Re: Extra Speakers and Speaker Fitment
If you just add extra speakers in with the main 4, you will be lowering the impedance to a 2 ohm load on the head and will likely burn it up.
I can recommend some good replacement 6x8 speakers for amping with a 4 channel amp or others to power with the head-only or just compnonents in front are great with a sub in back.
Hopefully, your sony head has a highpass filter so you can seperate the lower freqs out of your full range speakers and to your sub.
2002 4 dr. SuperCab EdgePlus 3.0 l - 5R44E trans. - 3.73:1 ratio open diff. - airbox mod - throttle cable mod - 2.5" Maqnaflow SI/SO catback - Pioneer headunit & sub, Alpine amp, Infinity Kappa 6x8 door speakers, 64GB iPod with 3000 songs