Picking out auto speakers with bass you can feel?

Son, a speaker is for the mids and highs. NOT "bass you can feel". 30-45hz is what you hear coming from a vehicle, a concert, and from your next door neighbor.

For "bass you can feel", you need a single 12" or a single 15" sub around 1,000 watts RMS, a good quality ported box and a monoblock.

Loud "bass you can feel" is around 40-55hz. That's what you and your buddies feel inside the car bumping through your body. 25-35hz is what annoyed people are tired of hearing at a further distance.

They just usually complain about cars with LOUD subwoofers and LOUD exhausts.

If you re just upgrading your stock speakers with the same size speakers you re not going to get powerful sounding bass.

Bass that can be felt is a result of high output low frequency sound. "Low frequency" is relative, but typically low bass is the stuff around 50hz and lower, especially 30-40hz. Producing a lot of output in that range requires subwoofers, and usually involves several hundred of watts of amplifier power.

A GOOD pair of 5x7 s/6x8 s simply cannot do much at 40-50hz, even if they re getting ~100w. Speakers that size are often filtered to remove the low frequency material because they are designed to play mid/high frequency material loud and clear -- not bass.

To make a significant upgrade to your system I would go with a powerful 4 channel amp, a 10 or 12" subwoofer and a good box.

The 4 channel amp would provide two channels to power your component speakers (with a crossover to cut the bass) and 2 remaining channels that would be bridged to power the sub (also crossed over to remove the highs).

a] Yes you need an amplifier

b] The Polk DB series speakers have better bass than the GTO860's

c] For bass you can really feel a subwoofer Is required

d] If your car came with the Sony DAEP 5.1 premium sound system it already has 2 amplifiers.