I did some research but couldn’t put together some details. I have an existing 4-channel amp with 70rms per channel. 2 pairs of the same 2-way speakers in the front and the rear. I am fine with the sound but I need more bass. I am not interested in boxed sub in the trunk or beefed up system. I am not looking for crazy bass where you hear the car next to you at the stop light. Reading on the net points me to two budget 6.5" drop-in woofers with frequency range of 60 Hz - 3300 Hz with high Qts like 0.55 guideline to follow. Well, I am just not sure. Budget with low rms drop-in 6.5 woofers can be purchased from parts-express. I was wondering if a pair of 6.5 woofers will produce better bass than a pair of 2-way speakers that has frequency range of 58 Hz - 16k Hz. Could a 2-way speaker ever hit low notes like a woofer even when advertized low Hz unit? Is there some kind of guideline to follow for a simple setup? I appreciate any opinion. Thanks.