Changed Speaker Placement NOW BOOMY

"I've never sat in front of Hyperions, but they look great."

Timlub, you make me feel better. The only thing I didn't like about Hyperions was black piano finish and coffin like shape. Now it is slowly growing on me. I even realized that possible scratches on black piano finish can be easily repaired by piano repair/restoration shop while scratches on wood veneer are almost impossible to erase.

Kal,
I've never read a thing on the subject. My Experience is just doing, doing, doing. Trial and error and being around alot of people who tried and failed many times before me. Everything that I've mentioned is proven only by me to me, But all used many times and as you can see, I've been creative more than once on making my own traps and diffusers. Now after 30+ years of mistakes, I typically am able to solve most issues, but one thing that I know is, I don't know much. If I were going to buy one of these two books, which one would you recommend?

Both books are excellent.

Anyway, if you can't move the speakers or listening seat, and if your main concern is with one person listening in the sweet spot, I suggest you go with parametric EQ. It will solve the problem at your preferred listening location and has a higher WAF than external traps. (You can build bass traps into walls, but that of course requires major surgery.)

Josh358 - That's exactly my situation but EQ won't help me getting rid of echo. What happens at lower frequencies is also echo in a sense that reverberation changes sound (bass attack, decay etc.)

I have EQ'd a few places in a professional environment and have experimented with eq's in audiophile systems. There is no doubt that if you have a spectrum analyzer and a mic that you can eq a room to be perfectly flat. It is a must in a church or even a night club. My experience in the audiophile home setting is not as good. There is always a grain involved or even though bass is now flat and accurate, the amp seems to have lost attack or mid range is natural, but has lost a sparkle or warmth. I prefer room treatments first and a RTA & EQ last. I am a electronics buyer (among other things) by profession, so I still go to quite a few shows. Recently I came across a well known mid to high end line (sorry, I forgot which one, I'll write if it pops in my head)that had an RTA and Mic Built into a Receiver, this is a line that I normally thought of as seperates. They eq'd the room fairly quickly and I have to say that I was quite impressed. No, not hard core Hi end, but Nice bottom, smooth mid, a high end that was not nasty and had a sound stage. So, I believe that it can be done. Maybe I haven't found a good enough eq.