Hey Thuan,
Sounds like your on the right track. With your set up I would check two things. First, I would make sure that both speakers are the same distance from the back wall. I know I have set mine up before and then rechecked the distance to the front wall and one would be off. Sometimes I get in a hurry and read my tape measure wrong. The second thing would be to get at least 9 feet back from the front plane of the speakers. I've found this to have quite an effect on soundstage and imaging.
Hope this helps.
Cheers,
Scott
Sounds like your on the right track. With your set up I would check two things. First, I would make sure that both speakers are the same distance from the back wall. I know I have set mine up before and then rechecked the distance to the front wall and one would be off. Sometimes I get in a hurry and read my tape measure wrong. The second thing would be to get at least 9 feet back from the front plane of the speakers. I've found this to have quite an effect on soundstage and imaging.
Hope this helps.
Cheers,
Scott