Extron electronics BCK SF 26CT User manual

BCK SF 26CT • Setup Guide
This setup guide contains installation information about the BCK SF 26CT back-can. When installed and assembled together with
the DAK SF 26CT, they become a fully functional SF 26CT SoundField®XD 2-way speaker.
The complete assembly can be installed by a single-trade installation or a multi-trade installation procedure (see the SF 26CT
User Guide, available at www.extron.com, for details). The entire assembly is plenum rated.
WARNING: Potential risk of severe injury.Installation and service must be performed by authorized personnel only.
AVERTISSEMENT: Risque potentiel de blessure grave ou de mort. L’installation et l’entretien doivent être effectués
par le personnel autorisé uniquement.
NOTE: Installation of conduit and conduit adapters must conform to all applicable building codes and local ordinances.
1
Preparing the Installation Location
1. Power down all attached devices before proceeding.
2. Using the provided cutout template for the outline, cut
a hole for the BCK SF 26CT in the ceiling tile, as
described below.
NOTE: For hard ceiling installations:
Skip steps a through e and just use the
template to cut a hole in the ceiling.
a. Remove the ceiling tile, and draw diagonal lines
across it from opposite corners to locate its center.
Mark the intersection where the lines cross.
b. Position the center hole of the cutout template
directly over the center of the tile, marked in
step2a.
c. Trace a circle on the ceiling tile around the cutout
template.
d. Cut out the circle traced in the ceiling tile.
e. Replace the ceiling tile in the ceiling.
3. Attach two V-rails and one C-ring above the hole cut
in step 2, as described below.
NOTE: For hard ceiling installations:
• Fold one C-ring assembly in half and insert it
through the hole in the ceiling.
• Unfold the C-ring and center it over the hole
with the at side down.
• V-rails are not needed.
a. Assemble two V-rail half sections by fitting the tab
of one end into the slot of the other end. Open the
V-rail until it locks together (see figure 1). Repeat
this procedure for the other V-rail.
b. For ease of access, Remove a ceiling tile adjacent
to the cut tile.
c. Place both assembled V-rails on the cut ceiling tile
and position them equally on either side of the hole.
The ends of the V-rails go over the ceiling grid (see
figure 2, on next page).
Installing the BCK SF 26CT into a Suspended Ceiling
Figure 1. Assembling the V-rails

BCK SF 26CT • Setup Guide (Continued)
d. Position the C-ring assembly on the two V-rails so that
the C-ring is centered over the hole.
e. Secure the C-ring to the V-rails using two screws (see
figure 2).
4. Route the speaker wires through the ceiling tile hole.
5. Configure the locking arms for thicker ceilings
(optional).
Four speaker locking arms are used to secure the speaker
to ceiling tiles up to 2.25 inches (5.72 cm) thick. The
locking arms are equipped with removable inserts that
accommodate ceiling tiles of up to 1.5 inches
(3.81 cm) in thickness. For ceiling tiles thicker than
1.5 inches, the locking arm inserts must be removed.
To remove the insert:
a. Using a screwdriver, rotate the locking arm so that the
insert can be accessed (see figure 3).
b. Use a small screwdriver to pry and separate the insert
from the locking arm (see figure 4).
c. Repeat this process for the remaining three locking
arms.
d. Rotate all four locking arms back into the speaker.
6. Configure the cable/conduit access plate and
captive screw connector (see figure 5):
a. The cable/conduit access plate has one alternate hole
available covered by a knockout. This hole may be
used for loop out when using conduit. If this knockout
needs to be removed, do the following:
i. With the cable/conduit access plate still attached
to the speaker, place the tip of a flat-head
screwdriver against the notch of the knockout.
ii. Lightly tap the screwdriver with a hammer to
remove the knockout.
b. Loosen the two side cable/conduit access plate screws
and remove the cover.
c. Configure the cable/conduit access plate.
• When not using conduit: Route the speaker wires
through the cable clamp.
• When using conduit: Remove the cable clamp
and install the conduit into the access plate
opening. Secure the conduit to the plate with the
locking nut, and pull the speaker wires from the
conduit.
d. Strip 0.2 inches (5 mm) from the wire ends.
Figure 3. Accessing the Locking Arm Insert
2
Figure 4. Prying off the locking arm insert
Alternate
Knockout
Cable/conduit
Access Plate
Screws (2)
Cable
Clamp
Figure 5. Removing the cable/conduit access plate
C-ring
V
-rail
Figure 2. Secure the C-ring to the V-rails

