| Dimensions mm (H x W x D) | 685 x 1180 x 1040 / 1158 |
| Weight kg | 152 |
| Dimensions inch (H x W x D) | 27.0 x 46.5 x 41.0 / 45.6 |
| Weight lb | 335 |
Application information is presented for guidance only. We reserve the right to make any necessary changes to the products and the published specification. As part of our ongoing product development program we try, where possible, to maintain the highest degree of product compatibility.
|
recommended use |
|
SPL max peak test signal: pink noise with crest factor 4 |
|
70 Hz mode |
|
dimensions without wheels |
Downloads
Documentation
| Title | Language | Date | Size |
|---|---|---|---|
| Declaration of Conformity Loudspeaker/Amplifiers (CE) | Int | 05.10.11 | 34 kB |
| J-INFRA Manual 1.0 | English | 19.12.08 | 161 kB |
| The J-Series brochure | English | 15.06.11 | 6633 kB |
| TI 385 d&b Line array design, d&b ArrayCalc V6.4 | English | 08.03.11 | 3287 kB |
Order form for printed documentation from d&b.
FAQs
Please find the specified FAQs here.
