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SF 228T Plus • User Guide
The Extron SF 228T Plus Sound Field® 2-way ceiling speaker features a low
profile design that houses an 8-inch woofer and 1.1-inch dome tweeter and has
the appearance of a standard ventilation grill. All drivers and components above
the ceiling are hidden behind the grill.
The SF 228T Plus uses plenum rated ceiling spaces and can be mounted into a standard 2 feet x 2 feet or 2 feet x 4 feet (with
supplied t-rail crosspieces) false ceiling tile space on a T-bar grid, or, a frame installed in solid ceilings.
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. The Class A limits provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause interference. This interference must be corrected at the expense of the user.
NOTE:
For more information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related
topics, see the
"Extron Safety and Regulatory Compliance
Specifications
Product specifications are available on the Extron website, www.extron.com.
Features
•
Drop-in 2-way speakers for suspended ceilings.
•
UL-2043 plenum rated enclosure.
•
An 8-inch, (203 mm), full range woofer provides extended low frequency response.
•
A 1.1-inch, (28 mm), dome tweeter provides extended high frequency response.
•
The white perforated grille matches the appearance of air conditioning vents.
•
8 ohm direct or 70/100 Volt operation with 64, 32, 16, and 8 watt selectable power taps accessed with speaker wiring
connections inside the rear panel.
•
Frequency range of 59 Hz to 22 kHz.
•
90 watts continuous pink noise, 180 watts continuous program rated.
•
90° conical coverage.
•
Low profile enclosure for plenum environments.
•
5 year parts and labor warranty.
Guide" on the Extron website.
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Summary of Contents for Extron electronics SF 228T Plus
- Page 1 SF 228T Plus • User Guide The Extron SF 228T Plus Sound Field® 2-way ceiling speaker features a low profile design that houses an 8-inch woofer and 1.1-inch dome tweeter and has the appearance of a standard ventilation grill. All drivers and components above the ceiling are hidden behind the grill.
- Page 2 SF 228T Plus • User Guide (Continued) Application Example The following illustration shows one way to configure a system using the SF 228T Plus. Extron SF 228T Plus Plenum 2' x 2' Ceiling Speaker Extron SF 228T Plus Plenum 2' x 2'...
- Page 3 Installation This section discusses how to install the SF 228T Plus speaker and includes: Installation Considerations • • Installing the Speakers Wiring the Speakers • • Completing the Installation CAUTION: • Installation and service must be performed by authorized personnel only. •...
- Page 4 SF 228T Plus • User Guide (Continued) Routing cables through the terminal cover plate: When using flexible conduit — Insert the conduit into the cover plate opening using an appropriate conduit adapter, and secure the conduit to the plate (see figure 3).
- Page 5 Wiring the Speakers Inside the speaker compartment, red (+) and black (-) speaker wires are pre-attached to separate three-pole splicing connectors. Figure 5. Speaker Wires with Splicing Connectors Route the two red and black power amplifier or speaker wires through the cable access opening. if conduit is used, pull the wire ends out from the conduit casing.
- Page 6 SF 228T Plus • User Guide (Continued) To wire a second speaker — Measure the distance between the two speakers intended installlation points, add an extra foot or third of a meter for safety, and cut that length in speaker wire cable.
- Page 7 Ceiling tile installation — 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 in figure 12. Extron SF 228T Plus Two-way Ceiling Speakers 2' x 2'...
- Page 8 If seismic safety lines are being used, install them now. In addition to the tie off at and , Extron recommends a tie off on one of the four available tabs at . See the illustration below. C C C Anchor the safety cables D D D to a suitable secure point.
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