Altec Lansing ADA890 User Manual page 5

Placement of Speakers (See Figures 5 and 6)
All stereo information is heard from the satellite and surround speakers. The subwoofer contains no stereo information and its sound is non-directional. As a result,
the subwoofer does not necessarily have to be placed in any particular relationship to the satellites. Placing the subwoofer on the floor close to a wall or corner of a
room provides maximum bass efficiency. The subwoofer is not magnetically shielded and should not be placed near video displays. *
Near Field (3 Piece)
The satellite speakers are magnetically shielded and can
be placed close to the computer monitor without
distorting video images. Best stereo effects are obtained
by placing the speakers as far apart as is practical.
Enhanced Surround Sound (5 Piece)
Best surround effects are obtained by placing the rear
surround speakers slightly behind the user and
approximately the same distance apart as the front
satellite speakers. Excellent results are obtained when the
surround speakers are in line with, and slightly above the
listener's ears.
*Note: Care should be taken not to place diskettes or
other magnetic media on the subwoofer.
Using the Speaker System (See Figure 7)
POWER. Press this button to turn power on. The LCD display will illuminate and show the last mode of operation. Press again to turn power off.
MODE SWITCH. Pressing this switch repeatedly will access several modes of operation. Each time the MODE switch is pressed the LCD display will show which
mode is selected. The various modes of operation are described below.
STEREO. In this mode information obtained from the FRONT and S/PDIF** inputs is used. The front information is decoded to stereo. The S/PDIF information
may be PCM*** or Dolby Digital. The automatic decode circuit will process either one. If PCM is sensed it will decode to stereo. If Dolby Digital is detected all
channels will be mixed to provide stereo information. In this stereo mode sound will only be heard from the left and right front speakers and subwoofer. The center
channel and surround speaker will not be operational in this mode.
STEREO X 2. In this mode the operation is the same as for the STEREO mode. The exception is that the two surround speakers will be activated. The front left and
surround left speakers will be one stereo channel and the front right and surround right will be the other channel. The level of the surround speakers can be adjusted
separately. See SURROUND mode operation to make this adjustment. Advantages of operating in this mode are that the stereo effect can be enhanced and overall
audio is increased by the use of two additional amplified speakers. The center channel is not operational in this mode.
PRO LOGIC. In this mode only information obtained from the front analog input are used. All five speakers will be activated. The front left/right speakers will
provide stereo and center information and the surround speakers will provide surround information. No digital inputs (S/PDIF) will be processed in this mode.
**S/PDIF - Sony/Philips Digital Interconnect Format
***PCM - Pulse Code Modulation
Figure 7
QUAD. In this mode separate inputs are used for the FRONT and SURROUND channel sets (Refer to Figure 2). The front channel set input is the LIME input. The
surround channel set input is the BLACK input. The front information is decoded to stereo and feeds the front left/right speakers and the subwoofer. The surround
information provides the surround channel and also is sent to the subwoofer. All five speakers are operational in the QUAD mode.
DOLBY DIGITAL. In this mode only information obtained from the FRONT and S/PDIF inputs is used. The front information is decoded to stereo and subwoofer.
The S/PDIF information may be Dolby Digital or PCM. The automatic decode circuit will process either one. If PCM is sensed, it will be decoded to Prologic. If
Dolby Digital is sensed it, will be decoded to Dolby Digital and the front information will be reduced to a lower level. All five speakers are operational in this
mode. This mode reproduces analog and digital simultaneously.
Note: If your computer has a separate sound card with an S/PDIF output, you may use this output to feed the S/PDIF input with the front channel information. Refer
to your system documentation for its output information
Figure 5
5
Figure 6
1) Recessed LCD Display
2) Volume Level and Mode Indicators
3) Recessed Infra Red Detector for Remote Control Use
4) On/Off
5) Push Buttons, Mode, Bass and Treble
6) Master Volume Control