RonRizz

I agree with Matt here. I have the Hertz 165 XLs and they do a remarkable job in the low end, but they cannot replace the naunces a true subwoofer brings to the party. A good friend of mine owns a shop, and competes in both Iasca and Meca with me. We had the RTA in his car for tuning prior to state championships, and his door speakers, with subs off hit 30 hz. Of course they don't have the authority of a 10" or 12" sub. The casual listener can sit in my car with the sub turned off, and not notice that its missing....But when I turn it on, it opens up everything else, not just the sub-frequencies, and thats when the eyes light up, and they hear the true sound.
In a properly tuned system, the subwoofer should not be overpowering, and actually a flat frequency response sounds rather lifeless in the lower octaves, but when they are there, it makes everything else shine. Its a total package. Just for giggles, turn off your fronts and just listen to your sub, see how odd it sounds by itself...add everything else, and its good to go. They work hand in hand, and shouldn't be separated.
DECENT Bass from a 6.5" component speaker...Of course. DECENT SUB Bass... No.

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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals