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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 lol

If 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

2008 BMW 550i M Sport

Build coming soon!

2000 Volvo s40 1.9T
Pioneer DVD navigation head unit
O2 audio performance mid range speakers
2 Crescendo PWX-6 Pro Mid Range Speakers
2 Crescendo PWX-8 Pro Mid Range Speakers
4 Selenium ST200 Super Tweeters
Hifonics ZRX2000.4 Amplifier
2- 12 inch DC Audio Level 4 m2
Hifonics Brutus BXI-1610D Amplifier

2 KinetiK HC1400R- Secondary Batteries
Kinetik HC600- Secondary Battery
Knukonceptz 1/0 gauge big 3 upgrade

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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?

2008 BMW 550i M Sport

Build coming soon!

2000 Volvo s40 1.9T
Pioneer DVD navigation head unit
O2 audio performance mid range speakers
2 Crescendo PWX-6 Pro Mid Range Speakers
2 Crescendo PWX-8 Pro Mid Range Speakers
4 Selenium ST200 Super Tweeters
Hifonics ZRX2000.4 Amplifier
2- 12 inch DC Audio Level 4 m2
Hifonics Brutus BXI-1610D Amplifier

2 KinetiK HC1400R- Secondary Batteries
Kinetik HC600- Secondary Battery
Knukonceptz 1/0 gauge big 3 upgrade

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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

2008 BMW 550i M Sport

Build coming soon!

2000 Volvo s40 1.9T
Pioneer DVD navigation head unit
O2 audio performance mid range speakers
2 Crescendo PWX-6 Pro Mid Range Speakers
2 Crescendo PWX-8 Pro Mid Range Speakers
4 Selenium ST200 Super Tweeters
Hifonics ZRX2000.4 Amplifier
2- 12 inch DC Audio Level 4 m2
Hifonics Brutus BXI-1610D Amplifier

2 KinetiK HC1400R- Secondary Batteries
Kinetik HC600- Secondary Battery
Knukonceptz 1/0 gauge big 3 upgrade

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