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BX30 Owner’s Manual
11
5.1 Systems
Dolby AC3 format.
The specification for each channel is strictly defined and the
BX30
conforms carefully and accurately to that standard.
The agreed sound level capability for the sub bass channel in film theatres is 115 dB in any one-octave band, in any
seat. The
BX30
can deliver this output with clean, undistorted power, which is equally suited to small rooms, or in
multiple (modular) formats in much larger spaces. Our design chart gives SPL predictions for different rooms. Please
note these are narrow band or single frequency predictions, not broad band levels which are much higher.
For example a single
BX30
will produce 112 dB at 63 Hz at one metre, enough to match nearly all near-field monitors,
while eight units can satisfy the requirement for THX theatres of 1000 cubic metres at a distance of 10 metres.
By comparison the Dolby requirement for calibrated 5.1 systems is only 105 dB and so the
BX30
is well equipped to
deal with the future demands of digital multi channel audio, especially in the professional dubbing theatre.