Mackie SR24•4 Owner's Manual page 58

3. Carry an outlet tester, available at any well-
4. If you carry enough equipment that you need
5. Cables that are too long are less likely to pick up
6. Don't run unbalanced lines to or from the
Appendices Appendices
56
stocked hardware store. Use it to tell you if the
outlet you're about to plug into is wired
correctly. Consider it cheap insurance.
to wire directly into the electrical service, then
use a voltmeter to ensure that the line voltage
is correct, then use the outlet tester men-
tioned 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.
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 efficiently.
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 front-of-house location to
your amp racks.
8. Don't cut the third pin off of the power
cord. Carry some ground-lifter adapters and
use them only when you have to plug into an
ancient two-wire outlet.
9. If you bundle your cables together, don't
bundle AC wiring and audio wiring together.
Bundle them separately.
10. If your sound system insists on humming, you
may need to teach it the words.