Not enough information.
Are you using a receiver and how is it set up? Are you using room correction or not? It is VERY unlikely that they have a "weird crossover", so the excess bass is either your placement/room acoustics or something in the receiver setup.
It is also strange that they could put out excess bass at all since they only have single 5-inch drivers and are only rated to go down to 60 Hz!
Are you using a subwoofer? Try them with no subwoofer and see how much bass there is.
The Monitor 40 has significantly more bass than the RTi-28 and is a better speaker in general IMO.
Originally Posted by Jukebox305
I got a pair of polk rti-28 bookshelves for $50 on craigslist but I like the sound of my polk CS1 a little more than the sound of the rtis. Also they have a weird sort of crossover and play too much bass. I have been tinkering with them a bit but I am thinking I should sell them for around $150 and just buy monitor 40s to match my CS1. Good idea or no?