Were these new when you boughþ them? If so, the break in process may be a factor. Based on what I've heard from others, expect about 100 to 200 hours of use to be needed for break in.
Eight inches??? You really need to get them out a bit further from the wall. I had the Studio 60 v2 a while ago. They were very good in the larger living room. But when I moved my system into a smaller dedicated room they overwhelmed the room.
As I recall, your Onkyo has tone controls, right? Turn down the bass a notch and perhaps turn up the treble a notch as well. I would try to move them further out into the room, but I realize that optimum placement is not always possible. That Onkyo is a damn nice little amp for the money, BTW.
Yep, boominess can be readily attributed to your walls and room. Try placing them further away from the walls both side and rear. Also, maybe if you have a finished basement, in my experience this is your best listening room due to the cement walls. I have the same 30k audio system and have used it in 3 different homes, each has had its issues with boominess, except for the finished basement with cement walls.
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