Normal System Operation Description - Bose Loewe Concertos Acoustimass 61247 Service Manual

Normal System Operation Description

Basic System Operation
Series II system uses digital signal processing to bring even greater realism and
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impact to both movies and music recordings. Built-in Dolby Digital (AC-3) decoding delivers up to
5.1 discrete audio channels (i.e., five for the independent Satellite Speakers and one for rich bass
from the Acoustimass
receivers. With analog formats, as well as for two-channel PCM and Dolby Digital bitstreams,
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Videostage decoding directs stereo information to the surround channels, so the sound of stereo
broadcasts and rented or recorded tapes can approach that of your DVD discs.
In addition, Videostage decoding processes a one-channel program and directs five-channel
sound to five independent speakers. Dialogue remains locked on-screen, while music and ambient
effects fill the room to increase the listening enjoyment.
Series II systems offers the option of listening in 5, 3 or 2-speaker mode.
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The system turns on in Surround (5-speaker) mode. For most video material (mono, stereo, or
surround), listening in 5 or 3-speaker mode helps anchor the dialogue to the picture while
providing a fuller sound.
Enhanced Mode for Movie Soundtracks (Film EQ)
Pressing the VIDEO 1, VIDEO 2, or AUX turns the system on in enhanced mode, with bass and
treble settings specially designed for proper playback of movie soundtracks. Press the same
button (VIDEO 1, VIDEO 2, or AUX) again to alternate between enhanced mode for movies and
standard mode for other listening. Pressing TAPE turns the system on in standard mode.
Press TAPE again to alternate between enhanced mode for movies and standard mode for
other listening.
Note: Enhanced mode provides more bass and treble, as is specified for proper playback of movie
sound.
Dynamic Range Compression
Dynamic Range compression automatically adjusts the volume to allow you to hear soft sounds
(particularly dialogue) and to prevent you from being overwhelmed by a loud special effect (i.e., an
explosion). This feature is engaged when you turn on the system, but you may turn it on (one
chime) or off (two chimes) (see explanation table on the next page) using the STEREO two-
speaker button.
Simulated Surround for Mono Movie Material
Bose ® Videostage decoding can process a one-channel program into five-speaker sound directing
the signals so that dialogue remains locked on-screen, while music and ambient effects fill the
room. You experience a surround sensation, providing extra enjoyment when you watch older (i.e.,
pre-stereo) movies. This feature can be used for mono TV, FM, and AM programs. Press the
SURROUND (5-speaker) button to turn it on (one chime) or off (two chimes). This feature is
automatically engaged when a Dolby Digital bitstream indicates that it contains a mono program.
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module) from DVD, digital TV, next-generation cable boxes, and satellite
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