I have found the majority of the speakers at your local autobarns etc are crap.
I have tried a lot of the mainstream brands and been grossly disappointed. 20 years ago, I had a pair of 90W 2 way 6x9 Pioneers on my rear shelf. They had an awesome sound. Decent bass, excellent mid range, good high range. Eventually the sun killed the cones of the speakers, so I had to buy some new ones. I've tried the usual autobarn range of Pioneer, Kenwood, Sony and nothing has come close to matching my old 90W 2 way Pioneers. They all have a tinny, shallow sound and the bass has a harsh punch instead of having a nice solid thump. The only thing they do well is the higher frequencies. I listen to a lot of old skool rock, so I need a nice deep bass (not doof doof) and a 'warm' filling mid range. I don't want a bulky, heavy subwoofer setup, I shouldn't even need one for a modest setup. I ended up buying an amp believing it was the head unit, but all the amp did was amplify the **** sound and further distort the speakers.
I've spent of lot of money and effort on home audio. Good quality home audio gear power rating is usually rated in RMS and distortion levels at specific db levels. With my car, I'm not that fussy (because you are never going to overcome the fact that the acoustics of a car are terrible). I just wanted decent sound for when I'm doing long drives on the highway. So I didn't go into the research too deep, just picked reputible brands, looked at the power rating on the box and assumed 240-300w peak power handling would at least handle the quoted 45W from my head unit (which of course would only be a peak rating anyway). WRONG.... most of these supposed 300W speakers have a 'nominal' power rating of 20-30W max. Really it should have clicked when I saw the pissy little magnet on the back of them, but as said I'm not a big car audio person, so didn't think much about it.
So I've ditched those speakers and started doing my homework, read a whole heap of speaker reviews, tests and decided on a set of 'Kicker' 6x9 speakers. Of course they cost double the price, but they have a peak 300W rating with a 120W nominal. The magnet on these suckers is heavy, and about 3/4 the size of the speaker. And a MASSIVE difference in sound quality. Only problem is it now highlights that the Pioneer speakers in my doors are junk. So they'll also be going to the bin and I'll do my research on on 6 inch door speakers.
But yeah, kind of annoys me that manufacturers are putting BS figures on their speakers. It's VERY misleading. Cheaper home audio gear tends to quote PMPO figures, but the difference between the peak and RMS or nominal figures are not nearly as great as car audio.
). Just whacking them into the stock spacers behind the trim isn't enough to make them sound good.