I have experience with quite a few Dayton drivers and you really have to use them within the published limits. The build house uses regular CA glue on the spider so they will crack if you push them even a tad hard. I had a pair of the RS 180's and with 80 RMS and a 63Hz high pass, the spiders cracked...returned for refund due to manufacturer defect. PE accepted them and recognized the issue. Before that I had the same thing happen to me with the Dayton HO 15's. Having done tons of installs and being around this hobby for 20 years, these were the first speakers I have ever had fail on me. If you want a really solid midbass, here are some options in the same price range:
The Madisound Speaker Store
The Madisound Speaker Store
The Madisound Speaker Store
The Madisound Speaker Store
The Madisound Speaker Store
Concerning frequency coverage, it is generally a good idea to have one pair of speakers cover a specific range. A good starting point is:
Sub 0-80
Midbass 80-350
Midrange 350-6k
Tweeter 6k-up
This isn't the perfect range, but it is a good starting point and keep the drivers in their critical frequency ranges.