I am not satisfied with Alpine Type X sub. It plays lower frequencies better if frequencies <50Hz.
I have been looking for a better IB driver. I had a discussion with Kaigoss
here.
I am considering two drivers
JL 12W7 vs
Fi IB3 12
Now looking at their specs here is my judgement and score of each
__________________JL 12 W7 ----VS----------Fi IB3 12----------winner
Fs:_________________27.2Hz -----------------23.6Hz-------------Fi
Qts:________________0.482 -------------------0.57-------------JL in my case
Vas:________________66L----------------------83.2L--------------JL
Xmas:_______________29mm------------------ 30mm-------------none
Efficiency (1W/1m)____ 86.2 dB------------------83.2 dB-----------JL
RMS________________750W--------------------550W
My explanation to these:
-Fs: Surely Fi wins and can play lower than JL.
-Qts: For IB ideal 0.7 Qts. If you start adding anything in the boot, Qts will start increasing. My boot is mostly hal full so with Fi sub, it will start to roll off sooner (as explained by
John). John also explained that with lower Qts, less power will be required for the driver to reach its max xmas.
-Vas: it should be 10XVas for IB or minimum 4XVas. So if you calculate, JL 10X Vas will be closer to BMW boot space.
-Xmas: difference of 1mm is not significant.
-Efficiency: JL seems more efficient.
So in my perception and going by the attributes on the papers, JL wins it by 3:1.
If a person keeps car's trunk empty and if Fi wins Qts in that case, then the score is 2:2.
Well both of them are good drivers, but I am going to try JL on this occasion.