Brochure

Architectural Specifications:
The subwoofer loudspeaker shall be of in-ceiling design, consisting of a 200 mm (8.0 in) low frequency transducer in a Nested Chamber
TM
ported enclosure. The low
frequency voice coil shall be 38 mm (1½ in) in diameter and the coil former shall be of aluminum for maximum heat dissipation.
Performance specifications of a typical production unit shall be as follows: Measured sensitivity (SPL at 1m [3.3 ft] with 2.83V input, averaged from 60 Hz to 100 Hz) shall
be at least 95 dB-SPL (␲/2 loading). Usable frequency response shall extend from 42 Hz to 200 Hz (10 dB below rated sensitivity) with no external equalization. Rated power
shall be at least 100 watts continuous pink noise power, AES spectrum (shaped pink noise, 40 Hz to 400 Hz, with peak-to-average ratio of 6 dB) for a period of 100
continuous hours.
The system shall be protected against damage from occasional overpowering via full range series lamps that limit the power to the transducer (Control 19CS, not Control
19CST).
The backcan shall be constructed of formed steel and the baffle of UL94V-0 fire rated medium impact polystyrene. An enclosed terminal box shall be included proving
strain relief for use with either plenum-rated wire, ½ in (13 mm inside diameter) conduit, or flexible conduit up to 22 mm (⅞ in) outside diameter. The external wiring shall
be accomplished via a removable lockable wiring connector with screw-down terminals to provide both secure wire termination and prewiring capability before loudspeaker
installation. An attachment loop shall be provided on the back panel for tying to building structure as a secondary support point.
The system shall include a support backing plate to reinforce the ceiling material and tile support rails for use on either 2 x 4 ft or 600 x 1200 mm suspended ceiling tiles
and which can all be installed from beneath the ceiling tile.
Overall front face diameter shall not exceed 345 mm (13.6 in), overall depth from the bottom of the ceiling shall not exceed 318 mm (12.5 in).
Control 19CS: The loudspeaker shall weigh no more than 5.5 kg (12 lb) and nominal impedance shall be 8 ohms.
Control 19CST: The loudspeaker shall weigh no more than 6.3 kg (14 lb) and shall be equipped with a special subwoofer-capable transformer for use in either 70.7 or
100V distributed-line speaker systems, with taps selectable by rotary switch located on the front panel so that the speaker does not have to be removed to adjust tap settings.
Taps shall be nominally 75W @ 70V, 30W@ 70V (75W @ 100V), 15W @70V (30W @ 100V), and 7.5W @ 70V (15W @ 100V).
The loudspeaker shall be the JBL Model Control 19CS (Control 19CST).
Control19CS Nested Chamber
TM
Design
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