Extron SF 8CT SUB 8 Inch Ceiling Subwoofer User Guide

SF 8CT SUB 8 Inch Ceiling Subwoofer
User Guide

SF 8CT SUB 8 Inch Ceiling Subwoofer

SF 8CT SUB
Sound Field 8” In-Ceiling Subwoofer

Safety Instructions

WARNING: This symbol, , when used on the product, is intended to alert the user of the presence of uninsulated dangerous voltage within  the product’s enclosure that may present a risk of electric shock.
ATTENTION: This symbol, , when used on the product, is intended to alert the user of important operating and maintenance (servicing) instructions in the literature provided with the equipment.
For information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics, see the Extron Safety and Regulatory Compliance Guide, part number 68-290-01, on the Extron website, www.extron.com
Copyright
© 2021 Extron. All rights reserved. www.extron.com
Trademarks
All trademarks mentioned in this guide are the properties of their respective owners.
The following registered trademarks (®), registered service marks (SM ), and trademarks ( TM ) are the property of RGB Systems, Inc. or Extron (see the current list of trademarks on the Terms of Use page at www.extron.com):
Registered Trademarks(®)
Extron, Cable Cubby, ControlScript, CrossPoint, DTP, eBUS, EDID Manager, EDID Minder, eLink, Flat Field, Flexors, Glitch Free, Global Configurator, Global Scripter, Global Viewer, Hideaway, Hyper Lane, IP Intercom, IP Link, Key Minder, Link License, LockIt, Media Link, Media Port, NAV, Neta, Plenum Vault, Pole Vault, Power Cage, PURE3, Quantum, ShareLink, Show Me, Sound Field, SpeedMount, SpeedSwitch, StudionStation, System INTEGRATOR,  TeamWork, Touch Link, V‑Lock, VideoLounge, VN‑Matrix, Voice Lift, WallVault, WindoWall, XPA, XTP, XTP Systems, and Zip Clip
Registered Service Mark (SM) : S3 Service Support Solutions
Trademarks ( ™ ) AAP, AFL  (Accu‑RATE Frame Lock), ADSP (Advanced Digital Sync Processing), Avenged, Cable Cover, CDRS (Class D Ripple Suppression), Codec Connect, DDSP (Digital Display Sync Processing), DMI (Dynamic Motion Interpolation), Driver Configurator,  DSP Configurator, DSVP (Digital Sync Validation Processing), EQIP, Everlast, Fast Bite, Flex55, FOX, FOXBOX, IP Intercom Help Desk, MAAP, Micro Digital, Opti‑Torque, Pendant Connect, ProDSP, QS‑FPC (QuickSwitch Front Panel  Controller), Room Agent, Scope‑Trigger, SIS, Simple Instruction Set, Skew‑Free, SpeedNav, Triple‑Action Switching, True4K, True8K, Vector™ 4K, WebSphere, XTRA, and Zip Caddy
FCC Class B Notice
NOTE: This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including  interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits provide reasonable protection against harmful interference in a residential installation.  This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. There is no guarantee that interference  will not occur. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, you are encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

In order to maintain compliance with FCC regulations, shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of the manufacturer could void the user’s authority to operate this equipment.
NOTE: For more 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.
Conventions Used in this Guide
Notifications
The following notifications are used in this guide:
WARNING: Potential risk of severe injury or death.
ATTENTION:
• Risk of property damage.
NOTE: A note draws attention to important information.
Specifications Availability
Product specifications are available on the Extron website, www.extron.com.
Extron Glossary of Terms
A glossary of terms is available at http://www.extron.com/technology/glossary.aspx.

Introduction

About this Guide
This guide describes the Extron SF 8CT SUB, a subwoofer that is typically installed above a suspended ceiling with limited vertical clearance. This guide describes how to install, operate, and configure the subwoofer.
About the SF 8CT SUB
The SF 8CT SUB (see figure 1 on the next page) is a plenum-rated, 8 ohm, direct-radiating, ported subwoofer, featuring a 14.5” (368 mm) composite back can for use in plenum-rated ceiling environments.
The subwoofer has a frequency range of 40 Hz to 325 Hz -10 dB, half space, LPF enabled.
The SF 8CT SUB is compatible with any Extron low impedance amplifier with sufficient output drive power. The unit is UL 2043 Listed for use in air- handling spaces.
The subwoofer is intended for use in a bi-amplified system. Separate amplifiers should power the low and high frequencies.

ATTENTION:

• The SF 8CT SUB is UL Listed for use in plenum airspaces: meets UL 2043 for heat and smoke release.
• Suitable for use in environmental air space in accordance with Section 300-22(C) of the National Electrical Code, and Sections 2-128, 12-010(3) and 12-100 of the Canadian Electrical Code, Part 1, CSA C22.1.
• The product has been additionally investigated to UL 2043, “Fire Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces”.

Features

• 8” (203 mm) low frequency driver in a tuned port enclosure
• Frequency Range: 440 Hz to 325 Hz -10 dB, half space, LPF enabled
• 100 watts continuous pink noise
• 200 watts continuous program
• 8 ohm direct or 70/100 volt operation —
• 8 ohm direct
• 70 volt: 64, 32, 16, and 8 watt selectable
• 100 volt: 64, 32, and 16 watt selectable
• Selectable 120 Hz Low Pass Filter — 6 dB per octave
• UL 2043 plenum rated
• Magnetically attached grille with a thin bezel for a refined appearance
• Locking arms support ceilings up to 2.25 inches (57.1 mm) thick.
• Grille and bezel are white and can be painted to match any environment
• Modular V-rail and folding C-ring kit included
• Side oriented cable/conduit access plate can be for connection clearance
• Opti-Torque indicator rings prevent overtightening of locking arm screws
• Four locking arms for quick ceiling installation
• UL 1480 listed for safety
• 5-year parts and labor warranty

Installation in a Suspended Ceiling

This section describes the installation and the operation of the SF 8CT SUB in a suspended ceiling (having ceiling tiles). Topics in this section include:

Installation Considerations
WARNING: Potential risk of severe injury. Installation and service must be performed by authorized personnel only.

