@Hispls probably nailed it in the 5th reply to this thread.My guess... In the sealed enclosure, cone movement was less due to being in a sealed enclosure. The gain was set on the amp while the music was playing, Punch EQ was up... which boost up to 12db @ 45hz, Bass is up on the head unit, playing bass heavy music at high volumes... the sealed box saved the sub by limiting cone movement. The sub was moved to a ported enclosure tuned to "40hz". Here is what I think happened. Nothing was changed on the amp or head unit and the sub was put in the ported box. Music was turned on and turned up. Notes in the 35 to 50hz range were playing and the Punch EQ @ 45hz combined with the 40hz tune of the port was spiking frequencies in the 40's 10-14db higher than the rest of the music slamming the VC former over and over and over until it started having Kapton babies in the gap.
Sounds like mechanical damage due to wanging away way undèr enclosure tuning.
Might as well set it on the table, wire it up, plug it in a wall socket and have a laugh.
JK OP... please dont try that ^^^^
As far as an alt goes... for that amp as long as the battery has been upgraded and alt is at least working decent... id say just monitor voltage and see if a upgrade becomes necessary.
OP... I run a 750 watt 15 on 2Kish on stock fairly weak electrical (Honda), upgraded wire and a gr31 agm with only minimal voltage drop, the 750 watt sub is doing fine as the enclosure is a low 30's tune and designed for my particular sub at that power level.
Im smelling coils after a few minutes at high levels but no mechanical issues.... I just let it cool at relatively lower levels for a few... and repeat.
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