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page 1 - 3678 Owner’s Manual

rev. 2.0  11/11/98                              980-00023-00

CE

SET-UP INSTRUCTIONS FOR 3678 SCREEN CHANNEL SYSTEM

High Frequency Horn Bracket assembly:

 

 

The horn bracket that is shipped with the 3678-HF kit provides aiming flexibility in all directions.  It requires
minor 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 bolt
One (1) 1/4”-20 nut with captive “star” washer
One (1) #8-32x1/2” Philips pan head bolt
One (1) #8-32 nut with captive “star” washer
One (1) cable assembly for connecting HF driver to network

Be 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 from
the top of the enclosure*, and use it to fasten the L-shaped clamp base
to the cabinet so that the section with five holes is on the left-hand
side, as you face the enclosure (see diagram).  Note that although the
T-nut on the top of the enclosure may appear to be off-center, the
upright section of the “L” is on the centerline, when properly positioned

   

and 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 Philips
pan-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 positioning
holes, 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 by
loosening clamp bolt, rotating the driver/horn within the clamp to
desired 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 low
frequency 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 for

 

 

suspension, 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 enclosure

main clamp bolt

+5 degrees

+3 degrees

-5 degrees

0 degrees

(shown with bottom section facing the viewer)

Clamp base

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