12XTI_UM_ML_1-0
w w w . l - a c o u s t i c s . c o m
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HF diaphragm replacing procedure
1.
Ensure that the voice coil gap on the driver is free from any particles. If necessary, clean out the gap by using 2-
sided tape.
2.
Install the new diaphragm in the gap.
3.
Install the back cover on the diaphragm.
4.
Screw in the 3 hex screws on the back cover (hex 4 mm, 3 N.m/27 in.lb
f
).
Note:
Balance the torques between
screws at every moment while screwing in so as to properly center the diaphragm.
5.
Apply a low level LF sine wave (for example: 1 volt at 440 Hz) to ensure that the diaphragm is properly
centered in the gap (the sound should remain pure and free of any unwanted noise). If not, slightly unscrew,
center, screw, and make another test.
6.
Connect both cables to both new diaphragm terminal posts: connect the
blue cable to the red terminal
post
and the
white cable to the black terminal post
(push on the spring-loaded terminal post, slide the
cable in, and release the terminal post).
7.
Install the loudspeaker assembly in the enclosure and screw in the 8 hex screws with split and flat washers:
into each hex screw insert a split washer and then a flat washer (
following this sequence
) and screw in the
assembly to one of the eight locations (hex 5 mm, 5 N.m/45 in.lb
f
).
8.
Install the grill (logo oriented towards the vents) and screw in the 4 Torx
®
screws (T30, 3 N.m/27 in.lb
f
).
8.4
Spare parts and recommended tools
Table 5: Main available spare parts
HS BC31 Diaphragm for 3’’ driver – 8 Ω
HP BC123 12’’ coaxial speaker – 8 Ω (including 3’’ driver)
HS BC123 12’’ recone kit
HR BC123 12’’ recone kit including factory service
SE GRL12XTI Complete front grill (black)
SE GRL12XTIW Complete front grill (Pure White RAL 9010
®
)
Table 6: Recommended tools for service
Torque wrench (N.m or in.lb
f
)
4 mm hex bit
5 mm hex bit
T30 Torx
®
bit
4 mm flat screwdriver
