SF 8CT SUB - Subwoofer Extron - Free user manual and instructions

USER MANUAL SF 8CT SUB Extron

Two black speaker modules side by side, one front and one back, with no visible text or symbols.

Extron

Safety Instructions

Safety Instructions • English

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

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, FlexOS, Glitch Free, Global Configurator, Global Scripter, GlobalViewer, Hideaway, HyperLane, IP Intercom, IP Link, Key Minder, LinkLicense, LockIt, MediaLink, MediaPort, NAV, NetPA, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, ShareLink, Show Me, SoundField, SpeedMount, SpeedSwitch, StudioStation, System INTEGRATOR, TeamWork, TouchLink, V-Lock, VideoLounge, VN-Matrix, VoiceLift, WallVault, WindoWall, XPA, XTP, XTP Systems, and ZipClip

Registered Service MarkSM: S3 Service Support Solutions

Trademarks(TM)

AAP, AFL (Accu-RATE Frame Lock), ADSP (Advanced Digital Sync Processing), AVEdge, CableCover, 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, FastBite, Flex55, FOX, FOXBOX, IP Intercom HelpDesk, MAAP, MicroDigital, Opti-Torque, PendantConnect, ProDSP, QS-FPC (QuickSwitch Front Panel Controller), Room Agent, Scope-Trigger, SIS, Simple Instruction Set, Skew-Free, SpeedNav, Triple-Action Switching, True4K, True8K, VectorTM 4K, WebShare, XTRA, and ZipCaddy

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.

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.

Contents

Introduction ....1

About this Guide....1

About the SF 8CT SUB .... 1

Features 2

Installation in a Suspended Ceiling...... 3

Installation Considerations .... 3

Preparing the Installation Location .... 3

Configuring the Speaker 5

Mounting the Speaker 8

Installation in a Hard Ceiling 13

Preparing the Installation Location 13

Configuring the Speaker 13

Mounting the Speaker 14

Reference Information......18

Painting the Speaker Grille....18

Troubleshooting: Signal Test Points....19

Testing Source Signal (All Configurations)......19

Testing the Impedance (Loop-Through

Configuration Only) 19

Introduction

• About this Guide
  • About the SF 8CT SUB
• Features

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:

Figure 1. Typical SF 8CT SUB Application

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
• 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.

• 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.

1. 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.

Technical diagram showing mechanical assembly steps with red arrows indicating motion and rotation, including a close-up of a component.

Figure 2. 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.

Position the C-ring assembly on the two V-rails so that the C-ring is centered over the hole, as shown below.

C-ring φ0 φ1 V-rail

Figure 3. Positioning the C-ring assembly on the V-rails

d. Secure the C-ring to the V-rails using four screws.

1. 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.

Technical diagram showing screwdriver installation on a cylindrical device with close-up views of the component and tool path.

Figure 4. Accessing the locking arm insert

b. Use a small screwdriver to pry and separate the insert from the locking arm, as shown below.

Diagram showing screwdriver inserted into a socket, with a close-up of the socket being inserted (no text or symbols present)

Figure 5. Prying off the locking arm insert

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.

Lift the cover up Remove the terminal cover. Alternate Knockout

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.

1. Strip 0.2 inches (5 mm) from the wire ends.
2. 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.

graph TD
    A["Power Amplifier"] --> B["Speaker 1"]
    B --> C["Speaker 2"]
    C --> D["Red (Red)"]
    C --> E["Black (Black)"]
    B --> F["LOOP R1 N LOOP"]
    C --> G["LOOP R2 N LOOP"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333

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.

graph TD
    A["Power Amplifier"] --> B["Speaker 1"]
    B --> C["Speaker 2"]
    C --> D["Red (Red)"]
    C --> E["Black (Black)"]
    B --> F["LOOP IN IN LOOP"]
    C --> G["LOOP IN IN LOOP"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333

Wiring a Single Speaker

graph TD
    A["Power Amplifier"] --> B["Speaker 1"]
    B --> C["Black Signal"]
    C --> D["Red Signal"]
    D --> E["Loop Indicator"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#ffc,stroke:#333

Wire Gauge Table

Number of Wires per Connection Point	Maximum Wire Gauge
1	12 AWG
2	16 AWG
4	18 AWG

Figure 7. Speaker Wiring Schemes

ATTENTION:

• Using a cable clamp on the access plate:

Technical line drawing of a cylindrical device with internal components and mounting brackets (no text or symbols)

Figure 8. Using a cable clamp

• Using a conduit adapter on the access plate:

Flexible Conduit Adapter

Figure 9. Using a conduit adapter

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

2. 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).

Technical diagram of a mechanical assembly with a cylindrical component and a magnified inset showing a close-up view (no text or symbols)

Figure 10. Clamping the speaker to the C-ring

Tightening the locking arms into rigid material:

For rigid material use the Opti-Torque ^™ 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.

Mechanical assembly diagram showing a screwdriver inserted into a circular component with a red arrow indicating rotation (no text or symbols present)

Figure 11. Stop tightening when the red ring falls

ATTENTION:

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 be used as a tightening guide due to the risk of overtightening.

ATTENTION:

Two mechanical assembly diagrams showing a bracketed structure with a cross symbol indicating a defect or failure (no text or labels present)

1. 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.

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

• Set the rotary tap selector switch to the appropriate setting using a small screwdriver.

ATTENTION:

Figure 13. Setting the rotary tap selector switch

1. 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.

LPF 120 Hz OFF Adjust the Tap Selector

Figure 14. Setting the LPF selector switch

1. 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.

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
- Configuring the Speaker
- Mounting the Speaker

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.

Metal ring-shaped object with attached fasteners, no visible text or symbols

Figure 16. Installing the C-ring

1. 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.

Anchor end to suitable secure points within the solid and permanent building structure.

Figure 17. 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 the previous page.

2. Clamp the speaker to the C-ring by using a Phillips screwdriver to tighten the four locking arms to the C-ring.

Technical diagram of a mechanical assembly with a magnified inset showing a close-up view of a component (no text or symbols present)

Figure 18. Clamping the speaker to the C-ring

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.

Technical diagram showing a mechanical assembly with a tool inserted into a circular component, annotated with red arrows indicating rotation or adjustment.

Figure 19. Stop tightening when the red ring falls

ATTENTION:

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

ATTENTION:

Figure 20. Setting the rotary tap selector switch

1. 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

LPF 120 Hz OFF Adjust the Top Selector

Figure 21. Setting the LPF selector switch

1. 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 22. 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.

Reference Information

This section covers the following topics:

• Painting the Speaker Grille
- Troubleshooting: Signal Test Points

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.

Speaker Grille

Figure 23. Removing the speaker grille

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

• Wait for the paint to dry.

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

graph TD
    A["Amplifier"] --> B["Red Wire (+) from Amplifier"]
    A --> C["Black Wire (-) from Amplifier"]
    C --> D["Test Points"]
    D --> E["+"]
    D --> F["-"]

Figure 24. Signal Test Points – Parallel Configuration

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.

graph TD
    A["Amplifier"] --> B["Red Wire (+) from Amplifier"]
    A --> C["Black Wire (-) from Amplifier"]
    C --> D["Test Points"]
    D --> E["To next speaker(s)"]

Figure 25. Impedance Test Points — Loop-through Configuration

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 Asia: 65.6383.4400

Europe: 31.33.453.4040 or 800.3987.6673 Japan: 81.3.3511.7655

Africa: 27.11.447.6162 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.