Mackie MR5mk3 Owner's Manual download pdf (Page 8)

MR5mk3 / MR6mk3 / MR8mk3

Protection Circuits

Input Signal Wiring

We recommend using high-quality, shielded cables

to connect the signal source to the signal input jack [3]

on MRmk3 studio monitors.

Three types of input connectors are provided to

interface with virtually any application you may have:

• Balanced microphone cables work well with the

XLR input.

• Balanced TRS cables work well with the 1/4" input.

• Unbalanced phono cables work well with the RCA

input.

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 MRmk3 studio

monitors 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

MRmk3 studio monitor! Speaker levels are

much higher than line levels and can damage the input

circuitry in the MRmk3 studio monitors.

However, it is possible to insert a speaker-level to

line-level signal attenuator between the receiver’s

speaker output and the MRmk3 studio monitor’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 11.

Care and Cleaning

MRmk3

Reference Studio Monitors will provide many

years of reliable service if you follow these guidelines.

• Avoid exposing the monitors 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.

There are several protection mechanisms designed

into the MRmk3 studio monitors 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 speakers in the MRmk3 studio monitors by

overdriving them. Such damage is beyond the scope

of the warranty.

Overexcursion Protection

A 12 dB/octave high-pass ﬁlter below port tuning

just prior to the low-frequency ampliﬁer prevents

very low frequencies from being ampliﬁed. Excessive

low-frequency energy below the usable frequency range

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 MRmk3 studio

monitors are 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.

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 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

The MRmk3 studio monitors 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.

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Mackie MR5mk3 Owner's Manual Page 8

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