Thought I'd let you guys in on (hopefully) one of my main secrets to success. Aperiodic enclosures! Basically they flatten out the impedance curve of the speaker (varying resistance, not always 4/8ohm like the specs state) so it's a nice even load for the amp. Which makes the amp very happy and stable. Best comparison I can think of is like trying to sing standing still or trying to sing jumping up and down.
An aperiodic mat, in my case squashed fibreglass insulation,
impedes and as such flattens out any bumps in the curve (which I'm lead to believe the Morel Elate has a rather nasty one around 400Hz

). The downsides are less volume and less low end extension which should be no problem at all due to having high powered amps and no need for <30Hz to be produced at extreme volumes.
The front and rear wave-fronts need to be kept completely seperate and so the rear portion, after travelling through the mat, need to be vented somewhere. That somewhere is outside in my case due to not having a boot. It just so turns out that the Mighty Boy comes well equipped for aperiodic enclosures

First photo shows the hole for the midbass vent and the second one for the sub:
That second photo brings up a whole other issue... RUST! Need to get that sorted when the paint is done

I'll need to do tests to make sure no water is going to come down that hole.
Running the sub in an aperiodic enclosure is still slighty up in arms but is 80% likely. I just need to sort out how structually sound it is to be bolting a sub to the windsreen sill bit

I'm also slightly worried about increased volumes outside of the car from venting outside. I like to listen loud and would generally like to contain that to inside the car rather then disturbing others.

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