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Mackie SRM150 [4/20] Introduction

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 Amplier

Each SRM150 includes a Class-D power ampliﬁer

capable of producing 150 watts peak before clipping.

The ampliﬁer includes the following features:

• The amplier 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 ampliers are designed specically 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 amplier 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.

Mackie SRM150 [4/20] Introduction

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