Im choosing the AQhdc3 18 over the FiQ 18

but bigger xmax SHOULD mean more potential to move air
my 9518g has a pretty low xmax, around 20mm if i remember right, maybe even lower.

it doesn't get very loud or anything //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 
fi q would sound better but the hdc3 will get louder.
And you've heard them both and can compare //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

I have BOTH subs and SQ is pretty much equal. I actually think the Q is a little muddier on the bottom end. But I do have more EQ in my car then the GF's car with the Q.

 
My Q was loud enough to drown out a 15" L7 in a prefab ported box off a ZX750.1 about ten feet away.
My roof flexed like a mofo.

Edit: Not done anywhere where I would be a public disturbance.
GF's car was louder/better sounding then 2 L7's in a pre fab ported box. I felt bad for the guy with the L7's //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 
GF's car was louder/better sounding then 2 L7's in a pre fab ported box. I felt bad for the guy with the L7's //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

My buddy temporarily had 2 12" L7s in a prefab ported box off his KX1200.1.

I was not impressed, whatsoever. His R's in a prefab were MUCH, MUCH louder.

L7's were a lot cleaner though.

I hope for hype's sake that L7's improve 300% with a proper box.

 
My Q was loud enough to drown out a 15" L7 in a prefab ported box off a ZX750.1 about ten feet away.
My roof flexed like a mofo.

Edit: Not done anywhere where I would be a public disturbance.
wait...which sub was in the prefab ported box at 750rms??

and about the 9815 or 9518...which ever you posted... I know its louder... BUT... then whats the point of a company making a bigger Xmax than the other?

 
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