JBL 3678-HF Setup Instructions

JBL 3678-HF Setup Instructions Manual pdf 1 page image

page 1 - 3678 Owner’s Manualrev. 2.0 11/11/98 980-00023-00 CESET-UP INSTRUCTIONS FOR 3678 SCREEN CHANNEL SYSTEMHigh Frequency Horn Bracket assembly:The horn bracket that is shipped with the 3678-HF kit provides aiming flexibility in all directions. It requiresminor field assembly, and takes only several minutes to complete.The bracket assembly consists of three parts:• Driver Clamp (P/N 423-00007-67) - comes pre-installed around the rubber “tire” on the 2425HS driver.• “L”-shaped Clamp Base (P/N 423-00008-67) - inserted in cardboard packing material• Hardware pack (P/N 229-00005-00) - inserted in cardboard packing material;One (1) 1/4”-20x5/8” Philips pan head boltOne (1) 1/4”-20 nut with captive “star” washerOne (1) #8-32x1/2” Philips pan head boltOne (1) #8-32 nut with captive “star” washerOne (1) cable assembly for connecting HF driver to networkBe sure you have all of these components before you begin.STEP 1: Secure L-shaped clamp base to 3678-LF enclosure. Remove the large Philips-head bolt fromthe top of the enclosure*, and use it to fasten the L-shaped clamp baseto the cabinet so that the section with five holes is on the left-handside, as you face the enclosure (see diagram). Note that although theT-nut on the top of the enclosure may appear to be off-center, theupright section of the “L” is on the centerline, when properly positionedand secured into the T-nut.STEP 2: Secure bracket clamp/driver/horn assembly.Position clamp around the upright section of the clamp base so that it“sandwiches” the base. Secure clamp using the large 1/4”-20 Philipspan-head bolt (main clamp bolt) and nut through the center (largest)hole on the upright section of the clamp base.STEP 3: Aim horn. Using one of the four remaining positioningholes, the horn can be pitched in one of four fixed positions; +3° or+5° upward tilt, -5° downward tilt, or 0° (no tilt).The entire bracket assembly can also be free rotated 360° (“yaw”,or side-to-side aiming) around the enclosure top mounting bolt.The driver/horn can also be rotated (if necessary) simply byloosening clamp bolt, rotating the driver/horn within the clamp todesired position, then re-tightening the main clamp bolt.Note that when the horn/driver is fixed into position, it is accurately physically “time aligned” to the lowfrequency driver in the 3678-LF enclosure.* NOTE: NEVER use this T-nut as a hang point for the 3678-LF enclosure. The enclosure was not designed forsuspension, and the T-nut is not intended to support any weight.3678-LF Network Wiring Instructions:The internal network of the 3678-LF (low frequency section) can be used to operate the system in either....centerline of enclosuremain clamp bolt+5 degrees+3 degrees-5 degrees0 degrees(shown with bottom section facing the viewer)Clamp base

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