Yes 600w is fine for good bass. But it depends on the quality of the Sub and Amp.
Avoid the cheap stuff like pioneer/sony/boss/insertcheapbrandhere since most of the "well known common brands" are cheaply made and overpriced, and lie when they specify their wattage.
Go for a good european/american brand like JL Audio, Audison, Boston Acoustics, Focal, etc.. (dont use ebay since they sell a lot of fake speakers there)
Grab a 150WRMSx4 Amp, and bridge two of the channels to a decent 300WRMS+ Sub, and the other two to the fronts or rears
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