Extron electronics SF 8CT SUB User manual

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SF 8CT SUB Subwoofer • Setup Guide
This guide provides instructions for an experienced installer to install the Extron SF 8CT SUB
subwoofer and to make all connections. The subwoofer typically is installed above a suspended ceiling (having ceiling tiles).
Installation consists of the following operations:
• Installation Considerations
• Preparing the Installation Location
• Configuring the Speaker
• Mounting the Speaker
Installation Considerations
1 WARNING:
AVERTISSEMENT :
• Potential risk of severe injury.Installation and service must be performed by authorized personnel only.
• Risque potentiel de blessure grave ou de mort. L’installation et l’entretien doivent être effectués par le personnel
autorisé uniquement.
• Properly suspending equipment requires training and expertise. Improper rigging of suspended equipment can cause the speaker
to fall, resulting in death, personal injury, equipment damage, and legal liability. Installation must be carried out by fully qualied
installers, in accordance with all required safety codes and standards at the place of installation.
• Il est indispensable de disposer de compétences techniques pour pouvoir suspendre l’équipement. Une manipulation incorrecte
de l’équipement suspendu peut provoquer la chute de l’enceinte, entraînant la mort, des lésions corporelles, des dégâts
matériels, et engageant la responsabilité d’un individu. L’installation doit être effectuée par des installateurs hautement qualiés,
conformément à l’ensemble des codes et des normes de sécurité réglementaires sur le lieu de l’installation.
• The legal requirements for suspending equipment vary from country to country. Extron strongly recommends that you consult
your local safety standards ofce before installing any product. Extron also recommends that you thoroughly check any laws and
bylaws prior to installation.
• Les conditions juridiques relatives à la suspension d’équipements varient de pays en pays. Extron vous recommande vivement de
consulter les standards de sécurité en vigueur dans votre pays avant d’installer un produit. Extron vous recommande également
de vérier minutieusement toute loi et tout règlement avant l’installation.
ATTENTION:
• Installation and service must be performed by authorized personnel only.
• L’installation et l’entretien doivent être effectués par le personnel autorisé uniquement.
• This unit must be repaired by personnel trained by Extron or returned to Extron for repair.
• Cette unité doit être réparée par un technicien formé par Extron ou renvoyée à Extron pour réparation.
• All wiring and electrical connections must conform to all applicable building codes and local ordinances.
• Installation in a plenum-rated environment requires plenum-rated cable or conduit.
• If using secondary support cables, the installer provides the cables.
IMPORTANT:
IMPORTANT:
Go to www.extron.com for the complete
user guide, installation instructions, and
specifications before connecting the
product to the power source.
DANGER: This is the Danger style to use without bullets. The word “DANGER” must be 10
points regardless of other font size used.
• A statement in 75 bold that “<whatever> may result in Serious injury or death” must start a Danger statement.
DANGER:
Danger cont. The word “DANGER” must be 10 points regardless of other font size used.
• For a bullet that is for “sub bullets,” how does this look.
DANGER:
• <whatever> may result in Serious injury or death. This is the Danger bullet1 style. The word “DANGER” must be
10 points regardless of other font size used.
This is the Danger bullet1 cont style. The word “DANGER” must be 10 points regardless of other font size used.
• This is the Danger bullet 2 style. Use when space is an issue and having the wrap different helps save space.
The left indent is set at 0.25 inches. The word “DANGER” must be 10 points regardless of other font size used.
This is the Danger bullet 2 cont style.. The word “DANGER” must be 10 points regardless of other font size
used.
WARNING: This is a warning style. The word “WARNING” must be 10 points regardless
of other font size used.
CAUTION: This is a caution sytle. The word “CAUTION” must be 10 points regardless of other font size used.
ATTENTION: This is an Attention style. The word “ATTENTION” may be the same font size as the
rest of the attention statement.
• This This is an Attention style. The word “ATTENTION” may be the same font size as the rest of the attention statement.
NOTE: Note style
TIP: Tip Text
Tip Text, cont’d
• TIPS: •Tips Bullet
• Tips_Bullet Ind_1
• Tips_Bullet Ind_L2

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
Preparing the Installation Location
Suspended Ceiling
1. Power down all attached devices before proceeding.
2. Ensure that there is sufficient clearance above the ceiling tile for the unit to be installed.
3. Cut a hole for the speaker. Use the provided cutout template to outline the hole to be cut in the ceiling tile as described below.
a. Remove the ceiling tile.
b. To find the center of the tile, use a tape measure to measure the space between two opposite corners, and mark the half-way
point.
c. Position the center hole of the cutout template directly over the center of the tile that you marked in step3b.
d. Using the provided cutout template, trace a circle around the cutout template.
e. Cut out the circle traced on the ceiling tile.
f. Replace the tile in the ceiling.
4. Attach two V-rails and one C-ring across the tile above the hole cut in step 3, as shown below:
a. Assemble two V-rail half sections as follows: fit the tab of one end into the slot of the other end, then open the V-rail until it locks
together (see figure 2). Repeat this procedure for the other V-rail.
Figure 1. Assembling the V-rails
b. Remove a ceiling tile adjacent to the tile with the hole.
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.
d. Position the C-ring assembly on the two V-rails so that the C-ring is centered over the hole, as shown below.
step 3
step 4b

