2nd order x-over needed?

um, okay, i do have a fairly newbish setup going right now. JVC KD-G400 Head Sony Xplod 4x6 fronts Lightning Audio 6x9 rears Lightning Audio 12" subs and a Jensen JXP680 amp driving subs and rears. My problem is that when i turn the volume up, the front speakers distort and belch from too much bass. I already have a 1st order crossover installed. Caps inline with front speaker positive. The caps are rated at 133µf, and remove bass from 300hz and below @ 4ohm. Would installing a second order crossover help the bass overload on the fronts? Should I select a different rating capacitor for the crossover? Or does anyone have any ideas how to resolve this issue? I dont have the money for new speakers or anything right now, so i'm stuck with what i've got. But any help would be greatly appreciated.

You don't have those fronts powered by an amplifier?  That's probably the problem...getting crap from the deck.  If you buy coils and caps to make a 2nd order for those Sonys then you've exceeded their value with things that try to fix them.  You should be able to find low-cost speaker replacements if you look hard, try also the buy/sell forum here.  And you HAVE to power the front main speakers with an amplifier.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

i just might have an old amp in storage.... i think it was a Jensen Nitro, 2 channel, 200 watts.... I'm gonna have to grab a shovel and a dustbrush to dig it out and clean it up, IF i still have it

BUT... and this is a very large buy, my previous head a Pioneer rated at 45 watts per channel didnt produce this belching sound. And my new KD-G400 does, even though its rated at 50 watts x 4. o0o00o0o00oo i know what to do now.... screw it, i found the amp, so i'm gonna pick up a distribution block tomorrow and throw it all together.... Would it be safe to mount a 200w amp under the passenger seat?