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.

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.

Manual Owner’s

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.

Owner’s Manual

13