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Amplifiers. Applications. Data. Downloads. Documentation. 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 two-way actively driven using both channels of d&b's 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 (1 m, 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 Top of the page. Downloads Array calculators CAD drawings 2D/3D Documentation PDF Title Language Date Size Declaration of Conformity Loudspeaker/Amplifiers (CE) Int 14.10.09 25 kB J-INFRA Manual 1.0 English 19.12.08 160 kB TI 385 J, Q and T-Series system design, d&b ArrayCalc V6 English 12.07.10 3395 kB The J-Series brochure English 22.03.10 3929 kB Order form for printed documentation from d&b. Top. Feedback.