satish1015 Posted September 2, 2015 Report Share Posted September 2, 2015 hey guys... been a while since i posted on here! about a year or two ago i bought a used 12" lvl 4 m2 after purchasing my brand new one for a dual sub build that i never got to.. When i received it i did the push test on the cone and didn't notice and noise or rubbing and i hooked it up free air and gave it some power and didn't hear anything either.. so i figured it was all ok and packed it back up..I recently put the system back in and decided to swap the subs and open up the subs so i put the used one i bought in and at high volumes I get some kind of popping noise in the subwoofer with like none of the power of my original dc... with my 1 12 i used to get tremendous roof flex, with this the seats barely vibrate.. So I checked all my connections and voltages and I'm still getting the same issue! So i swapped the subwoofers, and what do you know! tremendous roof and windshield flex with my old lvl 4!Do you guys think one of the coils on the used on i bought is burnt? and what are some solutions? I tried reconing some old cerwin vega woofers i had laying around and that was a horrible fail so i don't want to do this on my own lolIf it helps the amp is a brand new crescendo symphony 1500.1 and voltage never goes below 12.5 on full tilt.. usually hovers around 13.0-13.2 Quote 2008 BMW 550i M Sport Build coming soon! 2000 Volvo s40 1.9TPioneer DVD navigation head unitO2 audio performance mid range speakers2 Crescendo PWX-6 Pro Mid Range Speakers2 Crescendo PWX-8 Pro Mid Range Speakers4 Selenium ST200 Super TweetersHifonics ZRX2000.4 Amplifier2- 12 inch DC Audio Level 4 m2Hifonics Brutus BXI-1610D Amplifier2 KinetiK HC1400R- Secondary BatteriesKinetik HC600- Secondary BatteryKnukonceptz 1/0 gauge big 3 upgrade Link to comment Share on other sites More sharing options...
will77530 Posted September 2, 2015 Report Share Posted September 2, 2015 first thing i would do is measure the impedance of the voice coils Quote Link to comment Share on other sites More sharing options...
satish1015 Posted September 2, 2015 Author Report Share Posted September 2, 2015 first thing i would do is measure the impedance of the voice coils I forgot to mention that I did that and reads around 1 ohm steady when i checked.. is it possible that the coils could be rubbing but not blown? Also, it looks like a m2 lvl 4 but is it possible that its not and im pushing it to its limit? Quote 2008 BMW 550i M Sport Build coming soon! 2000 Volvo s40 1.9TPioneer DVD navigation head unitO2 audio performance mid range speakers2 Crescendo PWX-6 Pro Mid Range Speakers2 Crescendo PWX-8 Pro Mid Range Speakers4 Selenium ST200 Super TweetersHifonics ZRX2000.4 Amplifier2- 12 inch DC Audio Level 4 m2Hifonics Brutus BXI-1610D Amplifier2 KinetiK HC1400R- Secondary BatteriesKinetik HC600- Secondary BatteryKnukonceptz 1/0 gauge big 3 upgrade Link to comment Share on other sites More sharing options...
will77530 Posted September 2, 2015 Report Share Posted September 2, 2015 each coil reads 1 ohm? or it reads 1 ohm after being wired to your amp? Quote Link to comment Share on other sites More sharing options...
satish1015 Posted September 3, 2015 Author Report Share Posted September 3, 2015 each coil reads 1 ohm? or it reads 1 ohm after being wired to your amp? actually i didn't think to check them each individually. it reads 1 ohm after being wired negative to negative and positive to positive from coil to coil... it's a dual 2 ohm.. so i supposed this meant both coils were ok Quote 2008 BMW 550i M Sport Build coming soon! 2000 Volvo s40 1.9TPioneer DVD navigation head unitO2 audio performance mid range speakers2 Crescendo PWX-6 Pro Mid Range Speakers2 Crescendo PWX-8 Pro Mid Range Speakers4 Selenium ST200 Super TweetersHifonics ZRX2000.4 Amplifier2- 12 inch DC Audio Level 4 m2Hifonics Brutus BXI-1610D Amplifier2 KinetiK HC1400R- Secondary BatteriesKinetik HC600- Secondary BatteryKnukonceptz 1/0 gauge big 3 upgrade Link to comment Share on other sites More sharing options...
will77530 Posted September 3, 2015 Report Share Posted September 3, 2015 i would just read them individual to be sure maybe he sent you a d1 by mistake and one of your coils is blown Quote Link to comment Share on other sites More sharing options...
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