Mackie Thump 15 Owner's Manual download pdf (Page 10)

• Iftheinternaltemperatureagaingetstoohot,

the shutdown process repeats. Should this

  happen,makesurethatairowtotherearofthe

cabinet is not restricted. If the ambient air

temperature is very warm, try pointing a small

  fantowardtherearpaneltoincreasetheairow

through the ﬁns.

Driver Protection

Each driver has its own compression circuit, which

helps protect them from damaging transient peaks. The

compressors are designed to be transparent and are not

noticeable under normal operating conditions.

Input Signal Wiring

You should use high-quality, shielded cable to

connect the signal source to the INPUT jack on the

TH-15A.

• Highqualitymicrophonecablesworkwell.

• Foilshieldedcablesarecommonlyusedforaudio

wiring.

• Thebettertheshield,thebettertheimmunity

from externally induced noise (like EMI and

RFI). Route the cable away from AC power cords

and outlets. These are common sources for hum

in an audio signal. You can purchase quality

cables from your Mackie dealer.

Placement

The TH-15A loudspeaker is designed to sit on the

oororstage.Itcanbepole-mountedviathebuilt-in

socket on the bottom of the cabinet. Be sure the pole is

capable of supporting the weight of the TH-15A.

WARNING: The cabinet has no rigging

points and is not suitable for rigging.

NEVER attempt to suspend the TH-15A by

its handles.

As with any powered components, protect them from

moisture. If you are setting them up outdoors, make

sure they are under cover if you expect rain.

Protection Circuits

There are several protection mechanisms designed

into the TH-15A to safeguard the loudspeakers and

ampliﬁers from inadvertent damage.

CAUTION: The protection circuits are

designed to protect the loudspeakers under

reasonable and sensible conditions. Should

you choose to ignore the warning signs

(i.e., frequent OL LED indications, excessive distortion),

you can still damage the speakers in the TH-15A by

overdriving them past the point of ampliﬁer clipping. Such

damage is beyond the scope of the warranty.

Overexcursion Protection

A 12 dB/octave high-pass ﬁlter at 40 Hz just prior

to the low-frequency ampliﬁer prevents very low

frequencies from being ampliﬁed. Excessive low-

frequency energy below 40 Hz can damage the woofer by

causing it to “bottom out,” also known as overexcursion,

which is equivalent to a mechanical form of clipping.

Thermal Protection

All ampliﬁers produce heat. The TH-15A is designed

to be efﬁcient both electrically and thermally.

The ampliﬁer module is mounted on a large

heatsink, which is cooled by convection where cool air

is drawn over the rear panel, carrying the heat away.

In order for this convection cooling to work efﬁciently,

it is important to provide adequate airspace behind

the loudspeaker. When you position the TH-15A, we

recommend leaving at least six inches of air space

behind it.

• Ifforsomereasontheinternaltemperature 

gets too hot, a built-in thermal switch activates

and turns off the ampliﬁer. This protection

operates independently for the low-frequency and

high-frequency ampliﬁers. Therefore, it is possible

for only the low frequency or high frequency

ampliﬁer to shut down while the other remains on.

• Whentheampliercoolsdowntoasafe 

temperature, the thermal switch resets

and normal operation resumes.

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Mackie Thump 15 Owner's Manual Page 10

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