Active/Passive Switch - L-Acoustics 12XT Manuel D'utilisation

12XT
COAXIAL ENCLOSURE
user manual
VERSION 1.2
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 and apply a low level LF sine wave sweep
(for example: 1 volt at 440 Hz) to ensure that the diaphragm is properly centered in the gap.
If not, slightly unscrew, center, screw, and make another test.
5. 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).
6. Install the loudspeaker assembly in the enclosure and screw in the 8 hex screws with grower and standard
washers: into each hex screw insert a grower washer and then a standard washer (following this order)
and screw in the assembly to one of the eight locations.
7. Install the grill (logo oriented towards the active/passive switch)
and screw in the 4 pozidrive screws (pay attention for the tissue to slide along the inside of the cabinetry).
8. Put in place both rubber bands on the grill.
8.3.3

Active/passive switch

If damaged, the active/passive switch (or head only) should be removed and replaced as described below.
Active/passive switch (or head only) removing and replacing procedure
1. Roll both rubber bands back away from the grill.
2. Remove the grill: remove the 4 pozidrive screws, lift up the grill (use the flat screwdriver).
3. Remove the loudspeaker coaxial assembly: remove the 8 hex screws with grower and standard washers,
lift up the loudspeaker (use the flat screwdriver).
4. Place the loudspeaker coaxial assembly with LF cone facing the table.
5. Remove the active/passive switch: unscrew the 2 hex screws, remove the head/plate/switch assembly from the
inside of the enclosure.
6. Select the ACTIVE setting: turn the head counterclockwise.
7. Lift the red tongue counterclockwise and separate the head/plate assembly from the switch.
8. Unscrew the plastic bolt (use pliers) and washer located under the plate and separate the head from the plate.
9. If the complete active/passive switch has to be replaced:
a. On the new active/passive switch, select the ACTIVE setting by turning the head counterclockwise,
lift the red tongue counterclockwise and separate the head from the switch.
b. On the old switch, slightly unscrew a cable locking screw and slide the cable out.
c. Immediately slide the cable in the corresponding location on the new switch, screw in to lock.
d. Repeat steps b and c for the 13 remaining cables.
10. On the new head, unscrew the plastic bolt and washer.
11. Install the new head on the metal plate, insert the plastic washer and then the bolt (in this order), screw in
the bolt so as to secure the head on the plate (use pliers).
12. Orient the head so as the white mark will be in the ACTIVE setting when the plate is mounted on the
enclosure (see Section 6.2).
!
CAUTION
12XT_UM_ML_1.2
All manuals and user guides at all-guides.com
This step is crucial as it will allow the final user to identify without error if the 12XT
is in the ACTIVE or PASSIVE setting
(remember that inverting these settings may definitely damage the transducers).
The orientation convention is described in section 6.2.
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