updated 01:37 pm EDT, Thu September 26, 2013
Balanced Mode Radiator drivers replace tweeters in Cambridge Audio speakers
Cambridge Audio has launched a new range of speakers for the home, one which it claims is an "entirely new approach" to speaker design. The Aero range uses Balanced Mode Radiator (BMR) drivers with conventional cone drivers, similar to the ones used in its Minx speakers, rather than the usual tweeters employed in more traditional designs.
Usually, the point where a speaker crosses over from the tweeter and the driver occurs at around 3kHz, somewhere that people can hear the difference. BMR drivers moves the point to 250Hz, far outside the typical hearing range and effectively eliminating the crossover for the listener. The BMR drivers also permits a clearer separation of duties for high and mid drivers, and those of lower frequencies, with that 250Hz crossover helping reduce the chance of hearing drivers with different characteristics overlapping.
The construction of the driver allows for more flexibility in speaker placement, with the BMR using the pistonic in-out motion of a tweeter as well as through surface vibration, which is said to provide the Aero speakers with a wider dispersion of sound.
There are five Aero speakers in the range, all available with the choice of black and dark walnut finishes. The Aero 2 bookshelf and stand-mount speakers, using 2.25-inch BMRs and a custom-designed 6-inch drivers, cost $549 per pair. The rear surround Aero 3, also at $549 a pair, opts for two 4-inch BMRs and can be used as a dual monopole or bipolar speaker.
The Aero 5 center speaker, priced at $449, is designed as a dialog speaker with a 2-inch BMR and two custom 5.25-inch drivers, while the Aero 6 floor-standing speakers use a 2.25-inch BMR and two 6-inch drivers in each unit, and is priced at $1,099 for a pair. The Aero 9 subwoofer, using a ten-inch subwoofer, a 10-inch down-firing Auxiliary Bass Radiator, and a 500W Class D amplifier, costs $899.