They don't come with foam plugs and it's not the deep bass port output (~50Hz) that i'm hearing it's more around the 100Hz range. It's a unique tuning to be sure. I'm not sure what Revel was thinking with that boost
Easily solved by a trip to the hardware store, if you are so inclined. As you know, it'll change the overall shape of the roll-off and will most likely smooth out that hump, which could help with the upper harmonics where you are finding it objectionable. Of course, the room will have its say at those frequencies.
It is an interesting design choice for Revel, and it could certainly be problematic in a 2.0 setup. I can envision a scenario where it could be helpful in a 2.1+ system. For those who want to maximize sub extension, the trade-off is typically reduced midbass output. A two-way bookshelf is at a disadvantage in such a system. That response could potentially help with integration so the overall system wouldn't have some midbass dropoff, again depending on setup and the room.
The DIY community came up with a novel solution: basically a two-way sub system. A sub, or more likely a set of subs
, designed for low-end extension and other subs tuned higher for mid-bass output. I was skeptical at first about its efficacy and the potential for creating other problems, but with a little work I've found it quite effective. But, I digress...
My apologies to the OP for the off-topic side discussion.