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<blockquote data-quote="qtipextra" data-source="post: 2811829" data-attributes="member: 555270">Today, when a sine sweep of 10-60hz was randomly picked, I looked back and something seemed a bit weird looking at the subs, but I was driving so I didn&#039;t have a chance to really observe what seemed different. When I got a chance, I pulled off the side of the road and watched what happened. It kinda seemed like one was moving more then the other. I didn&#039;t have my DMM so I couldn&#039;t check the coils then. I couldn&#039;t really tell what was wrong, so I just drove the rest of the way home.Then I got my DMM and checked total resistance. It read .7 ohms (Subs are wired to a 1 ohm load). Then I hopped into my car and played a 23hz tone at a lower level, and slowly increased it to see if I could see anything happening. One of the subs didn&#039;t move as much. I got out of the car to look at a side angle, and I could definitely tell that the one didn&#039;t move as much. It actually looked like it was being pulled back a little bit, as if there was a slight negative DC voltage on the coil.So I pulled out the sub and checked individual coils (Each coil is 4 ohms). Each coil read about 3.8 ohms. And now, being puzzled, I ask you for suggestions.Thanks</blockquote>

[QUOTE="qtipextra, post: 2811829, member: 555270"] Today, when a sine sweep of 10-60hz was randomly picked, I looked back and something seemed a bit weird looking at the subs, but I was driving so I didn't have a chance to really observe what seemed different. When I got a chance, I pulled off the side of the road and watched what happened. It kinda seemed like one was moving more then the other. I didn't have my DMM so I couldn't check the coils then. I couldn't really tell what was wrong, so I just drove the rest of the way home. Then I got my DMM and checked total resistance. It read .7 ohms (Subs are wired to a 1 ohm load). Then I hopped into my car and played a 23hz tone at a lower level, and slowly increased it to see if I could see anything happening. One of the subs didn't move as much. I got out of the car to look at a side angle, and I could definitely tell that the one didn't move as much. It actually looked like it was being pulled back a little bit, as if there was a slight negative DC voltage on the coil. So I pulled out the sub and checked individual coils (Each coil is 4 ohms). Each coil read about 3.8 ohms. And now, being puzzled, I ask you for suggestions. Thanks [/QUOTE]

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