Nasty slap echo

Josefm, This is why I always caution on using too much room treatment.

Streetdaddy, Instead of clapping at the speaker locations you should be clapping where you listen from. If you want to make this simple put your system on the long wall and you will only need to treat the wall behind your head. Unfortunately you will have to sit beside each other like normal people, but you will have a broader sound stage and you won't have to worry about side walls. You will get a bigger sound stage, better midbass, less room interaction, less room treatment required and you get to sit next to your wife.

BTW legend has it that the original Three Stooges has slap echo down perfectly in their listening room.

Curly: "A whooba whooba"!
Moe: "Shaddap and listen!" Slap!
Larry: "Leave him alone"!
Moe: Slap!
Curly: Nyuck Nyuck Nyuck!

You get the picture...

Really, leather is a problem? In my well treated room my leather couch and chair have no negative effect. I think leather is a non-issue to be frank.

Perhaps metal folding chairs are a bad idea:-)

Grannyring, Is leather a reflective surface or not? Listen with your head against the back of your leather chair then place a blanket over the chair and listen again. If you can't hear the difference then I guess it is a non-issue for you, but I can tell you it is an issue for me. It has the same effect as having your chair close the back wall only milder. If you don't want to go through the trouble of getting up to get a blanket just lean forward a little and tell me if the sound doesn't clear up a little.