• 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.

Preparing the Installation Location

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. 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.
   Position the C-ring assembly on the two V-rails so that the C-ring is centered over the hole, as shown below.d. Secure the C-ring to the V-rails using four screws.

5. Route the speaker wires through the ceiling tile 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.b. Use a small screwdriver to pry and separate the insert from the locking arm, as shown below.c. Repeat this process for the remaining three locking arms.
   d. 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.
   To remove the plate:
   a. Lift the cover up.
   b. Remove the terminal cover.

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.
   Wiring Multiple Speakers Using Loop-through
   When a chain of speakers is wired this way, disconnecting one speaker removes power from all downstream speakers. 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. Replace the access plate and tighten the two retaining screws.

8. Tighten the cable clamp if it was used.

Mounting the Speaker
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 3 (“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). Tightening the locking arms into rigid material:
   For rigid material use the Opti-Torque TM indicator ring as a tightening guide.
   NOTE: Each of the four locking arm screws uses an Opti-Torque 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. 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. ATTENTION:
   • Do not allow any slack in the secondary support lines.

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

5. 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.

6. 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.

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

Installation in a Hard Ceiling

To install the SF 8CT SUB in a hard ceiling (having no ceiling tiles), with the ceiling structure in place, follow the steps in this section.
Topics in this section include:

Preparing the Installation Location

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.

5. Route the speaker wires through the ceiling hole.

Configuring the Speaker
Follow the steps in Configuring the Speaker on page 5.

Mounting the Speaker

1. Connect secondary support lines to the support loops on the rear of the speaker enclosure, as shown below.

2. 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 the previous page.

3. Clamp the speaker to the C-ring by using a Phillips screwdriver to tighten the four locking arms to the C-ring. NOTE: Each of the four locking arm screws uses an Opti-Torque TM 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. ATTENTION:
   • To avoid damaging the locking arms, do not overtighten the four screws.

4. Set the rotary tap selector switch to the appropriate setting using a small screwdriver (see figure 20 on the next page).
   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.

5. 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

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

Reference Information

Painting the Speaker Grille
The speaker grille can be painted using spray paint. Ensure that the spray paint is plastic friendly and adheres to both metal and plastic.
NOTE: Extron is not responsible for any alterations made to the original paint.
To paint the grille:

1. Remove the grille from the speaker.

2. Remove and set aside the scrim from the back side of the grille.

3. Spray paint the front side of the grille.
   NOTES:
   • Do not paint the back side of the grille.
   • Apply an even coat across the entire front surface.
   • Be sure not to clog the grille holes.

4. Wait for the paint to dry.

5. Reattach the scrim to the back of the grille.

6. Reattach the grille to the speaker.

Troubleshooting: Signal Test Points
The following signal test points can be used to troubleshoot speaker system problems.
Testing Source Signal (All Configurations)
The source signal can be tested by connecting to the inner + (IN) and – (IN) terminals of the captive screw connector. Testing the Impedance (Loop-Through Configuration Only)
The impedance of the speakers downstream of the one being tested can be measured while the system is on. To do this, connect to the outer (LOOP) terminals of the captive screw connector, as shown below.

Extron Warranty

Extron warrants this product against defects in materials and workmanship for a period of three years from the date of purchase. In the event of malfunction during the warranty period attributable directly to faulty workmanship and/or materials, Extron will, at its option, repair or replace said products or components, to whatever extent it shall deem necessary to restore said product to proper operating condition, provided that it is returned within the warranty period,  with proof of purchase and description of malfunction to:

USA, Canada, South America, and Central America:
Extron
1230 South Lewis Street
Anaheim, CA 92805
U.S.A.| Asia:
Extron Asia Pte Ltd
135 Joo Seng Road, #04-01
PM Industrial Bldg.
Singapore 368363
Singapore| Japan:
Extron, Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
---|---|---
Europe:
Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands| China:
Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China| Middle East:
Extron Middle East
Dubai Airport Free Zone
F13, PO Box 293666
United Arab Emirates, Dubai

Africa:
Extron South Africa
South Tower
160 Jan Smuts Avenue
Rosebank 2196, South Africa
This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care, electrical or mechanical abuse, abnormal operating conditions, or if modifications were made to the product that were not authorized by Extron.
NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA (Return Authorization) number. This will begin the repair process.
USA: 714.491.1500 or 800.633.9876
Europe: 31.33.453.4040 or 800.3987.6673
Africa: 27.11.447.6162
Asia: 65.6383.4400
Japan: 81.3.3511.7655
Middle East: 971.4.299.1800
Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of loss or damage during shipment. Returned units must include the serial number and a description of the problem, as well as the name  of the person to contact in case there are any questions.
Extron makes no further warranties either expressed or implied with respect to the product and its quality, performance, merchantability, or fitness for any particular use. In no event will Extron be liable for direct, indirect, or consequential damages resulting from any defect in this product even if Extron has been advised of such damage.
Please note that laws vary from state to state and country to country, and that some provisions of this warranty may not apply to you.

Worldwide Headquarters: Extron
USA West, 1025 E. Ball Road, Anaheim,
CA 92805, 800.633.9876

References

• Manual-Hub.com - Free PDF manuals!
• Extron - The AV Technology Leader
• Glossary of Terms | Extron
• Manual-Hub.com – Free PDF manuals!

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