CIRCLE 1
Powered Sub-Woofer
The Circle 1 active sub-woofer is the perfect loudspeaker to complement the Circle 5 and Circle 3 in surround sound applications. Faithfully reproducing all the low frequency effects found in films and music, the HHB Circle 1 greatly improves the bandwidth of loudspeaker systems. With its built-in active crossover, any combination of up to five full-range loudspeakers, depending on the application, may be connected to the Circle 1, allowing its on-board filters to remove extreme low frequency content from the other signals, preventing their overload whilst attempting to reproduce these high energy frequencies. With this arrangement, no additional filtering is needed. Dedicated sub-woofer signals may be sent directly from a mixing console or multitrack recorder to the Circle 1 (5.1 mode), or the internal circuitry can extract the low frequency information from the left, centre and right input signals (B mode). In C mode, low frequency information is filtered from the left, centre and right input signals and added to the sub-woofer signal, ensuring optimum low frequency performance. The Circle 1’s paper pulp 12" LF driver is mounted at the top of the cabinet, displacing air out of the acoustically optimised front port.
CIRCLE 1
KEY FEATURES
•Designed for use as an integral part of any surround sound monitoring system
•Increases the bandwidth of a loudspeaker system down to 33Hz
•Exceptionally low colouration and distortion
•300mm (12") paper pulp bass/mid driver
•Low moving mass for fine transient response characteristics
•Air-cooled magnet system
•Very large voice coil and long throw suspension
•Flexible configuration possibilities, with direct input of sub-woofer signal (5.1 mode) or low frequency information extracted from the left, centre and right signal paths and fed internally (B mode) or summed (C mode) to the sub-woofer input within the Circle 1
•Balanced XLR and unbalanced RCA phono sub-woofer input
•Built-in 5-channel Sallen and Key active filters remove the need for external filtering
•Low noise, low distortion power supply with long life smoothing capacitors
•Variable phase control allows blending with existing speaker / room combinations
•Variable bass boost control achieves optimum bass balance across a range of differing listening levels (lower listening levels require bass boost according to psychoacoustic theory)
•Input sensitivity control allows matching of sound balance across the whole surround monitor system
•Built-in temperature overload sensor
•Rigid, ported cabinet, finished in durable black paint
•Distinctive purple grille