Patdon10 Posted November 3, 2010 Report Share Posted November 3, 2010 Ok. So I hooked up my sub yesterday, and it was thumping really nice and everything. I was driving to the grocery store and it just cut out. Today, I was driving to school, and I hit the brakes fairly hard and the sub cut in for about 2 seconds. Now i've been troubleshooting it. I have voltage from the Power wire, and trigger wire. The ground is a good tested ground. When I test for voltage at the speaker wires from the amp, there is no voltage. I wanted to make sure it's not the amp, so I changed amps, with the same results. The amp is turning on and definitely getting power, but isn't sending a signal to the sub. I (at least I think I did?) checked the voltage at the rca jacks and had no voltage. I checked the connection at both sides of the rca jacks and both look secure. Do rca jacks carry a voltage? What am I missing? I don't know why it would just suddenly cut out. Link to comment Share on other sites More sharing options...
JVC Posted November 3, 2010 Report Share Posted November 3, 2010 Ok. So I hooked up my sub yesterday, and it was thumping really nice and everything. I was driving to the grocery store and it just cut out. Today, I was driving to school, and I hit the brakes fairly hard and the sub cut in for about 2 seconds. Now i've been troubleshooting it. I have voltage from the Power wire, and trigger wire. The ground is a good tested ground. When I test for voltage at the speaker wires from the amp, there is no voltage. I wanted to make sure it's not the amp, so I changed amps, with the same results. The amp is turning on and definitely getting power, but isn't sending a signal to the sub. I (at least I think I did?) checked the voltage at the rca jacks and had no voltage. I checked the connection at both sides of the rca jacks and both look secure. Do rca jacks carry a voltage? What am I missing? I don't know why it would just suddenly cut out. Sounds like the woofer is blown, then that hard braking moved the cone, which if the woofer is toasted a lot of times the woofer will play when the cone is pressed in or pulled outwards (that happened with my 10" Type E). So when you slammed on the brakes that force pushed the cone in and allowed it to play momentarily until it went back to the position where it doesn't play anything, Did you run a break in on the woofer or did you pull it out of the box and plug it in and start wangin? I would imagine you toasted the sub with either too much power or something of the sort. That is my best guess based on what you told me. Sounds like the woofer is blown to me... borrow/buy a good working woofer and plug it in to your amp, then see if it works and that will determine what your real problem is. -John Link to comment Share on other sites More sharing options...
Patdon10 Posted November 4, 2010 Author Report Share Posted November 4, 2010 Well, today the woofer fell over and it started playing. It's playing fine now. Are you saying that the amp's speaker terminals don't necessarily have to have a voltage running to the sub? If that is true, I need to open up the sub and see what's going on. I think I remember someone telling me that the connections from the sub to the box will need to be soldered one day. It's an old sub. Link to comment Share on other sites More sharing options...
Malvasi Posted November 10, 2010 Report Share Posted November 10, 2010 Pull the sub out of the box and check the connections on the sub itself... it sounds as though you have a loose connection at the box... Worst case scenario is one of the connectors is actually separating from the cone which isn't hard to fix either. Link to comment Share on other sites More sharing options...
blazen244 Posted November 17, 2010 Report Share Posted November 17, 2010 Pull the sub out of the box and check the connections on the sub itself... it sounds as though you have a loose connection at the box... Worst case scenario is one of the connectors is actually separating from the cone which isn't hard to fix either. Ditto on checking the connections. The wire runing from the terminal to the voice coil is fragile once it's broken it done deal the only fix is to rebuild the cone. More than checking the voltage you can check the impedance at the RCAs and the amp inputs. You can also use something like an Ipod or other MP3 player with a 3/4" plug to RCA attached to verify input to the amp. Then if need be use another speaker for testing. This should prove out your system. Oh yea some amps need to see a load to put out a readable voltage. Link to comment Share on other sites More sharing options...
Account_Deleted_T5M Posted November 29, 2010 Report Share Posted November 29, 2010 ITS YOUR GROUND, had this happen in the 850, turned out to be the amp ground, if you notice it'll kick on for a second then stop Link to comment Share on other sites More sharing options...
ean carr Posted November 30, 2010 Report Share Posted November 30, 2010 do you have the sub wired properly? What is recommended ohm for amp and sub and how do you have it wired? Link to comment Share on other sites More sharing options...
boxpin Posted November 30, 2010 Report Share Posted November 30, 2010 I am going with ground or speaker wires touching ground or themselves. There are more variables though so I think everyones comments have validity to them. What size is the power wire? Where are you getting your power from? Where is it grounded? where are the speaker wires run? If you connect another speaker to the sub output does it shut off? So many options still open. Link to comment Share on other sites More sharing options...
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