The Polk DB402's are 'marine certified' IP55, which implies at least some water resistance. I used them in my rears, not because they were marine certified, but I've been happy with Polk's in the past. I personally don't see ever getting a level of water on the speakers that would cause an issue.I don't see anyone installing waterproof speakers, does everyone think that's unnecessary?
Well priced as well at $55/pr on Amazon, plus a high 90 dB efficiency which is perhaps a bit less important when running the kicker amp, but very important if you're going to try and run replacement speakers off the stock head unit alone.
As for bass blockers, you are not likely to "hear" that much of a difference with them installed... 4" speakers just aren't very good at reproducing low frequency sounds, and while they might be rated to perhaps 60 hz, the db drop-off by that frequency is going to be huge. As for preventing damage, filters are really important on high frequency drivers (tweeters) to block out mid and low range frequencies to protect them from damage, but a 4" coax already has a filter for the tweeter driver, and the 4" driver portion is pretty robust. If it wasn't, the manufacturer would be installing their own inexpensive capacitor to avoid warranty claims. Knocking off the really low sub 60/80/120 hz stuff with the kicker amp function should be more than sufficient, and even that isn't really needed. My opinion of course, but it's an informed opinion.
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