User Guide Audio Products SF 228T 2’ x 2’ Ceiling Speakers 68-2018-01 Rev.
Safety Instructions • English Warning This symbol is intended to alert the user of important operating and maintenance (servicing) instructions in the literature provided with the equipment. Power sources • This equipment should be operated only from the power source indicated on the product. This equipment is intended to be used with a main power system with a grounded (neutral) conductor. The third (grounding) pin is a safety feature, do not attempt to bypass or disable it.
FCC Class A Notice This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation.
Conventions Used in this Guide In this user guide, the following are used: NOTE: A note draws attention to important information. TIP: A tip provides a suggestion to make working with the application easier. CAUTION: WARNING: A caution indicates a potential hazard to equipment or data. A warning warns of things or actions that might cause injury, death, or other severe consequences. Copyright © 2011 Extron Electronics. All rights reserved.
Contents Precautions/Safety Instructions..............................ii FCC Information.................................................. iii Copyright, and Trademark Information................ iv Introduction............................................................ 1 About this User Guide......................................... 1 Features............................................................... 1 Application Example............................................ 2 Installation...................
SF 228T Speaker System • Contents vi
Introduction About this User Guide This user guide contains information about the Extron SF 228T 2-way ceiling speakers. The SF 228T features a low profile design that houses an 8-inch woofer and 1-inch dome tweeter and has the appearance of a standard ventilation grill. All drivers and components above the ceiling are hidden behind the grill.
Application Example The following illustration is an application example. Extron DXP 44 HDMI ACT LINK RESET HDMl Matrix Switcher LAN OU TP RS-232 4 S UT TouchLink™ 3 2 ® 100 INPUT 1 IR RX IPL 250 PU LINK 3 ACT 1 4 3 4 2 Projector 4 2 3 4 TS Control System 2 1 TX 1 2 R IN RELAY 3 1 COM TCP/IP 3 VCR DVD 2 DOC CAM LAPTOP PC Extron DMP 64 1 Laptop US ED LIST 3 1T2 . I.T.
Installation This section discusses how to install the SF 228T speaker and includes: • Installation Considerations • Installing the Speakers • Speaker Cabling • Completing the Installation CAUTION: Installation and service must be performed by authorized personnel only. Installation Considerations • Installation of conduit and conduit adapters must conform to all applicable building codes and local ordinances.
3. Remove the terminal cover plate — Loosen (do not remove) the two screws in the keyhole slots on the top terminal cover plate and remove the cover plate as shown below. Loosen, but do not remove the terminal cover plate screws in the two keyhole slots. Terminal Cover Plate Figure 2. Remove Terminal Cover Plate 4. Routing cables through the terminal cover plate — The plate is mounted to the speaker with the transformer side down. a.
b. When using speaker wires without conduit — Secure the cable clamp adapter (included) to the cover plate and insert the wires through the clamp, (see the illustration below). Cable Clamp Adapter (Included) Terminal Cover Plate Seismic Cable Pass Through Loop Rear of Speaker Speaker Terminal Figure 4.
1. Flip the terminal cover plate so the transformer side is up. (Black) To Speaker . Terminal N C (Red) To Speaker , Terminal W W 2 4 4 W 8 W 8 W W 16 16 W W 32 32 C N C O M Transformer Terminal Block Cable Access Opening W W 2 Transformer C O M 70 0V V 10 Tap Label To Second Speaker Black (-) Red (+) Black (-) Red (+) From Amplifier (70V/100V) Figure 6. Terminal Cover With Transformer Side Exposed a.
e. To wire additional speakers, route the speaker wires from the second speaker through the cover plate hole to the transformer side. Twist the black negative (–) wires together and the red positive (+) wires together before inserting them into the terminal block. Additional speakers can be daisy-chained this way. See below. Pay close attention to the polarity of the wires. Do not mix negative and positive wires.
Direct 8 Ohm Connection to an Amplifier 1. An amplifer 8 ohm speaker output can be directly connected to the speaker terminal of the SF 228T, (see the diagram below). Black Wire Red Wire From Amplifier Terminal Cover Plate From Amplifier Black Wire Red Wire Rear of Speaker Direct 8 ohm Connection (Bypassing the Transformer) Speaker Terminal Figure 10. Direct Amplifier Connection to Speaker 2.
Completing the Installation NOTE: Observe all applicable building codes and local ordinances when installing the speaker. 1. For installation in a 2 feet x 2 feet ceiling tile, remove a tile and place the speaker on the existing support rails as shown below. Extron SF 228T Two-way Ceiling Speakers 2' x 2' Ceiling Tile Ceiling Tile Rails Figure 12. 2 Feet x 2 Feet Ceiling Tile Installation For installation in a 2 feet x 4 feet ceiling tile, remove a tile and cut the tile in half.
2. If seismic safety lines are being used, install them now. In addition to the tie off at 4c, Extron recommends tie offs on at least two at the four available tabs at 4e. See the illustration below. 4f Anchor the safety cables to a suitable secure point. 4c Attach a safety cable to a line retainer loop at either 4c or 4d. 4d Seismic Safety Cable Bend tab up. CAUTION: 4e Attach the seismic safety cable to either tab. Repeated bending may cause the tab to break off. Figure 14.
Specifications, Dimensions and Packaging This section discusses the specifications, part number, and packaging for the SF 228T speakers.
Vibration ���������������������������������������� ISTA 1A in carton (International Safe Transit Association) Regulatory compliance Safety �������������������������������������� NFPA90A, NFPA70; UL Listed for use in plenum airspaces: meets UL 2043 for heat and smoke release, meets UL 1480 for commercial and professional audio systems Warranty ���������������������������������������� 5 years parts and labor NOTE: All nominal levels are at ±10%. NOTE: Specifications are subject to change without notice.
Dimensions 23.75" 23.75" 5.
Packaging SF 228T Setup Guide Top Cap Rail Tube End Cap Ceiling Tile Rails Speakers Protective Sheet Bottom Cap SF 228T Speaker System • Reference 14
Extron® Warranty Extron Electronics warrants this product against defects in materials and workmanship for a period of three years from the date of purchase.
