Technology Showcase: Ceiling Loudspeakers
Dec 1, 2008 12:00 PM, By Bennett Liles
New features offer better control over positioning and environmental challenges.
The JBL Control 47C/T uses a distinctive conical radiation boundary integrator to supply a waveguide for the 1in. soft-dome tweeter, while the 6 1/2in. polypropylene woofer with butyl-rubber surround and copper-clad coil projects through specially designed apertures in the RBI to provide an overall frequency response of 75Hz to 17kHz ±3dB. The large backcan on the unit assists with extended bass response. In 70V mode, the power taps allow 60W, 30W, 15W, and 7.5W settings. In bypass mode, the internal impedance is 8. The loudspeaker cable is attached with two removable locking 2-pin connectors with screw-down terminals. The Control 47C/T can handle 150W of continuous program power with a nominal sensitivity of 91dB.
The Klipsch CDT-3800-C uses a 1in. aluminum tweeter mated to a swiveling 100-degree Tractrix horn to produce an adjustable directivity that puts the sound where it is needed while having the loudspeaker mounted in the nearest available location. The 8in. woofer can rotate a full 360 degrees and then shift 15 degrees in any direction. Also featured is a treble contour switch, a frequency response of 56Hz to 20kHz ±3dB, a sensitivity of 92dB, nominal 8Ω impedance, a crossover frequency of 3455Hz, and a power-handling capacity of 50W (200W peak).
The CS10 ceiling-mounted subwoofer from Martin Audio is mounted in a fire-retardant MDF enclosure with a perforated steel grille and produces a maximum SPL of 115dB with a frequency response of 32Hz to 150Hz at -10dB. The unit has a nominal impedance of 8Ω and a sensitivity of 94dB. The connectors are rising-clamp plug-and-socket, and the grille is over-paintable.
The larger member of the Masterpiece Series from MAS Audio, the MAS-IC6, teams a 6 1/2in. woofer with a 1in. adjustable tweeter in a ported design to offer a frequency response of 55Hz to 20kHz at a sensitivity of 91dB. The unit can handle up to 150W and includes a ±3dB crossover switch to tailor the response. The unit is paintable and has push-type quick-connect clips for the wiring connections.
The Mirage Omnican OC-65 is designed for indoor or outdoor ceiling installation with a weather-resistant enclosure that mounts slightly below the plane of the ceiling to allow more coverage from its patented Omniguide technology. The Omniguide module rotates to direct sound to suit the coverage area. The pure-titanium hybrid (PTH) tweeter and the 6 1/2in. titanium-deposit propylene woofer with ribbed elliptical surround, along with the 2.5kHz crossover, enable a frequency response of 65Hz to 20kHz ±3dB with a sensitivity figure of 90dB. The unit includes a paintable grille and bezel.
The CM750DSC from Niles Audio is designed primarily as a center-channel loudspeaker featuring a 7in. woofer assembly that pivots up to 20 degrees to focus bass and midrange along with a twist-and-lock baffle and frame mechanism to help with easy mounting. The talc, carbon, and ceramic cone is extremely rigid to produce clean bass; it also includes a butyl surround for resonance damping. The bridge-mounted tweeter pivot mechanism allows the tweeter to pivot up to 20 degrees. A flush-mount MicroPerf aluminum grille adds aesthetics in the final installation. The unit offers a frequency response of 55Hz to 20kHz, a 8Ω nominal impedance, and power handling from 10W to 25W. Included are a two-position dialogue-enhance control and a three-position tweeter-level control.
Among the models in the Signature Series from NXG Audio, the NX-Si8522 dual voice coil ceiling-mount loudspeaker system includes a Titan metallic-anodized, graphite-filled, injection-molded woofer cone with a rubber surround for extended bass response. The Tetron tri-laminated, woven soft-dome tweeter and 12dB-per-octave crossover produce a frequency response of 35Hz to 21kHz and a sensitivity of 88dB. The internal impedance is 6Ω nominal and 4Ω minimum with a power-handling capacity of 10W to 150W.
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