IVIE MPS 2300, User Manual

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Basic
Instructions
lvie Technologies
MPS 2300
Music Adjustments.
Set the 0.1 V-l V Sensitivity Switch so the Music Gain
control operates in a comfortable range (see Gain Staging,
below). The Treble and Bass controls are flat on the center
detent and have typical home-stereo response curves to
match tone quality for each source.
Aux Inputs.
Gain Staging.
Control Range.
Gain Staging
Adjustments.
Gain Staging the
Paging Levels.
An unbalanced barrier-strip input with Gain control for each
Zone bypasses all front controls except the Master controls
for each Zone’s power amp. Useful for alarm messages,
chimes, masking or outboard mixes which should not be
affected by Music or Paging.
There are two general approaches to setting the controls on
the front panel. One is to set the Music Volume and Paging
Volumes to control the relative loudness of the music and
paging, and let the user adjust the Master Volume for each
zone. The other is to pre-set the Master Volumes for each
zone and let the user adjust the Music and Paging
separately. Pre-set controls can be locked out and "site-
specific” labels used to clearly identify the remaining
controls. The installer’s goal is to pre-set the rear panel and
locked-out front panel controls so that the remaining
controls operate over a well-controlled range, with the
center detent being “nominal”. Since there are three
controls affecting the gain of any signal (two front-panel,
and one rear-panel control), it is essential to adopt an
organized approach to Gain Staging.
Front-panel Volume controls are -6 dB on the center
detent providing limited “boost” above
and
unlimited
volume reduction below the detent.
Determine which controls will be user-adjustable, and
set these on the center detent. Adjust the remaining
front
and back panel controls to obtain the desired
levels. Start by establishing the paging level, as noted
below.
The peak level of the paging signal is controlled by
the AGC circuit and can serve as an anchor around
which to set the other levels. The AGC circuitry is
designed so that the threshold of power amp clipping
is reached when Paging Volume and Master Volume
are full-up for a given Zone. For “normal” full power
paging with a few dB of headroom,
either the Master Volume or the