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me? ill make a whole video now over 5 mins long of the hatch rattling.. nah uh.. ok im done..

problem: it requires energy to flex sheet metal.
where does that energy come from? your audio system.
where would that energy be better used? INSIDE your car, producing audible sound.
Translation? Flexing roof = wasted energy = loss of SPL and SQ.
Resonating metal does not a good acoustic environment make.

GlassWolf wrote:problem: it requires energy to flex sheet metal.
where does that energy come from? your audio system.
where would that energy be better used? INSIDE your car, producing audible sound.
Translation? Flexing roof = wasted energy = loss of SPL and SQ.
Resonating metal does not a good acoustic environment make.

That may seem correct in theory, but in real world tests..preventing the flex of a roof and or hatch can sometimes lose you SPL.

what you're seeing is most probably the sound deadener absorbing the energy instead of reflecting it (lack of hard reflective surfaces) which will give a more 'dead' and natural response, but the reflections may help with the SPL. Either way, thin sheet metal resonating is still losing energy, and sound outside the car, is sound that's not inside the car.
Fairly hard to argue that.

yea your right kiki but im louder with no deadening thats all i need to know.

GlassWolf wrote:what you're seeing is most probably the sound deadener absorbing the energy instead of reflecting it (lack of hard reflective surfaces) which will give a more 'dead' and natural response, but the reflections may help with the SPL. Either way, thin sheet metal resonating is still losing energy, and sound outside the car, is sound that's not inside the car.
Fairly hard to argue that.

Yea, I wasn't arguing that part..I was just talking in terms of SPL. You're bound to loose energy somewhere.

That's why competitors brace instead of deaden

oh well hell.. i just saw the actual video for the first time.i was looking at the free air video :P i do sort of agree with justin, i want to see more of the sub in action, not an entire video of roof flex. i want 54mm of xmax!

90% of the people gawking at 54mm of x-max will throw it in a ported box and kill off the advantages.

54mm x-max= a potential (but not likely) 3db increase compared to a 27mm x-max subwoofer. A 27mm x-max will get (potentially) 3db louder than a 13.5mm subwoofer. So we have a woofer that has about the same output as two midline subwoofers of similar design, most likely with much less total power at that and much higher buying cost.

are you guys referring to my video when you are talking about the flexing? if so i can make a video of whatever, just let me know what you wanna see.. i was going to do it today but it was too dark.. i may do it tomorrow.. let me know..