> I believe the one thing to be concerned about when > replacing speakers is the > "ohmic-value". In order for the speaker to sound > right,it must have the same ohmic-value as the ones Actually, the two most important characteristics of a speaker (in terms of quantifiable measurements, at least) are dB/1 watt (sensitivity) and frequency spectrum. A typical speaker has a sensitivity of around 90 db/1 watt, that is, for one watt of input (usually at a specific frequency, like 1kHz) it will produce 90 dB of sound pressure. You want your speakers to have roughly equal sensitivity, so that the sound will be balanced front and back (and right-left) Since its hard to determine what the sensitivity of old speakers is, its best just to replace them all. Frequency spectrum is basically the range of audio that the speaker can reproduce without distortion or sound pressure drop off. A good, full range auto speaker should reproduce 40Hz to 16,000 Hz reliably. (the range of human hearing is 20Hz to 20,000Hz roughly, but sounds above 16,000 and below 40 are rare. Also, your stock factory stereo probably can't reproduce these frequencies anyway) I had a problem once because I needed a set of 4" speakers...I bought a set of 4" woofers from Radio Shack, but they were woofers, and hence would not reproduce above about 5,000 hertz. The sound was very deep, with no high end. It wasn't the speakers' fault, it was me for using the wrong speaker. In general, radio shack speakers are good for auto use. I particularly like their 5 1/4" dual cones and the 4x10 which fits nicely in the front center speaker cutout of my Satellite. I haven't experienced their 6x9's (yes, those are the size for the rear package shelf, at least in my '67 Imp) but I imagine they would be a good speaker. Ohms are most important in terms of your radio unit, and how much of a load it can drive. Ohm values lower than 4 are a real problem for most radios; I try to stick with 8 ohm speakers for safety. Lower Ohms means higher current, for a given voltage. Voltage=Current*Resistance (V=IR) R=Resistance in Ohms. ===== --Mike Pittinaro 'Tis Christmas again Have a happy holiday Imperially __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/
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