Sandawgk5 Posted July 6, 2014 Report Share Posted July 6, 2014 First off, this site is a wealth of knowledge. Second, I figured I would put this here incase anyone else might be having the same issue. I learned yesterday my drivers door speaker was not working, so after doing a bit of reading here and on a few other sites the google machine hit on, I grabbed my multi meter and set off probing . All speaker channels from the SC-816 output about 20mV DC. I am not sure why I thought it would be more but it is pretty low. The fact that all channels had the same out put from the HU and were with in a few mV at the speaker connector I was pretty sure the problem was not wiring or the HU. So the next logical was step was to replace with a known good speaker. I took the passenger door speaker and plugged it in and low and behold I got clean clear music. That verified it was the speaker as the culprit, now to figure out why. I could not find any clear information about the internal resistance of a voice coil. It should be close to what the impedence is with my limited electrical knowledge, so I started probing again. The good speaker had an internal resistance of about 4 ohms, oddly enough it is a 4 ohm impedence speaker. As I pushed on the cone it would changea bit, not much but it would move. The bad speaker had 800 ohm of internal resistance, it would move too when I cycled the cone but it went from 800 to 1K ohm. I could not see any indications of overheating so I am not sure why it was so high, but it seems with resistance that high the 20mV doesn't have enough umph to push the driver. Like I said this was all informational incase someone else is having similar problems. Third and final, I don't have a CD Changer but for some reason I have a cable plugged into the CD port on the back of the HU. Like I said it is a SC-816 with no prologic or amp that I can find. Does anyone know what that cable is for? Thanks Ira Link to comment Share on other sites More sharing options...
sjmcarz Posted July 6, 2014 Report Share Posted July 6, 2014 The cable in your cd changer port is probably for pre-wiring. Check behind the panel in the left rear corner of your car and I'll bet that the other end is there. Link to comment Share on other sites More sharing options...
Sandawgk5 Posted July 6, 2014 Author Report Share Posted July 6, 2014 Thanks, I will check that. Are you talking about in the trunk? Link to comment Share on other sites More sharing options...
floggingmike Posted July 7, 2014 Report Share Posted July 7, 2014 Yes, in the trunk under the panels and whatnot (not quite sure, I have a wagon so I'm assuming you have a sedan? Model and year would help) there should be a DIN plug for the factory CD changer option. All models equipped with a radio w/ CD changer capability came with the cable prewired to the CD changers location, regardless of whether or not that option was checked off for that specific car. My car has the cable, but no 6 cd changer. Link to comment Share on other sites More sharing options...
Sandawgk5 Posted July 26, 2014 Author Report Share Posted July 26, 2014 Sorry aboot the car and year. It is a 98 s70, I didn't see a cable in the trunk but I also didn't dig too hard. I do know I don't have a changer in the trunk though . Thanks Ira Link to comment Share on other sites More sharing options...
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