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INTRODUCTION
Thank you for choosing LOUD Technologies’
Mackie active sound reinforcement speakers.
The SRM350 is an active two-way loud-
speaker capable of extremely high sound
pressure levels, and designed to give you the
best performance of any loudspeaker in its
class and price range.
When we designed the SRM350s older
sibling, the SRM450, our goal was to build
a sound reinforcement speaker with the
same fidelity and precision found in our re-
knowned HR824 studio monitors.
Apparently, people liked what they heard.
Now, our goal for the SRM350 is to make
the sound even better with improved active
electronics, but delivered in a more compact
size. We think you’ll agree that the SRM350
sound quality and accuracy reaches this
goal and more. The result is a compact
sound reinforcement system equally at
home in a concert setting, in the studio, im-
promptu concerts on the studio roof, in the
cinema, or in a home theater.
The Transducers
The SRM350 active speakers feature a 10˝
high-power low-frequency woofer and a 1.4˝
titanium diaphragm high-output precision
compression driver. This high- frequency
driver is mounted on an acoustically non-
resonant exponential waveguide, providing
a wide, controlled dispersion and precise re-
production of the critical upper mid-range
and high frequencies. The result is an unbe-
lievably smooth off-axis response that
allows everyone in the audience to experi-
ence the same high-resolution audio no
matter where they are seated.
Each driver has been specifically designed
by our engineers for optimum performance
in the lightweight high-strength cabinet.
Power Amplifiers
To power these beautiful things, each
SRM350 includes two power amplifiers.
They include the following features:
• The low-frequency amplifier produces
165 continuous watts before clipping.
• The high-frequency amplifier produces
30 continuous watts before clipping.
• Both amplifiers are a Class H design,
which uses a dual power supply for
improved power and thermal efficiency.
The amplifiers operate on the lower
voltage rails until the signal requires
more power, at which point the high
voltage rails seamlessly kick in to
provide additional power.
• An Active Protection Management
System monitors the output levels from
both amplifiers as well as the operating
temperature of the amplifiers. When the
output from either amplifier begins to
clip, a limiter gently reduces the input
signal level until the output is no longer
clipping. Likewise, if the temperature of
either of the amplifers begins to exceed
a safe operating level, the input signal is
elegantly adjusted to keep the tempera-
ture at a desired operating level.
• The low-frequency amplifier also has a
Dynamic Bass Boost circuit. Our ears
are more sensitive to bass frequencies at
high volume levels than at softer vol-
umes. This unique circuit automatically
reduces the low frequencies below 70
Hz as the volume of the speakers goes
up. This results in improved efficiency
for the low-frequency amplifier because
it is not wasting power trying to repro-
duce frequencies we hear better at loud
volumes. Instead, the power is used for
the frequencies where it is needed,
resulting in a louder sound.
Warning: Although the
amplifiers have these
protection circuits, you
must still make sure the
LIMIT light is not blink-
ing continuously. If it is, turn down your
mixer faders, or preamplifier gain, or turn
down the SRM350 LEVEL control.