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C-ring
V
-rail
Figure 2. Positioning the C-ring assembly on the V-rails
e. Secure the C-ring to the V-rails using two screws.
5. Route the speaker wires through the ceiling tile hole.
Hard Ceiling
1. Power down all attached devices before proceeding.
2. Cut a hole for the speaker. Use the provided cutout template to outline the hole to be cut in the ceiling as described below.
a. Mark the location on the ceiling where the center of the speaker will be placed.
b. Position the center hole of the cutout template directly over the center mark.
c. Trace a circle around the cutout template.
d. Cut out the traced circle.
3. Fold one C-ring assembly in half and insert it through the hole in the ceiling.
4. Unfold the C-ring and center it over the hole with the flat side down.
Figure 3. Installing the C-ring
5. Route the speaker wires through the ceiling hole.

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
Configuring the Speaker
1. 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 to 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 inserts:
a. Using a screwdriver, rotate the locking arm so that the insert can be accessed.
Figure 4. Accessing the locking arm insert
a. Use a small screwdriver to pry and separate the insert from the locking arm, as shown below.
Figure 5. Prying off the locking arm insert
b. Repeat this process for the remaining three locking arms.
c. Rotate all four locking arms back into the speaker.

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2. Configure the cable/conduit access plate and captive screw connector:
Loosen the two side access plate screws and remove the plate before wiring the speaker.
Alternate
Knockout
Remove the
access plate.
Lift the
cover up.
Figure 6. Removing the cable/conduit access plate
3. Configure the access plate:
• If not using conduit: Route the speaker wires through the cable clamp.
• If using conduit: Remove the cable clamp and install the conduit into the plate opening. Secure the conduit to the plate with the
locking nut and pull the speaker wires from the conduit.
NOTE: The cover plate has an alternate hole available by removing the knockout.
4. Strip 0.2 inches (5 mm) from the wire ends.
5. Attach the speaker wires to the captive screw connector depending on the configuration, as illustrated by the following three methods.

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
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.
Number of Wires per
Connection Point
Maximum
Wire Gauge
1 12 AWG
2 16 AWG
4 18 AWG
Wire Gauge Table
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 7. Speaker Wiring Schemes
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.
• When connecting multiple speakers in 8-ohm mode, be sure that the combined rated impedance does not equal a
value less than the minimum rated impedance of the amplifier.
• Lors de la connexion de plusieurs enceintes en mode 8ohm, assurez vous que le niveau d’impédance combinée ne
soit pas équivalent à une valeur inférieure à l’impédance minimum de l’amplificateur.

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6. Insert the captive screw plug into the four-pole receptacle of the speaker.
• Using a cable clamp on the access plate:
Figure 8. Using a cable clamp
• Using a conduit adapter on the access plate:
Flexible Conduit Adapter
Figure 9. Using a conduit adapter
7. Replace the access plate and tighten the two retaining screws.
8. Tighten the cable clamp, if it was used.

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
Mounting the Speaker
Suspended Ceiling Mounting
The speaker can be installed into rigid material (mineral tile, gypsum board, sheetrock, etc.) or soft material, such as berglass.
1. Insert the speaker through the bottom of the hole in the ceiling tile that was cut in step 3 on page2 (“Preparing the
Installation Location”) with the wires out of the way.
2. Clamp the speaker to the C-ring by using a Phillips screwdriver to tighten the four locking arms to the C-ring (see figure 9).
Figure 10. Clamping the speaker to the C-ring
Tightening the locking arms into rigid material:
For rigid material use the Opti-TorqueTM indicator ring as a tightening guide.
NOTE: Each of the four locking arm screws uses an Opti-TorqueTM indicator ring. 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.
Figure 11. Stop tightening when the red ring falls
ATTENTION:
• To avoid damaging the speaker locking arms, do not overtighten the four screws.
• Ne pas trop serrer les quatre vis pour éviter d’endommager les bras de verrouillage de l’enceinte.

