3.1 Introduction
Thank you for choosing MM Series power amplifiers
for your sound reinforcement system. We are confident
that you will be pleased with the performance,
configuration flexibility, reliability, and long-term
durability offered by the MM Series products.
This manual provides a comprehensive guide to the
features and functionality of MM Series amplifiers.
Please read through it to become fully acquainted
with the many configuration options and multiple
layers of protection circuitry. To facilitate timely
installation and use of this MM Series product, we
have included a Quick Guide Overview (section 5).
This brief summary, in conjunction with Installation
(section 4), contains the basic information needed
to safely install the amplifier and place it in service.
However, we highly recommend reading through this
manual in its entirety, beginning with Main Features
and Technologies and continuing through Operation
and Performance. As you become thoroughly familiar
with all aspects of operation, you may learn of features
or options that will affect your choices on amplifier
modes or loudspeaker system configuration.
3.2 Main Features
The MM Series incorporates a number of sophisticated
technologies - many of them proprietary to ensure the
best possible performance and many years of reliable
operation. Familiarizing yourself with these technologies
will prove invaluable in setting up and optimizing your
loudspeaker system.
3.2.1Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) feature allows
user adjustments that determine maximum voltage
output, thus matching the amplifier to the connected
Speaker load. Regardless of load impedance,
t h e V P L f e a t u r e c a n b e s e t t o e n s u r e t h a t .
Neither temperature nor current limitations are
exceeded before reaching the desired voltage
threshold.
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MM Series Operation Manual
3.2.2 Protection and performance
optimization
Appropriate and reliable power amplification is vital
to any audio system. Inadequate or faulty power
amplification could cause damage to the loudspeakers,
or in some cases to the power amplifiers themselves.
To prevent any damage or costly service interruptions,
MM Series amplifiers offer advanced features to
protect both internal circuits and any connected loads.
These features even protect the mains fuse that, in
extreme cases, could be overloaded.
Following are short descriptions of standard built-in
MM Series protection features:
CPL
, (Current Peak Limiter) ensures that the am-
plifier's output does not exceed the safe current
handling parameters of amplifier components.
Temperature protection
ensures that the
amplifier will not be damaged by exceeding
thermal limits.
PAL
, (Power Average Limiter) limits the maximum
average power consumption according to the
power supply and mains-breaker capabilities.
VHF
, (Very High Frequency) protection circuits
mute the output of the amplifier when non-
dynamic continuous signals above 10 kHz are
detected.
DC protection
ensures destructive DC signals
will not appear at the amplifier outputs. If such
conditions occur an internal fuse opens and fault
indication is displayed.
Low-impedance
(short circuit) protection pro-
vides a fault warning indication and shuts down
the output stage when, for example, an input
signal is present and a malfunctioning cable or
driver is short circuiting the output.
High-impedance
warning reports an alert when,
at the same time, output signal is high and no
current draw is measured. This situation might
occur when no speakers are connected, or when
a driver is blown.
Low inrush
current ensures that the mains
breaker will not trip when several power am-
plifiers are turned on simultaneously.
