Tip & How-To about Audio Players & Recorders
Sound system speakers have standard polarity which is indicated either with a "+" or a "-", or with Red and Black colors near the speaker terminals. This same polarity marking is also found on the sound system amplifier section. Most speaker cable has a polarity indication; either color coded, or a physical difference in the wires. Reversed polarity results an obvious decrease in bass, and a hollow sound in the mid range frequencies. If your speaker cable has no obvious polarity indication, you can check the polarity as follows; connect a 9V battery to each speaker cable for no more than about a second; long enough to see the woofer cone move. When the + battery terminal is connected to the + speaker lead, the woofer cone will move out. When you have this situation, label the positive speaker lead, either with tape, or by tying that wire in a simple knot. Make sure both cables are checked.
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