A room with a tile floor and concrete wall will be very bright (an exaggeration of high frequency content) because the materials will cause the sound to bounce around. One of the ways that you could help to tame the sound would be to add a big throw rug between the speakers and the listening position.

Book shelved lined with books of various depths at the points of first reflection will also make a big difference. You don't want the spines of the books which are facing into the room to be even. Make sure that they are staggered to help break up reflections. The point of first reflection is fairly easy to find. While one person sits in the listening position have a second person hold a mirror against the wall and walk until the person sitting in the listening spot can see the reflection of the speaker. Then have them mark the spot and continue walking. Each side wall will have two spots that should be treated, a first reflection point for the left speaker and for the right speaker. This is a really handy of making sure that the side walls aren't over treated.

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A room with a tile floor and concrete wall will be very bright (an exaggeration of high frequency content) because the materials will cause the sound to bounce around. One of the ways that you could help to tame the sound would be to add a big throw rug between the speakers and the listening position.

Book shelved lined with books of various depths at the points of first reflection will also make a big difference. You don't want the spines of the books which are facing into the room to be even. Make sure that they are staggered to help break up reflections. The point of first reflection is fairly easy to find. While one person sits in the listening position have a second person hold a mirror against the wall and walk until the person sitting in the listening spot can see the reflection of the speaker. Then have them mark the spot and continue walking. Each side wall will have two spots that should be treated, a first reflection point for the left speaker and for the right speaker. This is a really handy of making sure that the side walls aren't over treated.

That's a good start.

Go look around at the Real Traps site and you'll find good free info. I bet the owner would even spend some time talking about your individual room.