CAMBRIDGE QT Spécifications télécharger pdf (Page 9)

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Setting the masking volumes can be approached in

two ways:

IDEAL: If a sound level meter is available, adjust

the unit’s masking volumes to achieve the following

readings on a sound level meter.

Sound Level Meter Readings

Open Areas Zones:

45 – 48 dBA, measured three (3) feet above ﬂoor level

Private Ofﬁce Zones:

38 – 42 dBA, averaged spatially within the ofﬁce

OTHERWISE: If a sound level meter is not available,

the proper levels are likely to be achieved in most

environments by setting the unit’s masking volumes

as follows:

Qt PRO™ Masking Volume Settings

Open Area Zones:

Volume level 13 – 16, for 8' ceilings

Volume level 15 – 18, for 10' ceilings

Volume level 17 – 20, for 12' ceilings

Private Ofﬁce Zones:

Volume level 05 – 09 (or higher), for all ceiling

heights

Masking volumes must be set sufﬁciently high to

improve speech privacy and reduce distractions,

but not so high that the masking sound becomes

objectionable. Settings within the above ranges should

accommodate both objectives. As a general rule, set

masking volumes toward the high end of the range,

but base ﬁnal settings on site conditions and customer

preferences. It is highly recommended that the system

be turned on when the space is unoccupied to avoid

drawing attention to the masking sound. If a space is

occupied, the volume may be ramped over time. To

do this, refer to “Volume Ramping” on page 10.

Paging Volume Adjustment

• If paging is to be supported, adjust paging sensitiv-

ity

and paging volume. Qt PRO™ provides two paging

inputs, each of which is connected to all zones. You

must adjust paging sensitivity for each paging input

signal and paging volume for each paging output to

each zone.

Paging sensitivity is used to gain (±) the incoming

paging signal to match the range of Qt PRO™’s

circuitry. It is adjusted for each paging input. Once

adjusted, volumes are set for each zone by adjusting

the zone’s paging (A and/or B) volumes.

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CAMBRIDGE QT Spécifications Page 9

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