If you plan on keeping the factory head unit, you can use a Line Out Converter to give you some RCA Pre-Outs for an amplifier. Otherwise, as mentioned above just stick to low RMS wattage speakers speakers.
I have turned my subwoofer off and my 6.5" speakers give a decent amount of midbass for just easy listening. But they do struggle to hit low bass frequencies. I have them set to filter at 80Hz tho so im not sure how low they could hit either.
I would recommend upgraded front speakers and a low RMS 12" subwoofer in the trunk. Sent from AutoGuide.com Free App
2011 Kona Blue MT82 V6 Mustang Pony Package 3:31 Gear Ratio, Interior Upgrade Pkg, Security & Shaker500/Sync
Mods (in order of installed): AM Bama SCT SF3 Tuner w/ 87 Hybrid Tune, Airaid CAI, Hurst Billet Plus 2 Short Throw Shifter, Lethal O/R H Pipe w/ Stock Exhaust, Blacked-Out Tints on Rear Windows, Full Ceramic Tint on Front Windows, Metra Touchscreen Dash Adaptor, Single DIN Head Unit, 6.5'' Component Speakers Fronts, Stock Rear Speakers, 10'' Sealed Subwoofer, 4ch. and 1ch Amplifier. LED licence plate lights, LED interior dome lights, FRPP/Dynamic shocks and struts, SR Performance lowering springs, GT500 Strut Mounts, BMR Adjustable Panhard Bar, BMR LCA's, BMR Relocation Brackets. Rear Seat Delete.