d&b audiotechnik J-INFRA, Руководство пользователя

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2.1. Product description
The J-INFRA is the cardioid infra subwoofer for the J-Series. It can
be used to supplement J-Series systems consisting of J8, J12 and
J-SUB cabinets in various combinations. It extends the frequency
response of a J-Series system down to 27 Hz
J-INFRA cabinets can be used ground stacked in a conventional
L/R setup as well as arranged in a subwoofer array. One J-INFRA
cabinet provides additional very low frequency energy for two
J-SUBs.
The J-INFRA cabinet is an actively driven 2-way bass-reflex design
housing three long excursion neodymium 21“ drivers, two drivers
face to the front while one driver radiates to the rear of the cabinet.
Front and rear drivers are driven by separate amplifier channels
and operate in independent bass reflex chambers. Through its
cardioid dispersion pattern this setup avoids unwanted energy
behind the system and greatly reduces the reverberant field at low
frequencies providing highest accuracy in low frequency
reproduction. J-INFRA cabinets have to be arrayed with a minimum
distance of 60 cm (2 ft) between adjacent cabinets.
The 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. Each side panel incorporates four handles and
mounted on the rear panel are four heavy duty wheels. Two
runners extend from the rear to the front panel of the cabinet
protecting the bottom panel against scratching.
Two correspondingly shaped recesses are incorporated in the top
panel of each cabinet to accept these runners and prevent cabinet
movement when stacking J-INFRAs. The cabinet front is fitted with
four catches for securing the optional transport lid E7920.
2. J-INFRA loudspeaker
d&b J-INFRA Manual 2.2 en 5