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Protection Circuits
There are several protection mechanisms designed
into the MR10Smk3 studio subwoofers to safeguard the
speakers and amplifiers from inadvertent damage.
CAUTION: The protection circuits
are designed to prevent damage to the
speakers under reasonable and sensible
conditions. Should you choose to ignore the warning
signs (i.e., excessive distortion), you can still damage
the speaker in the MR10Smk3 studio subwoofer by
overdriving it. Such damage is beyond the scope
of the warranty.
Overexcursion Protection
A 12 dB/octave high-pass filter just prior to the
low-frequency amplifier prevents very low frequencies
from being amplified. Excessive low-frequency energy
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 MR10Smk3 studio
subwoofer is designed to be efficient both electrically
and thermally.
• If for some reason the heatsink gets too hot, a thermal
switch activates and turns off the amplifier.
• When the heatsink cools down to a safe temperature,
the thermal switch resets and normal operation
resumes.
• If the heatsink temperature again gets too hot, the
shutdown process repeats. Should this happen, make
sure that airflow to the rear of the cabinet is not
restricted.
Integrated Magnetic Shielding
MR10Smk3 studio subwoofers contain drivers with
large magnetic structures. The drivers' magnets are
not shielded. Unshielded speakers can cause distortion
in both the shape and color of the picture if placed
too close to a CRT (cathode ray tube). If you have
a particularly sensitive computer monitor or TV
screen, it may be necessary to move the speakers
a few inches away.
8
MR10Smk3
Input Signal Wiring
We recommend using high-quality, shielded
cables to connect the signal source to the signal
input jacks [4] on MR10Smk3 studio subwoofers.
Two types of input connectors are provided to
interface with virtually any application you may have:
• Balanced microphone cables work well with the
XLR inputs.
• Balanced TRS cables work well with the 1/4" inputs.
NOTE: Route the cable away from AC power cords
and outlets. These are common sources for hum in an
audio signal. Wall warts and line lumps are especially
insidious hum inducers!
NOTE: In certain home theater applications, it may
be necessary to connect the speaker outputs from a
stereo receiver to the inputs of the MR10Smk3 studio
subwoofer if the receiver doesn't have preamp outputs
or other line-level output connections.
CAUTION: Do not attempt to connect a
speaker output directly to the input of the
MR10Smk3 studio subwoofer! Speaker levels
are much higher than line levels and can damage the
input circuitry in the MR10Smk3 studio subwoofer.
However, it is possible to insert a speaker-level
to line-level signal attenuator between the receiver's
speaker output and the MR10Smk3 studio subwoofer's
input. Any local authorized dealer should be able to
assist, or you can build your own.
More information (with illustrations!) may be found
in Appendix B on page 12.
Care and Cleaning
MR10Smk3 Reference Studio Subwoofers will
provide many years of reliable service if you follow
these guidelines.
• Avoid exposing the subwoofers to moisture.
• Avoid exposure to extreme cold (below freezing
temperatures).
• Use a dry cloth to clean the cabinets. Only do
this when the power is turned off.
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