Hello all. I recently picked up a pair of monitor 12 speakers and I've been listening to them paired to my Pioneer SX-D7000. I've noticed that sometimes I get a scratchiness that I think is coming from the tweeters. Sometimes I don't hear it and then on another song it becomes very pronounced. Is this a common problem with the sl2500 tweeters? Would replacing them with the RDO-198 tweeters eliminate this scratchiness? Thanks in advance.