Technology Showcase: Ceiling Loudspeakers
Dec 1, 2008 12:00 PM, By Bennett Liles
New features offer better control over positioning and environmental challenges.
In Pioneer's Elite EX Series, the S-IC891A features Coherent Source Transducer (CST) technology, a three-dimensionally aligned sound source for the tweeter, and midrange to precisely control sound directivity at all frequencies. The woofer is an aramid/carbon composite shell cone, the midrange is a 5 1/2in. magnesium cone, and the tweeter is a 1 3/16in. ceramic graphite HSDOM type. These provide an overall frequency response of 26Hz to 100kHz with a sensitivity of 87dB. The maximum input power is 150W with an internal impedance of 6Ω and crossover frequencies of 480Hz and 2kHz.
The Polk Audio LC80fx is intended for surround systems and has a solid and diffuse imaging feature that helps create the desired surround effect. The unit can handle anywhere from 10W to 125W with a nominal impedance of 4Ω, a frequency response of 30Hz to 27kHz, and an efficiency (sensitivity) of 88dB. The midbass is produced by an 8in. polypropylene dynamic balance driver, while the highs emanate from the two ring radiator tweeters. Wiring connects to a pair of heavy-duty, spring-loaded push terminals.
The C1030 from Proficient Audio Systems is a three-way system using a 10in. Kevlar woofer in a cast-magnesium basket, a 3in. Kevlar midrange cone, and 1in. pivoting aluminum tweeter. There are contour switches to add or subtract 3dB from midrange and treble, 200W power-handling capacity, 40Hz-to-20kHz frequency response, nominal 4 impedance, and 92dB sensitivity. The required PCB-C1000 preconstruction/retro-fit bracket is included. This steel-bracket assembly facilitates mounting through the loudspeaker cut-out in existing construction. The unit weighs 14lbs. and requires a ceiling cutout of 11 7/8in.
The CW170FR fire-rated in-ceiling loudspeaker system from PSB Speakers is enclosed in a 20-gauge steel can that has a clamp suitable for sheathed or armored cable. The woofer is a 6 1/2in. polypropylene coned coaxial with a 3/4in. soft-dome pivoting tweeter. The system has a built-in 70V/100V transformer with three power settings and a fourth position that bypasses the transformer. The frequency response is 80Hz to 20kHz with a power-handling capability of 20W to 100W and an internal impedance of 8Ω. The sensitivity figure is 92dB, and the unit includes four dog-leg-style clamps for easy mounting.
The RBH Sound MC-815 has an 8in. aluminum-cone woofer and a 1in. aluminum-dome tweeter to provide a frequency response of 45Hz to 20kHz ±3dB, a sensitivity of 91dB, and a power-handling capacity of 15W to 150W. The swiveling tweeters have protection circuitry that automatically resets, and the 12dB-per-octave crossover at 2.5kHz delivers crisp highs to the two-way system. As with all RBH in-ceiling loudspeaker products, the MC-815 includes a swing-out, dog-leg mounting system with prestarted screws for easy installation.
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