154 EXPO
THE AUDITION ISTANBUL
Bose chose the balmy setting of Istanbul in mid-May to showcase its latest solution for fixed installation applications; a new progressive directivity module loudspeaker series and configurable power amplifiers. The event was shrouded in secrecy, building mondo*dr’s anticipation for what would be revealed. Traffic from a local football match meant that the journey to the hotel took longer than expected, but the levels of organisation and comfort eased the wait. That evening was all about fine dining and conversation; unsurprisingly, the chat between Bose staff, distributors and press was about the following day’s big reveal. A tour of the city in the morning confirmed everything you hear about how beautiful Istanbul is, before the group headed to the Tim Show Centre for the main event... to see the new kit in action. “Our engineers challenged conventional wisdom for both loudspeaker and amplifier design,” said Akira Mochimaru, General Manager, Bose Professional Systems Division about the new products. “The result is a new approach for the industry, one that lets sound designers and integrators meet the acoustic challenges of any fixed-installation sound system with more flexibility and far less compromise to audio performance.” RoomMatch is a new series of loudspeakers, which sees Bose enter into a new category of curvilinear array. The modules come in 15 different coverage patterns, which can be used independently or in various RoomMatch module combinations. The idea, according to Bose, is that the product will ‘overcome the acoustic perfor- mance limitations of conventional line array and point source loudspeakers’. Each of the loudspeakers is configured with a waveguide pattern that is then matched to the area that it covers, resulting in a customised solution. Each loudspeaker features two new 10-inch (25.4cm) woofers and six extended mid-range compression drivers. Together, they are designed to eliminate the need for the mid / high crossover, resulting in improved vocal clarity and intelligibility. To reduce distortion, the woofer uses a proprietary ultra-linear motor, a tapered port,
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and an individual acoustic enclosure, while the compression drivers have a propri- etary Bridge Phase Plug to remove resonant modes, without the use of FIR filters or complex signal processing. Sound designers can scale SPL by creating a Bose Progressive Directivity Array to achieve a consistent response over almost any vertical angle. This is accomplished with a Continuous-Arc Diffraction-Slot (CADS) manifold - a Bose invention and an industry first - that provides interference-free acoustic summation of six compres- sion drivers, and the ability to define precise vertical coverage between 0° and 60° for each RoomMatch module. For bass augmentation below 80Hz, the new RoomMatch RMS215 subwoofer ar- ray module is tuned to complement RoomMatch full-range loudspeakers. As well as the the RoomMatch module, Bose also launched the PowerMatch am- plifiers - the PM8500 and PM8500N - the latter of which can be controlled and monitored over Ethernet. Both amps can allocate 4kW of power between two and eight channels; sound quality and reliability have not been forsaken for efficiency. Each amplifier includes Bose PeakBank power supply, which incorporates propri- etary regenerative four-quadrant design with fast-tracking Power Factor Correc- tion (PFC). It offers higher power and higher efficiency over standard PFC, and improves peak bursts for superior transient response and low-frequency perfor- mance. Bass transient response is further enhanced with Bose switching technol- ogy that delivers high levels of continuous output for longer durations. Through new QuadBridge technology, the PowerMatch amplifier provides a useful level of flexibility. It is configurable in single, bridge, or QuadBridge modes, and maintains consistent tonal balance regardless of the output level. Configurations are selected via software and include eight 500W, four 1kW, two 2kW, or mixed combinations. Bridge or QuadBridge modes can drive either low-impedance or 70V / 100V loads.
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