Polk Audio 650 instruction manual It doesn’t know the words

systems where the 3dB boost is not needed, this switch can be useful for providing a quick boost for bass-shy program material. Most people prefer more bass output for movies than music, so you can use this switch as a handy way to adjust bass levels as you switch between movie to music sources.

SWITCHABLE PHASE ALIGNMENT

(FIGURE 10)

Have someone else switch between these two settings while you sit in your favorite listening position. Use music with good bass and a deep male vocal. When you hear the best balance of deep bass and natural lower octaves of the male voice, you have achieved optimum phase tuning.

MAINTAINING THE APPEARANCE OF YOUR PSW650

Your new speaker cabinet is finished in woodgrain vinyl that can be dusted or cleaned with a moist soft cloth.

Avoid harsh detergents and cleaning fluids, they can permanently damage your speaker’s finish. Vacuum the grilles to remove dust.

Q. “Why does my system hum?”

A. “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 are going to hear it clearly once you hook up your sub- woofer. Most hum problems are caused by ground loops. That is, the electrical grounds of the components 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 or VCR. If the hum goes away, the cable is the ground loop villain. 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 introduce noise into audio systems. Remove them.

If none of our suggestions work for you, call our customer service number shown below.

TECHNICAL ASSISTANCE

OR SERVICE

If, after following the hook-up direc- tions, you experience difficulty, please double check all wire connections. If the problem is that you are not getting enough bass, make sure the AC cord is connected to a live AC power source and that the power switch is set to the “on” or “auto” position. Make sure that your electronic equipment is operating cor- rectly by hooking up another speaker to the speaker output. Should you isolate the problem to the speaker, contact the authorized Polk Audio dealer where you made your purchase. Authorized Polk Audio dealers are the best source for advice and assistance.

Our customer service representatives are happy to answer your questions and provide fast, friendly service. In North America call (800) 377-7655, Monday through Friday, 9:00 AM through 6:00 PM Eastern time. Or you can e-mail us at our Internet service address: polkcs@polkaudio.com.

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