Mackie THUMP210XT - Chapter 3: Protection Circuitry; Introduction; Limiting; Overexcursion Protection

THUMP210XT 10" 1400W ENHANCED COMPACT POWERED LOUDSPEAKER
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Chapter 3 : Protection Circuitry
Introduction
ThumpXT loudspeakers employ a built-in limiter for less distortion at peak levels. A dynamic bass response circuit provides
optimal low frequency response regardless of overall output level. Additional protection includes automatic thermal shutdown
should the amp overheat. However, with Class-D amp technology, which is highly-ecient, this should never be a problem.
The protection circuits are designed to protect the loudspeakers under reasonable and sensible conditions.
Should you choose to ignore the warning signs [e.g. excessive distortion], you can still damage the woofer
in the loudspeaker by overdriving it past the point of amplifier clipping. Such damage is beyond the scope
of the warranty.
Limiting
Let’s take a peek under the hood at the polymer compression driver. Compared to other available drivers, these provide
a substantially smoother high-frequency response which results in a studio monitor level of accuracy and clarity.
Furthermore, these drivers oer an insanely smooth transient response behavior. Yes, we, too, are fans of our own products!
Continuing on, the driver has its own compression circuit which helps protect it from damaging transient peaks.
The compressor is designed to be transparent and is not noticeable under normal operating conditions.
Overexcursion Protection
A subsonic filter circuit just prior to the power amplifier prevents ultra-low frequencies from being amplified.
Excessive low-frequency energy can damage the woofer by causing it to “bottom out,” also know as overexcursion,
which is equivalent to a mechanical form of clipping.
Thermal Protection
All amplifiers produce heat. ThumpXT loudspeakers are designed to be ecient both electrically and thermally.
In the unlikely event of the amplifier overheating, a built-in thermal switch will activate, muting the signal.
When the amplifier has cooled down to a safe operating temperature, the thermal switch resets itself,
and the ThumpXT loudspeaker resumes normal operation.
If the thermal switch activates, try turning down the level control a notch or two on the mixing console to avoid overheating
the amplifier. Be aware that direct sunlight and/or hot stage lights may be the culprit of an amplifier overheating.