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4
INTRODUCTION
Thank you for choosing a Mackie compact active PA
system for your sound reinforcement applications.
The SRM150 is an active PA system that provides a
built-in mixer, high sound pressure levels, and is de-
signed to give you the best performance of any compact
PA system in its class and price range.
Our design goal was to build a compact PA system with:
1. High precision, high output, and accurate playback.
2. Controlled, smooth dispersion of mid and high
frequencies.
3. Ultra-clean, high-headroom mic preamps.
4. High-output Class-D amplification.
5. Onboard Mackie mixer with 3-band EQ.
Through the combined resources of our top-notch me-
chanical and analog engineers, we were able to achieve
our design goals in every aspect. The result is a sound re-
inforcement PA system equally at home in a concert setting,
in the studio, or impromptu concerts on the studio roof.
The Transducer
The SRM150 active loudspeaker features a full-range
5.25-inch neodymium driver.
Power Amplier
Each SRM150 includes a Class-D power amplifier
capable of producing 150 watts peak before clipping.
The amplifier includes the following features:
• The amplier produces up to 100 watts rms continuous
before clipping (150 watts peak).
• A built-in limiter acts when the input signal is large
enough to cause clipping, distortion, and excessive
voice coil heat. The limiter will automatically decrease
the signal going to the amplifier to a safe level.
Warning: Although the amplifier has
a limiter protection circuit, you must
still make sure you don’t overdrive
the amplifier. If you hear any distor-
tion, turn down the input (MIC/LINE)
gain control, or turn down the MAIN
LEVEL control.
The Cabinet
The SRM150 cabinet was designed with the same
material as our SRM350 and SRM450 loudspeakers, the
strongest molded composite cabinet on the planet. It
has an insert in the bottom for mic stand mounting (us-
ing the mic stand adapter included with your SRM150),
and a threaded insert in the top for mounting a micro-
phone boom (using the included boom extender).
Its light weight and durable finish make it ideal for
portable sound system use. In addition, the unique de-
sign of the cabinet makes it easy to use as a floor wedge
for stage monitor applications.
The Active Advantage
There are a number of advantages to using an active
speaker system over a passive loudspeaker:
• The ampliers are designed specically for the speaker
load impedance. There is no guesswork as to what load
the amplifier has to drive, so it can provide maximum
acoustic output from the speaker, yet minimize the
danger of speaker damage due to overdriving a lesser
amplifier.
• The connecting wires between the amplier output and
the driver is kept to a minimum, so the damping factor
of the amplifier isn’t compromised by the resistance of
long speaker cables. In addition, all the power from the
amplifier is transferred directly to the driver with no
speaker cable losses.
• The presence of active circuits within the speaker
cabinet allow the designer to add on extra details, such
as a high quality mic/line input section.
In short, all the complex interconnected components
in the system are designed to work in harmony with
each other to produce the best possible sound.
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