13
Owner’s Manual
Owner’
s Manual
Thermal Protect
All amplifiers produce heat. The HR624 MK2 is
designed to be efficient both electrically and thermally.
• If for some reason the heatsinks get too hot, a thermal
switch activates, placing the HR624 MK2 into Standby
mode (indicated when the power ring [10] turns off).
• Should this happen, make sure that airflow to the rear
of the cabinet is not restricted.
• When the heatsinks cool down to a safe temperature,
the switch resets and normal operation resumes.
Integrated Magnetic Shielding
The HR624 MK2 Studio Monitor contains drivers
with large magnet structures. The drivers’ magnets are
shielded to help prevent the magnetic field from
radiating out into the environment and playing havoc
with computer monitors or TV screens. 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.
Input Signal Wiring
You should use high-quality, shielded cable to connect
the signal source to the SIGNAL INPUT jack [1] on the
HR624 MK2.
• Foil shielded cables, such as Belden 8451, 8761, or 9501
are commonly used for studio wiring.
• Microphone cables work well.
• 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. Wall warts
and line lumps are especially insidious hum inducers!
You can purchase quality cables from your Mackie
dealer.
• In certain home theater applications, it may be
necessary to connect the speaker outputs from a stereo
receiver to the inputs of the HR624 MK2s, 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 HR624 MK2!
Speaker levels are much higher than
line levels and can damage the input
circuitry in the HR624 MK2.
You can, however, insert a speaker-level to line-level
signal attenuator between the receiver’s speaker output
and the HR624 MK2’s input. Your Mackie dealer may be
able to help you find one, or you can build your own.
CARE AND CLEANING
Remove the protective plastic film that encases the
cabinet.
Note:
You may leave the protective
plastic film on the cabinet if you
wish, or you can remove all but the
side that will be in contact with the
surface it is sitting on to protect the
finish. Also, you should save the protective plastic film
to reapply to the cabinet in case you need to move it to
another location (or return for servicing).
The piano-black finish on the HR624 MK2 cabinets is
exceedingly beautiful, yet extremely delicate. Clean the
outside of the cabinet with an optical grade non-scratch
cloth, such as you would use to clean eyeglasses, CDs, or
DVDs.
