12" dc lvl 4 m2

[satish1015]

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

[will77530]

first thing i would do is measure the impedance of the voice coils

[satish1015]

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?

[will77530]

each coil reads 1 ohm? or it reads 1 ohm after being wired to your amp?

[satish1015]

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

[will77530]

i would just read them individual to be sure maybe he sent you a d1 by mistake and one of your coils is blown