SF 228T Plus

SF 228T Plus

1. Provide a two-way ceiling tile speaker with a drop-in plenum enclosure for suspended ceilings that shall provide an internal transformer.
   1. Two-way ceiling tile speaker with single-ported, drop-in plenum rated enclosure, and an internal transformer for 8 ohm direct and 70/100 volt operation
      1. Driver Requirements
         1. Shall consist of an 8” coaxial driver
            1. 8" (203 mm) polypropylene cone woofer
            2. 1.1" (28 mm) silk dome tweeter
      2. Performance Requirements
         1. Shall provide a frequency range of 47 Hz to 22 kHz, -10 dB below average SPL, measured on-axis in half space
         2. Shall provide a power capacity of 90 watts (rms) continuous pink noise per IEC 60268-5 and 180 watts (rms) continuous program
         3. Shall provide a nominal sensitivity of 89 dB SPL (1 W, 1 m) measured in half space
         4. Shall provide a nominal impedance of 8 ohms
         5. Shall provide a crossover frequency of 2.5 kHz
      3. Electrical Requirements
         1. Shall support 8 ohm direct or 70/100 volt connection from power amplifiers
         2. Shall provide toolless speaker wiring connections inside the rear panel
            1. Shall support one incoming and one outgoing high impedance speaker level signal
            2. Shall support a maximum wire gauge of 12 AWG
         3. Shall provide a rear panel rotary switch for selecting 8 ohm direct operation, or for selecting a power tap for 70/100 volt operation
            1. Shall provide power taps for 70 volt operation, including 64, 32, 16, and 8 watts
            2. Shall provide power taps for 100 volt operation, including 64, 32, and 16 watts
      4. Enclosure Requirements
         1. Shall consist of a 2' x 2' (61 cm x 61 cm) composite, square enclosure with a white, perforated steel grille
         2. Shall measure 23.75" (60.3 cm) in width
         3. Shall measure 23.75" (60.3 cm) in length
         4. Shall measure 5.41" (13.7 cm) in depth
         5. Shall weigh 18.9 lbs (8.6 kg) per speaker
      5. Mounting Requirements
         1. Provide the option of installing into a plenum or non-plenum ceiling
         2. Shall drop into 2' x 2' (61 cm x 61 cm) or 2' x 4' (61 cm x 122 cm) US style suspended tile ceilings
      6. General Requirements
         1. Shall be sold in pairs
         2. Shall meet regulatory compliances
            1. Shall meet safety compliances under CE, UL 2043, CAN/ULC-S142:16, UL 1480A, NFPA 90A, NFPA 70
            2. Shall be UL 2043 and CAN/ULC-S142:16 listed for heat and smoke release
            3. Shall meet UL 1480 for commercial and professional audio systems
            4. Shall comply with environmental requirements of RoHS and WEEE
         3. Shall provide five years parts and labor warranty
   2. Approved device shall be the Extron SF 228T Plus, part number 60-1862-03; no alternates or equals.