3
e. Use one of three methods to attach the speaker
wires to the captive screw connector, depending on
the configuration (see figure 6).
ATTENTION:
• Do not tin the wire leads before installing into
the connector. Tinned wires are not as secure
in the connector and could be pulled out.
• Ne pas étamer les conducteurs avant de
les insérer dans le connecteur. Les câbles
étamés ne sont pas aussi bien xés dans le
connecteur et pourraient être retirés.
f. Insert the captive screw plug into the four-pole
receptacle of the speaker and screw it down.
If using a cable clamp to secure cabling, see
figure 7.
If using a conduit adapter to secure cabling, see
figure 8.
g. Replace the cable/conduit access plate and tighten
the two screws.
NOTE: The cable/conduit access plate can be
positioned in one of two ways, depending on
the application. Flip the plate to the desired
position with the wire openings either on the
side or on the top of the speaker enclosure
before tightening the screws.
OR
h. If used, tighten the cable clamp.
Number of
Wires per
Connection
Point
Maximum
Wire
Gauge
1 12 AWG
2 16 AWG
4 18 AWG
Wiring Multiple Speakers in Parallel
When a chain of speakers is wired this way,
disconnecting one speaker does not remove power
from the remaining speakers in the chain.
Speaker 1 Speaker 2
IN
–
LOOP
–
IN
+
LOOP
+
(Black)
(Red) (Red)
(Red)
(Black)
(Black)
Power Amplifier
Speaker 1 Speaker 2
(Black)
(Red) (Red)
(Black)
Power Amplifier
(Black)
(Red)
Speaker 1
(Red)
(Black)
Power Amplifier
IN
–
LOOP
–
IN
+
LOOP
+
IN
–
LOOP
–
IN
+
LOOP
+
IN
–
LOOP
–
IN
+
LOOP
+
IN
–
LOOP
–
IN
+
LOOP
+
Wiring Multiple Speakers Using Loop-through
When a chain of speakers is wired this way,
disconnecting one speaker removes power from all
downstream speakers.
Wiring a Single Speaker
1
2
3
Figure 6. Wiring the Captive Screw Connector
Cable Clamp
Figure 7. Using a Cable Clamp to Secure Cabling
Flexible Conduit Adapter
Figure 8. Using a Conduit Adapter to Secure Cabling

BCK SF 26CT • Setup Guide (Continued)
4
7. Mount the speaker back can enclosure
NOTE: For hard ceiling installations:
Attach the secondary support line (step 8, on the
next page) prior to mounting the speaker back
can enclosure in the hard ceiling.
a. Insert the back can through the hole in the ceiling
tile that was cut in step 2. Move the wires out of
the way to make this easier (see figure 9).
b. Clamp the speaker to the C-ring by using a Phillips
screwdriver to tighten the four locking arms to the
C-ring (see figure 10).
If tightening the locking arms into rigid material,
use the Opti-TorqueTM indicator as a tightening guide.
NOTE: Each of the four locking arm screws uses an
Opti-TorqueTM indicator. The indicator releases
a red plastic ring onto the screwdriver once the
screw is tightened to the correct torque.
Stop tightening any further when this occurs
to avoid overtightening the locking arms to the
C-ring.
ATTENTION:
• To avoid damaging the speaker, do not
overtighten the four locking arm screws.
• Pour éviter d’endommager l’enceinte, ne
serrez pas trop les quatre vis.
If tightening the locking arms into soft material:
Because berglass ceilings and other soft
materials are not as rigid as mineral tiles
and other hard materials, the Opti-Torque indicator
should not to be used as a tightening guide
due to the risk of overtightening.
Figure 9. Insert the Back Can into the Ceiling Tile
Figure 10. Tighten the Locking Arms to the C-ring

BCK SF 26CT • Setup Guide (Continued)
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All trademarks mentioned are the property of their respective owners.
Worldwide Headquarters: Extron USA West, 1025 E. Ball Road, Anaheim, CA 92805, 800.633.9876
For information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics, see the
Extron Safety and Regulatory Compliance Guide on the Extron website.
68-2223-51 Rev. A
02 19
5
ATTENTION:
• To avoid damaging or deforming soft ceiling
material, tighten the locking arms to secure
the speaker, but do not overtighten to prevent
damaging the at mounting surface of the
ceiling (see image below).
• An de ne pas endommager ni d’altérer
un plafond souple, serrez les bras de
verrouillage pour sécuriser l’enceinte, en
veillant cependant à ce que l’unité ne cause
l’altération de la surface de montage plane du
plafond, comme illustré ci-dessous.
X
8. If required, attach a secondary support line.
a. Connect a secondary support line to the support loop
on the back of the speaker enclosure (see figure 11).
ATTENTION:
• Do not allow any slack in the secondary
support line.
• Ne laissez pas de mou au niveau du filin de
sécurité secondaire.
b. Replace the adjacent tile that was removed in
step 3.
9. Repeat all steps for all the speakers.
The back cans are now ready for installation of the speaker driver (DAK SF 26CT).
Anchor end to suitable
secure points within the
solid and permanent
building structure.
Figure 11. Attach Secondary Support Line