Its been a long time since I've owned a set of Polks. (ex wife sold mine while I was out of town 6 years ago) I just purchased a set of SDA 2b's and replaced all the drivers with MW6503 drivers. Being out of town working I only had my brother-in-law's Onkyo HT receiver to test with. The tweeters seemed way harsh for some reason. I don't remember my old SDA's being this harsh. These new speakers will be connected to a Jolida SJ 801A tube amp with a Luxman D-105u tube CD player. My amp has no bass or treble controls and I'm wondering if I'll have the same harshness when I hook these up. Is there a replacement for the tweeters to bring down the brightness of the highs? Possibly a mod? Thanks in advance for the help. Chuck.