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3.0 System Setup

3.6 Dual zone, single source system

The FreeSpace

6 business music system can be used to create a two-zone single source installation using the same

monaural music source. Each zone can have different loudness levels and a choice of page overrides. There is no

provision for independent page sources for the two zones—there is only one page input on the system electronics.

3.6.1 L zone trim (block 13)

This trim adjusts the level of the "left" zone relative to the "right" zone in mono installations, where one group of

loudspeakers on the left amplifier output must be adjusted in level relative to a second group of loudspeakers on the

right amplifier output. The control has a range of 0dB to –6dB. Use the R loudspeaker outputs to drive the zone that

is supposed to be the louder of the two, and use the L loudspeaker outputs for the quieter zone.

3.7 Page enable (block 5)

Page Enable switches can be used to determine which, if either, zone receives paging.

One special issue attaches to the use of the Page Enable switches in this two-zone case. The phase of the loud-

speaker output is inverted when paging is enabled (180˚ phase reversal). If one zone has paging enabled and the

other zone has paging disabled, the loudspeakers in the L zone will be out of phase with the loudspeakers in the R

zone. Since the whole point of using the two zones is to provide a differentiated set of zone signals, there will usually

be enough separation between zones so that there is no overlap region where acoustic energy from both zones is

present. If, however, there is an overlap zone, sensitive listeners may sense "something funny" from the sound,

especially as they move around in the overlap region. There could also be a perception that the bass is diminished in

this region.

Avoid an overlap zone if using a FreeSpace business music system in this way.

3.8 Loudspeaker equalization switch and the bass and treble con-

trols (block 12)

The loudspeaker equalization switch is used to select the proper equalization for the loudspeaker type you have

installed. Selecting the incorrect equalization will produce undesireable results.

The bass and treble controls may be used to make a final "touch-up" of the frequency response in the installation.

These controls have a range of about 6dB maximum, and will generally be left flat (turned to their center position).

Bose

engineers have carefully adjusted fixed and dynamic equalization in the system electronics amplifier to yield an

acoustically correct frequency response. However, some environments with many cloth wall hangings might benefit

from a slight treble boost.

AM180090_02_V.pdf • May 7, 2002