Equipment Repair Form
Radio without CD
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Accessories For Sale
Bose Residential, Built-In Systems
102 EA II IDENTIFICATION
amplifier is manufactured in two
different versions, audio and video (surround sound). There are four
variations for audio and two for video. The four audio variations are,
Acoustimass Jewel Cube, Three Room System, and 102EA
II. The two video variations are
non-Jewel Cube and Jewel Cube.
To identify the unit's variation, check the
part number and description on the left
and right input terminal panels. The Jewel Cube versions of the
Acoustimass and video variations will state "Jewel" on the terminal
panels, i.e. BUILT-INvisible Jewel Home Theater. If it doesn't state
that it is a Jewel Cube version on the terminal panel, then it is the
non-Jewel Cube, or Acoustimass-5 cube speaker version.
102EA II System Identification: Part numbers for each variation are as follows:
Video Variation for home theater surround sound
(Jewel Cube and non-Jewel Cube): 172075
Acoustimass (Jewel Cube and non-Jewel Cube):
Three Room System: 175461-02
102EA II AUDIO SYSTEMS INFORMATION
Audio Systems Overview
102EA II, 3 Room and Acoustimass®
Amplifiers are completely
self-contained systems. They include all of the circuitry required to
accept line-level audio sources, to process signals as a two channel/two
room system, and to power a variety of Bose installed loudspeakers
through some or all of the six power amplifiers contained in the
systems. These are audio only systems, and do not process video surround
information. There are two video versions of the BUILT-INvisible
amplifier that include a Videostage®
decoder capable of processing video surround information and driving the
appropriate Bose loudspeakers for home theater use.
The BUILT-INvisible 102EA II, 3 Room and Acoustimass systems have three
stereo inputs, each with differential input circuitry to permit long
cable runs through the home while maintaining excellent noise immunity.
The inputs accept signals from Bose Lifestyle®
Music Centers as well as conventional
audio sources. The three stereo inputs connect to an automatic input
switcher. This switcher enables the amplifiers to function as three
source/two zone systems when used with multiple source components. You
can tailor the operation of the automatic input switching to each
customer's wishes by means of two preset terminals which allow the
installer to determine how the amplifier will behave when presented with
multiple sources. Rooms can be configured to switch to a new source when
it plays, or remain dedicated to a single source. A single source can
play in both rooms, or room 1 can play one source while room 2 plays a
When you install a system with the Bose CD-20 Music Center, the input
switching circuitry should be defeated using the preset terminals
located on the amplifier chassis. This allows full control of source
selection from the CD-20 remote control.
BUILT-INvisible Audio Systems at Turn-on
The system will come up in standby by default when AC mains power is
applied to it as long as none of the turn-on signals listed below are
applied. When the system is in standby, the following conditions are in
- The power amplifiers are off
- The DC voltages at the -8 Vdc and +8 Vdc terminals are active
- The Remote Turn-on terminals are enabled
- The Presets are enabled
- The audio signal inputs are enabled
- The automatic input switching circuitry is enabled
When the system is in standby, it is waiting to sense an audio signal at
one of its audio input terminals or a remote turn-on signal at one of
its remote turn-on terminals. This is the state of operation that the
system is normally in as installed when not in use. Once a turn-on
signal or an audio signal is applied to the appropriate terminal, then
the system will switch into the correct mode of operation as determined
by which terminal the input is applied to and how the presets are
configured. When the system is in operation, the power amplifiers are
enabled, and the system will produce audio at the correct locations.
HOME THEATER SYSTEMS INFORMATION
Video Systems Overview
home theater is a completely self
contained system. It contains all circuitry required to accept line
level audio sources, to process signals as a two channel, three speaker
music system or as a four channel, six speaker home theater, and to
power a variety of Bose installed loudspeakers.
Surround Processing Circuitry
The system incorporates Bose patented Videostage
surround processing circuitry. It is fully compatible with Dolby
Surround, Dolby Stereo and UltraStereo. Videostage steering logic was
specifically designed for the unique acoustical characteristics of a
home environment. Proprietary Bose processing also allows adjustment of
the width of the center channel for any screen size. This is not simply
the volume of the center channel, but the spatial extent of it as well.
