Ht802, there is a lot of good advice above (as is typical on Audiogn). I would buy the area rug first, then the books.
Is your hardwood floor on frame construction or over a concrete pad? This can be very important as regards floor vibration. If you have hardwood over "soft" floors, as I do, you will want to work on keeping speaker vibration from getting into the floor. You can easily feel this with your hands. In my case, floor vibration adds obscuring "grunge" in front of the music, reduces detail, and adds mid-bass coloration and tonal imbalance. It also blurs the "pace" of the music. This is not the problem you describe, but it made a big difference in my system.
Good luck....
Charlie
Is your hardwood floor on frame construction or over a concrete pad? This can be very important as regards floor vibration. If you have hardwood over "soft" floors, as I do, you will want to work on keeping speaker vibration from getting into the floor. You can easily feel this with your hands. In my case, floor vibration adds obscuring "grunge" in front of the music, reduces detail, and adds mid-bass coloration and tonal imbalance. It also blurs the "pace" of the music. This is not the problem you describe, but it made a big difference in my system.
Good luck....
Charlie