bigtinybob Posted February 16, 2018 Report Share Posted February 16, 2018 after installing my Rockford prime 500 and my p3 Rockford it played about 2 mins max before going into protection mode.so I check my wiring on the amp and subwoofer.and I also noticed the sub was moving but no sound..this was at 2 ohm.i then put my alpine sub back in and it played just fine but it was at 4 ohm...so I'm kinda confused /either the amp is messed up at 2 ohm or the sub is messed up somehow.if the amp runs fine at 4 ohm and not at 2ohm then shouldn't it do the same at 4 ohm......sorry if this is confusing but I'm confused Link to comment Share on other sites More sharing options...
PC Principal Posted February 16, 2018 Report Share Posted February 16, 2018 Sounds like something is not wired correctly to me. Perhaps the impedance is too low sending the amp into protect? What kind of P3 is it? Dual 2ohm or dual 4ohm voice coils? Use this to help you wire up the P3 properly: http://www.rockfordfosgate.com/support/wiring-wizard/ You will want to wire it so that it matches the recommended impedance of your amplifier. 2007 Toyota FJ Cruiser RF Power T1000 BDCP RF Punch 400-4 2 P2D4 12's Link to comment Share on other sites More sharing options...
bigtinybob Posted February 16, 2018 Author Report Share Posted February 16, 2018 it the dual 4 ohm wired to 2 ohm amp is the prime 500.everything is wired right I have rechecked everything 3 or 4 times....the thing that gets me is the sub plays great when wired to 8 ohm but at 2 ohm it starts doing this....and now the amp don't go into protection mode but the sub is still moving .it does it worse when the car is running that's why I think it my amp Link to comment Share on other sites More sharing options...
PC Principal Posted February 16, 2018 Report Share Posted February 16, 2018 Interesting. That is the mono amp correct. It is rated at 2ohm so it should be fine running at such. If it is playing fine at 8ohm, but not at 2 then it sounds like the amp is fine. Perhaps there is a speaker wire grounding some where that you are not seeing? Im not sure, sorry. Wish I could be of more help. Hopefully someone with a little more expertise will chime in soon. 2007 Toyota FJ Cruiser RF Power T1000 BDCP RF Punch 400-4 2 P2D4 12's Link to comment Share on other sites More sharing options...
bigtinybob Posted February 16, 2018 Author Report Share Posted February 16, 2018 just talked to support and they think something with the wiring inside the subwoofer is causing it since the amp plays fine at 4 ohm with a different sub hooked to it Link to comment Share on other sites More sharing options...
8ten8 Posted February 16, 2018 Report Share Posted February 16, 2018 You can check the voice coil impedance of your speaker using digital multimeter. Remove the speaker, place it magnet down on a flat surface. Set your multimeter to ohms (upside down horseshoe). Insert the test probs in the + - speaker terminal of one voice coil. Should read around 3.7ohm. Do the same to the other voice coil. They should both read around the same Link to comment Share on other sites More sharing options...
ckeeler11 Posted February 16, 2018 Report Share Posted February 16, 2018 How did you set your gain? And as 8ten8 recommends check impedance of the sub do each coil and then all together. Link to comment Share on other sites More sharing options...
bigtinybob Posted February 16, 2018 Author Report Share Posted February 16, 2018 i did a check on the p3 impedance each side is showing 3.7-3.8 and when wired it shows 2 I also called them again and they are gonna replace the sub cause they said the voice coil was defected when it starts to play...since my amp plays the alpine at 4 ohm well they see no issue with the amp and if all else fails and the new sub does the same then they will replace the amp Link to comment Share on other sites More sharing options...
bigtinybob Posted February 20, 2018 Author Report Share Posted February 20, 2018 has anyone cut open a Rockford sub or any sub for that matter,,to get my replacement sub from Rockford I have to cut the come open to get the s/n from the inside .I'm assuming its the cover over the voice coil.. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.