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Q. “WHY DOES MY SYSTEM HUM?"
A. BECAUSE IT DOESN'T KNOW THE WORDS.
This is what passes for humor in the
audio business.
Here’s the real answer:
If you have any electrical (60Hz) hum in your
system, you're going to hear it clearly as
soon as you hook up your subwoofer. Most
hum problems are caused by “ground loops.”
That is, the electrical grounds of the compo-
nents in your system are not at the same
electrical potential. A very common ground
loop source is cable TV. Disconnect the coaxi-
al cable from your TV and/or VCR. If the hum
goes away, the cable is the ground loop vil-
lain. In that case you need a 75 ohm ground
loop isolator. This device is about the size of
a pen and is attached to your coaxial cable
where it plugs into your VCR (or television).
You can obtain this device from some audio
dealers, Radio Shack stores, Zantech (1-800-
843-5465) or Channel Plus (1-800-999-5225).
Ground loops and hum can also be the result
of faulty electrical wiring in your home.
Consult a licensed electrician to evaluate
and, if necessary, repair the AC wiring in
your home. Light dimmers also tend to intro-
duce noise into audio systems. Remove them.
If none of our suggestions work for you, call
our customer service number.
SAFE LIMITS OF OPERATION
Your Polk Audio loudspeakers are made with
the highest-quality materials, insuring years
of great sounding, trouble-free performance.
However, damage to loudspeakers can occur
when an amplifier, regardless of its wattage,
is made to play at higher listening levels that
its power can clearly produce. (This is usual-
ly beyond the “1 to 2 o’clock” position on the
volume control.) This results in very high
levels of audible distortion originating in the
amplifier, which adds a harsh, gritty sound
to the music you're listening to.
Contrary to popular belief, a speaker is more
likely to be damaged by trying to get too
much volume from a low-powered amp or
receiver (than from a high-powered one).
MAINTAINING THE APPEARANCE
OF RM SERIES SPEAKERS
Your new speaker cabinet is made of a
rugged material that can be dusted or
cleaned with a moist cloth. Avoid harsh
detergents and cleaning fluids; they can
permanently damage the finish of your
speakers. Gently vacuum the grilles to
remove dust.
TECHNICAL ASSISTANCE OR SERVICE
If, after following these hook up directions,
you experience difficulty, please double-
check all wire connections. Should you
isolate the problem to the speaker, contact
the authorized Polk Audio dealer where you
made your purchase, or call Polk Audio’s
friendly Customer Service Department at
1-800-377-7655 (calls from US or CAN only)
from 9am to 6pm Eastern Standard Time,
Monday through Friday. You may also contact
us via email: polkcs@polkaudio.com.