Technology Showcase: Ceiling Loudspeakers
Dec 1, 2008 12:00 PM, By Bennett Liles
New features offer better control over positioning and environmental challenges.
EAW markets the CIS50 5.25in. coaxial loudspeaker for flush-mount ceiling installation in 70V or 100V systems. The coupled HF cone and LF cone produce a frequency response of 100Hz to 20kHz, and the steel backcan with cable glands provides a solid attachment and durable enclosure. The grille assembly attaches from behind the baffle, and the driver/baffle assembly installs in the premounted backcan with spring-loaded hardware.
HiFi Works offers the HFW8R as part of a home surround-sound system. The 8in. woofer is black polypropylene with a rubber surround, and the 1in. tweeter has a cloth dome with ferrofluid-cooled voice coil. These provide a frequency response of 40Hz to 20kHz ±3dB, a power-handling capacity of 10W to 125W, a sensitivity of 91dB, and a nominal 8Ω impedance. The unit requires a 9in. cutout and is sold in pairs. The patented Roto-lock system aids installation, and the unit carries a five-year warranty on parts and labor.
The CX-8021 from HTX Audio has an 8in. woofer using a woven black fiberglass cone with an inverted butyl surround, a 1 1/4in. high-temp Kapton voice coil, and a 23oz. magnet. Highs are produced by a Neodymium ferrofluid soft-dome tweeter with a 1in. high-temp aluminum voice coil. These and the two-way, 12dB/octave 5000Hz crossover provide a frequency response of 55Hz to 22kHz ±3dB, a power-handling capacity of 80W RMS, and 160W peak along with a sensitivity of 90dB. The spring-loaded binding post terminals are suitable for loudspeaker wire up to 14 gauge.
Incorporating new technology in the form of ceramic metal matrix diaphragms (CMMD) for resonance-free response across their frequency range, maximum radiating surface (MRS) flatpanel transducer, a boundary compensation switch, and tweeter level controls, the ERS610 from Infinity Systems — a Harman company — has an 80Hz to 20kHz frequency response ±3dB, an 85dB sensitivity figure, 8Ω nominal impedance, 24dB per octave crossovers at 700Hz and 2kHz, and a recommended amplifier power range of 20W to 200W. The ERS610 also features dual 3in. midrange drivers, a 7 3/4"×3 3/8" low-frequency driver, and a 1in. high-frequency driver with acoustical waveguide. For high power and precise directivity, the relatively large external diameter of 12 3/4in. provides a solid base for sound projection with a weight of only 8lbs. The CMMD diaphragm is made of a ceramic compound called “Alumina” that is three times stiffer than titanium and 85 times stiffer than felted paper that is found in many loudspeaker cones.
Using the same driver technology already popular with the Extreme series of ceiling loudspeakers from JA Audio, the new 6 1/2in. EX-206C provides a two-way system with a fiberglass woofer and titanium tweeter to deliver a frequency response of 55Hz to 20kHz and 5W to 100W power-handling capability. The woofer is a yellow fiberglass cone with a rubber surround and sits at a 20-degree angle using the ceiling infinite baffle for maximum efficiency. With an 8Ω internal impedance and 89dB sensitivity, the EX-206C incorporates a high-end, 18dB crossover adjustable for tweeter level ±3dB, and the 25mm titanium-dome tweeter swivels to offer custom directivity. The unit also comes with a white aluminum grille.
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