You can create many different types of home theater systems using this
one chassis. Operating the various systems depends on which terminals
you use, which signals you connect, and how you connect them.
The system will come up in standby by default when AC
mains power is applied to it as long as none of the turn-on signals
listed below are applied. When the system is in standby, the following
conditions are in effect:
- The power amplifiers are off.
- Terminals 13 (-8 Vdc) and 15 (+8 Vdc) are active.
- Terminal 4 (home theater mode remote turn-on) is enabled.
- Terminal 12 (audio mode remote turn-on) is enabled.
- Terminals 6, 7, 17 and 18 (audio signal inputs) are enabled.
- Terminal 11 (home theater mode selector) is enabled.
When you power up the system from standby, the origin of
the turn-on signal determines which mode of operation it will enter.
The mode selection of the Home Theater chassis uses a
logic hierarchy. The system switches from standby or audio mode to home
theater mode immediately if there is a signal at any home theater
turn-on terminal, such as the following: - A 5 to 10 Vdc level at the
Remote Turn-on Home Theater terminal at block 4. - An active audio
signal at the Audio for Video Inputs at blocks 6 and 7. - A baseband
video signal (video, blue screen or snow) at the Home Theater selector
input at block 11.
The chassis will not switch back to audio mode until
there are no longer any home theater mode turn-on signals present. For
example, if the VCR is providing audio to the Left and Right Audio for
Video Inputs at blocks 6 and 7 when you put the audio source into play,
the system will not enter audio mode. It will not play the audio source
until you turn the VCR off. If you turned on the system in home theater
mode, you must remove whatever signal turned it on before you can revert
to audio mode.
home theater system is an audio system by default. It will play audio
until you tell it to operate as a home theater. For example, if a CD
changer is providing audio throughout the home and you connected its
signal to terminals 17 and 18, the system will operate in audio mode. If
any one of the three home theater mode turn-on signals listed above
becomes active, the system will switch to home theater mode. When the
system is in home theater mode: - The Left and Right Audio Inputs at
blocks 17 and 18 are deselected.
- The Left and Right Audio for Video Inputs at blocks 6
and 7 are selected.®
surround processor is enabled.
- The Videostage
- The chassis reads the voltage present at the Home Theater VCA Input
terminal at block 2 to set the volume level. The surround encoded stereo
audio signal connected to the audio for video inputs will decode into
left, right, center and surround signals. The signals are routed as
- Left and right front channels at blocks 24 and 23 play
through Bose Spatial ControlTM
cube or Jewel Cube®
- The center channel at block 21 plays through two Acoustimass-4 or
Jewel Cube arrays.
- The surround channel at block 19 plays through two 102®-SE,
or Model 32RS speakers.
- The Acoustimass bass module output at block 20 plays through one
Larger rooms may also use a second bass module at the
Acoustimass module #2 output at block 22.
The system is placed into audio mode by either of two
- A 5 to 10 Vdc level at the audio mode Remote Turn-on terminal at block
- An active audio signal at the Left and Right Audio Inputs at blocks 17
When the system is in audio mode:
- The signal connected to the Left and Right audio inputs at blocks 17
and 18 plays through an
Acoustimass module and a pair of Spatial Control
satellites or Acoustimass-5 cubes in two-channel stereo. Only the
speakers connected to the Right and Left Front Satellite terminals at
blocks 23 and 24 will play. The center channel and surround channel
speakers do not operate in audio mode.
- The Videostage surround processor is disabled.
- The chassis reads the volume control connected to the Audio Mode
Volume Control terminal at block 16 to set the volume.
A jumper from the Delay Disable terminal at block 3 to
Ground at block 1 defeats the four minute time delay incorporated
in the system. This time delay is to prevent the system switching from
home theater mode to audio mode until four minutes have elapsed. This is
to keep the system in home theater mode during the long audio silences
in some movies. Placing a jumper from block 3 to block 1 disables this
time delay, enabling instantaneous switching from home theater mode to
Automatic Turn-on Inhibit Switch
A short placed across these terminals at block 9 will
prevent the system from being turned on under any circumstances. This is
also referred to as a "vacation switch" and is used to allow the
amplifier to be turned off if the residence will be unoccupied for an
extended period of time.