MRC EQ Limit, Руководство пользователя

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MRC AUDIO EQ
Limit
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Thank you for using the Limiter-Controller
MRC AUDIO EQ Limit , the most complete system
for controlling the sound emission in public leisure establishments. This equipment adjusts the
sound emission in a musical system, acting softly on the audio signal what warranties that the
sound level inside the house does not exceed the maximum, avoiding in this way infringing the
corresponding local rules, and ensures a perfect coexistence with possibly affected
neighbours.
Specific and calibrated microphones are used in this equipment to detect the sound pressure
level. The generated signal is weighted as for “C”, “A” or “BASS” curves and is registered
periodically with programmable frequency and registering all sound parameters: Leq5s, LeqT
prog, L10, L90. These parameters can be measured also through a second sensing
microphone. The in&out audio signals is also registered for a combined evaluation.
This signal is compared to the levels and timetables adjusted during the programming of the
unit. As the maximum sound level is exceeded the equipment starts limiting. Beyond this point
and even if the input signal grows, the sound level in the house won’t grow over the level fixed
as the limit. The limiter’s action is shown by a group of LEDs marked with 5, 10, 15, 20, 30 and
40dB of attenuation. Although the limiter does not show further, it will still carry on limiting up
to over 60dB. The input overload is signalled by the AUDIO LED on the front and on the remote
display. It is also possible to use the audio signal as the limiting source instead of the signal
measured by the microphone. In both cases it is possible to adapt the limiting spectral curve
to the house’s isolation spectral curve by means of a spectral meter with 12 1/3 octave filters.
The limiting circuitry is one of the important advantages of this equipment, because it calculates
in a predictive manner, the possible boost of sound level and thanks to its elaborated design
avoids the unpleasant pumping effect and/or breathing sound other limiters have, offering high
quality sound even at high attenuation levels.
Also, it reminds the last attenuation level when the input audio signal is interrupted, avoiding,
in this manner, high level sound peaks when the signal is back on.
The control circuit is based on a powerful microprocessor that permits measuring both
microphones, input line, output line and the 12 1/3 octave filters in real time. It also registers,
and shows on screen all the events, including alarms, that might arise, together with their date,
time, and sound levels in dB, per each.

It regulates all the work time with three different working maximum levels per each day of
the week. In this way, it is possible to have different maximum permitted sound levels
depending on the hour of the day or depending on the day of the week; or alternatively it
is possible to have the same maximum permitted level all the time.

It changes automatically from winter to summer time.

It has the possibility to program up to ten special periods between any two-year days, in
which levels and/or timetables may be altered, intended for special occasions.

It registers the date of the programming changes, as it also registers the user’s license of
the technician that makes those changes.

Sound levels are registered periodically during the working sessions.
INTRODUCTION
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