hi jassy "volume level 14 shake and distort" is not a good thing. you should get this fixed.
i crank up to mid-20s regularly. My rear left speaker has some bass trouble on some particular notes/frequencies, but they are few and far between. But I would like it sorted.
But worse still, my front left tweeter sounds horrible when certain frequencies travel thru it. I haven't been in for a warrantly/vehicle inspection yet (2000ks approaching), but when I go in, I'll be asking for the speaker to be replaced, cause frankly, it sounds like it has a tear in it.
and when i've spent the money on great sound in a great car... i expect no less. I will be getting the left front speaker fixed. The rear bass problem, I can probably live with, it's just a few loud bass notes that make it shake.
otherwise, i'm 90% satisfied with the jbl system. it does have lots-a-watts. level 26 is just plain 'loud'
the way i like it.