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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
ring must not to be used as a tightening guide due to the risk of overtightening.
ATTENTION:
• To avoid damaging or deforming soft ceiling material, tighten the locking arms to secure the speaker, but short of
causing the speaker to deform the flat mounting surface of the ceiling, as seen from below.
• Afin 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
3. Connect secondary support lines to the support loops on the sides of the speaker enclosure, as shown here.
Anchor end to suitable
secure points within the
solid and permanent
building structure.
Figure 12. Connecting a secondary support line
ATTENTION:
• Do not allow any slack in the secondary support lines.
• Ne laissez pas de mou au niveau du filin de sécurité secondaire.
4. Replace the adjacent ceiling tile that was removed in step 4b on page2.
5. Set the rotary tap selector switch to the appropriate setting using a small screwdriver.

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
ATTENTION:
• When setting the taps for a distributed (high impedance) system, do not tap the system above the rated power of
the amplifier.
• Lors de la mise en place des capteurs pour un système distribué (haute impédance), n’exploitez pas le système au
delà du niveau d’alimentation de l’amplificateur.
• When connecting multiple speakers in 8-ohm mode, be sure that the combined rated impedance does not equal a
value less than the minimum rated impedance of the amplifier.
• Lors de la connexion de plusieurs enceintes en mode 8ohm, assurez vous que le niveau d’impédance combinée ne
soit pas équivalent à une valeur inférieure à l’impédance minimum de l’amplificateur.
Adjust the Tap Selector
100 V
64W
OFF
32W
16W
32W
16W
8W
64W
8Ω
8Ω
OFF
70 V
Figure 13. Setting the rotary tap selector switch

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6. Set the LPF selector switch to the appropriate setting using a small screwdriver. The default position is LPF enabled. Disable the LPF
only if filtering will be set on a device upstream of the speaker. The LPF is fixed at 120 Hz.
Adjust the LF Selector Switch
LPF
120 Hz
OFF
Figure 14. Setting the LPF selector switch
7. Install the grille. Position the grille so that it covers the baffle of the speaker. Six small magnets secure the grille in place.
Speaker Grille
Figure 15. Installing the speaker grille
NOTE: Specific test points can be used to troubleshoot speaker system problems. Should problems be encountered,
please see Troubleshooting: Signal Test Points on page19.

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SF 8CT SUB Subwoofer • Setup Guide (Continued)
Hard Ceiling Mounting
Connect a secondary support line to the support loop on the back of the speaker enclosure, as shown below.
Anchor end to suitable
secure points within the
solid and permanent
building structure.
Figure 16. Connecting a secondary support line
1. With the wires out of the way, insert the speaker through the bottom of the hole in the ceiling that was cut in step 2 on
page13.
2. Clamp the speaker to the C-ring by using a Phillips screwdriver to tighten the four locking arms to the C-ring.
Figure 17. Clamping the speaker to the C-ring

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NOTE: Each of the four locking arm screws uses an Opti-TorqueTM indicator ring. 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.
Figure 18. Stop tightening when the red ring falls
ATTENTION:
• To avoid damaging the locking arms, do not overtighten the four screws.
• Ne pas trop serrer les quatre vis pour éviter d’endommager les bras de verrouillage.
3. Set the rotary tap selector switch to the appropriate setting using a small screwdriver (see figure 19).
ATTENTION:
• When setting the taps for a distributed (high impedance) system, do not tap the system above the rated power of
the amplifier.
• Lors de la mise en place des capteurs pour un système distribué (haute impédance), n’exploitez pas le système au
delà du niveau d’alimentation de l’amplificateur.
• When connecting multiple speakers in 8-ohm mode, be sure that the combined rated impedance does not equal a
value less than the minimum rated impedance of the amplifier.
• Lors de la connexion de plusieurs enceintes en mode 8ohm, assurez vous que le niveau d’impédance combinée ne
soit pas équivalent à une valeur inférieure à l’impédance minimum de l’amplificateur.
Adjust the Tap Selector
100 V
64W
OFF
32W
16W
32W
16W
8W
64W
8Ω
8Ω
OFF
70 V
Figure 19. Setting the rotary tap selector switch

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68-3512-50 Rev. A
06 21
© 2018 Extron Electronics — All rights reserved. www.extron.com
All trademarks mentioned are the property of their respective owners.
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.
4. Set the LPF selector switch to the appropriate setting using a small screwdriver. The default position is LPF enabled. Disable the LPF if
filtering is set on a device upstream of the speaker. The LPF is fixed at 120 Hz
Adjust the LF Selector Switch
LPF
120 Hz
OFF
Figure 20. Setting the LPF selector switch
5. Install the grille. Position the grille so that it covers the baffle of the speaker. Six small magnets secure the grille in place.
Speaker Grille
Figure 21. Installing the speaker grille
NOTE: Specific test points can be used to troubleshoot speaker system problems. Should problems be encountered,
please see the SF 8CT SUB User Guide.