Many “authorities” tell you that shields should only be connected at one end. Some- times this can be true, but for most (99%) audio systems, it is unnecessary. If you do every- thing else correctly, you should be able to connect every component of your audio system using standard,
Here are some guidelines:
1.All return lines to the stage should be balanced. At a minimum, they should be impedance balanced. Remember that you can balance a line by inserting a piece of equip- ment inline that has a balanced output.
2.Run your own AC power wiring from the stage for the mixer and related equipment. Don’t use the “conveniently located” recep- tacle thoughtfully provided by the management for your use. You have no idea how it’s wired or grounded.
3.Carry an outlet tester, available at any well- stocked hardware store. Use it to tell you if the outlet you’re about to plug into is wired correctly. Consider it cheap insurance.
4.If you carry enough equipment that you need to wire directly into the electrical service, then use a voltmeter to ensure that the line voltage is correct, then use the outlet tester mentioned in #3, above. Do
this before you connect any of your audio equipment. Chances are that your 120V gear won’t be too happy if it sees 220V for any length of time.
5.Cables that are too long are less likely to pick up hum if you uncoil them in their entirety, and then find a place to stow the excess. Leaving the excess coiled only helps the cable pick up hum more effi- ciently.
6.Don’t run unbalanced lines to or from the stage. It’s not the impedance, it’s the fact that they’re unbalanced. It’s a good idea to use a direct box to make the unbalanced source look like a microphone.
7.For really extreme cases, you may need to insert 1:1 or isolation transformers into each return line from the
8.Don’t cut the third pin off of the power cord. Carry some
9.If you bundle your cables together, don’t bundle AC wiring and audio wiring to- gether. Bundle them separately.
10.If your sound system insists on humming, you may need to teach it the words.
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(Roll credits please) Manual written by Jeff Gilbert, based on a vignette by Ron Koliha, with tidbits borrowed from almost everywhere. Manual then defaced with proofreading pens in the hands of Mackie’s legendary Tech Support staff. Manual composed on a
Mackie Designs is always striving to improve our mixers by incorporating new and improved materials, components and manufacturing methods. Because we’re always trying to make things better, we reserve the right to change these specifications at any time, without notice.
Mackie, the "Running Man" figure, and VLZ are trademarks or registered trademarks of Mackie Designs Inc. All other brand names mentioned are trademarks or registered trademarks of their respective holders, and are hereby acknowledged.
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