| | 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.
'02 Edge Plus SuperCab 5R44E 2wd 3.73 3.0 Fleetside - Magnaflow 2.5" si/so catback exhaust - Pioneer/Alpine/Infinity Kappa sound