Extron SF 8CT SUB SoundField 8-Inch In-Ceiling Subwoofer User Guide

Extron SF 8CT SUB SoundField 8-Inch In-Ceiling Subwoofer

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

WARNING:

• Potential risk of severe injury. Installation and service must be performed by authorized personnel only.
• 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 qualified installers, in accordance with all required safety codes and standards at the place of installation.
• The legal requirements for suspending equipment vary from country to country. Extron strongly recommends that you consult your local safety standards office before installing any product. Extron also recommends that you thoroughly check any laws and bylaws prior to installation.

ATTENTION:-

• Installation and service must be performed by authorized personnel only.
• This unit must be repaired by personnel trained by Extron or returned to Extron for repair.
• All wiring and electrical connections must conform to all applicable building codes and local ordinances.
• Installation in a plenum-rated environment requires plenumrated cable or conduit.
• If using secondary support cables, the installer provides the cables.

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.
   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.

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.

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.
   Figure 6.    Removing the cable/conduit access plate

3. Configure the access plate:

4. If not using conduit: Route the speaker wires through the cable clamp.

5. 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.

6. Strip 0.2 inches (5 mm) from the wire ends.

7. Attach the speaker wires to the captive screw connector depending on the configuration, as illustrated by the following three methods.
   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 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.
   Wiring a Single Speaker
   Figure 7. Speaker Wiring Schemes
   **** Wire Gauge Table****

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.
  * 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.

6. Insert the captive screw plug into the four-pole receptacle of the speaker.

7. Using a cable clamp on the access plate:
   Figure 8. Using a cable clamp

8. Using a conduit adapter on the access plate:
   Figure 9.  Using a conduit adapter

9. Replace the access plate and tighten the two retaining screws.

10. Tighten the cable clamp, if it was used.

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 fiberglass.

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.
     Tightening the locking arms into soft material:
     Because fiberglass 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.

3. Connect secondary support lines to the support loops on the sides of the speaker enclosure, as shown here.
   Figure 12. Connecting a secondary support line
   ATTENTION:

4. Do not allow any slack in the secondary support lines.

5. Replace the adjacent ceiling tile that was removed in step 4b on page 2.

6. Set the rotary tap selector switch to the appropriate setting using a small screwdriver.
   ATTENTION:

   • When setting the taps for a distributed (high impedance) system, do not tap the system above the rated power of the amplifier.
   • 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.
     Figure 13.    Setting the rotary tap selector switch

7. 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.
   Figure 14.  Setting the LPF selector switch

8. Install the grille. Position the grille so that it covers the baffle of the speaker. Six small magnets secure the grille in place.
   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.

Hard Ceiling Mounting

Connect a secondary support line to the support loop on the back of the speaker enclosure, as shown below.

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
   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.

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.
   • 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.
     Figure 19.    Setting the rotary tap selector switch

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
   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.
   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.

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.

© 2018 Extron Electronics — All rights reserved. www.extron.com
All trademarks mentioned are the property of their respective owners.

References

• Extron - The AV Technology Leader

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