The loudspeaker shall be Lowell #ES-52T. It shall include a high-performance 5-1/4" coaxial loudspeaker, ported bass reflex enclosure and press-fit grille for recessed ceiling/wall installation. Frequency response shall be 70Hz-20kHz ±6dB. Sensitivity for the system shall be 88.0dB log average at 1W/1M over the frequency response range, measured in half-space. The speaker shall be constructed of a polypropylene cone with rubber surround and a Mylar tweeter. The woofer magnet weight shall be a minimum of 10 oz. (283.5g) and the woofer voice coil diameter shall be 1" (25.47mm). The transformer shall have primary taps for 100V (16, 8, 4.2 watt); 70V (16, 8, 4, 2, 1 watt); and 25V (2, 1, .5, .25, .13 watt) with a selector switch mounted on the front under the grille that will include an 8 ohm transformer bypass position. The factory-mounted enclosure shall be 20-gauge steel (painted grey) with internal volume of 379 cu.in. It shall have a seismic restraint ring tie-point on the rear for use where required by code or ordinance. It shall feature four dog-mount ears that allow it to be mounted in a ceiling with a maximum thickness of 2.125" (54mm). A template shall be provided to assist in cutting mounting holes. A rear access cable or flexible conduit entrance strain relief shall be provided with a termination cavity that encloses a four-pin Phoenix-style connector. The connector shall include two terminals for input to the speaker and two parallel terminals for output to the next speaker in the string. The system shall include a C-ring for use in reinforcing the edge of drywall ceiling cutouts, or for use with the included support rails to guard against ceiling tile sag from speaker weight. Front baffle shall have a diameter note more than 9.84" (249.9mm). The unit shall also include a press-fit, fine mesh 20-ga. CRS grille with UV rated powder coating (epoxy white), and shall include a thin piece of white scrim and a grille-pulling tool.
- Driver: 5-1/4” coaxial driver with high-frequency Mylar tweeter/acoustic lens
- Transformer: 16W (tap selector behind grille). Taps for 25V, 70V or 100V speaker systems and 8ohm transformer bypass position
- Enclosure: Painted (grey) steel back-can with reversible mounting dogs
- Grille: Press-fit grille with scrim, pull-tool
- Mounting Aids: Plastic paint shield for driver, C-ring and support rails