the so called stock 6x9s put out so called bass...and the 4s put out highs...the type rs are good 3 way speakers.i left my 4s out when i replaced my 6x9s...just left a hole in back dash.if u do this and have a sub box.u will get much better bass response out of subs seeing is how the bass will have 2 more ports to escape out of.my opinion is leave the 4s out either way.i have memphis 5 1/4s and memphis 6 x 9s...and get all the high and mid i need outta them.