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Electronics Panel Picture
7.1 High Definition Bass Manager™ Electronics Panel (O 810 shown)
Crossover
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Using 4
order filters, the crossover divides each input signal into two bands for reproduction by the subwoofer
or the main loudspeakers. The crossover frequency is fixed at 80 Hz for all the main channels and can be
bypassed when required. This frequency was chosen to balance the conflicting requirements of having a high
crossover frequency to relieve the main loudspeakers of their low frequency duties thereby reducing distortion,
and of the need to have a low crossover frequency to minimize the chances of localizing the subwoofer thereby
giving greater flexibility when placing the subwoofer in the room. In addition by choosing 80 Hz, there is a
compatibility with the replay conditions commonly found in the home.
The gain for all main channels passing though the subwoofer is 0 dB unless some attenuation has been applied
by the volume control function. The LFE channel is processed independently (see the Filter Card...LFE Mode
section for details). In addition to this an extensive protection system ensures that the loudspeaker is not
damaged if a large signal is applied to the input. The Power On light on the electronics panel flashes when the
protection system is active. If this happens, reduce the input signal level. If this happens regularly, use a larger
subwoofer with a higher SPL output or add more subwoofers to the system to increase the LF headroom.
The protection system consists of: thermal and peak limiters for the amplifier(s), thermal modeling of the
driver(s), and an excursion limiter for the driver(s). The protection system is not a compressor, it is designed to
protect the subwoofer from damage, and the flashing light tells the user it is active. The protection system
cannot protect against sustained abuse of the loudspeaker, i.e. consistently playing the loudspeaker for long
periods of time with the protect light on, so avoid this to ensure a long life from this product.
Operating Manual O 810 / O 870
All manuals and user guides at all-guides.com
English
Klein + Hummel
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