01.12.08

QSC speakers for small theatres

AUTHOR: Inavate

QSC bolstered its DCS (Digital Cinema Speaker) series with two loudspeakers, the SC-2150 and SR-8100. Both speakers are designed for small theatres.

The SC-2150 is a three-way, selectably passive full-range or bi-amplified screen channel loudspeaker comprised of two main units: a mid-high frequency system and a low frequency enclosure. The components can be assembled on-site via a pan and tilt bracket that mounts the mid-high components to the top of the LF enclosure.

QSC claims its patented Cine-Sight simplifies aiming of the horns for audience coverage. The mid-high system features a high output, horn-loaded 6.5” midrange cone driver and a 1.4” (35.6 mm) diaphragm compression driver.

The dual 15” (381 mm) low-frequency enclosure is built to address the extended low-frequency response required for cinema applications. The compact LF device is 14.5” (368 mm) deep, reducing the space required behind the screen. The enclosure is constructed of MDF panels and employs separate chambers for each transducer. This is designed to prevent over-excursion of the remaining transducer, caused by improper box loading, in the case of transducer theft or failure.

Bass ports are evenly spaced on each side of the transducers in a bid to ensure internal pressure within the enclosure is more uniform across the back surface of the drivers. This is designed to prevent the cone from being displaced to one side or another by unbalanced forces, reducing the chance of driving the voice coil out of the centre of the gap at high power.

The SC-2150 additionally includes a driver protection network and a passive crossover for bi-amp and full passive operation. Power limiter circuitry is claimed to protect the high-frequency and mid-frequency drivers from overpowering. A simple switch setting determines the operating mode and eliminates dual inventory and ordering issues associated with fixed bi-amp or passive models.

QSC’s SR-8100 cinema surround loudspeaker features a long-throw 8” low-frequency transducer coupled with a 1” soft dome tweeter. The system’s MDF enclosure incorporates a 15° down angle baffle and top-mounted terminals.