Thanks for your help!
I figured out what the problem was. When I was playing SACD music, the small rattling noise was coming out and at the same time, my Adcom GTP-880 (A/V Preamp) was blinking at the volume level meter. Every time when my drivers would make that rattling sound, again, the volume meter level would blink again. I just noticed that tonight. I could not figure out why it was doing that. I went through the user's manual for the Adcom GTP-880 and it said that if the input level for the Coax if too high, you need to adjust the level. So for all the electronics that uses the Coax such as a SACD player, I need to adjust that input level accordingly. Once I adjust it lower, everything was absolutely fantastic! The input level was on max (+10) and I adjusted it to (-6). It made a huge difference to the music. It did not sound distorted anymore. I am not sure if all Preamp are made that way when connecting an SACD player.
When I listen to regular CDs and not my SACD player, everything sounds great at any levels because my regular CD player is connected to the Preamp with an Optical cable. I am not sure why there is an input level adjustment for connecting an SACD player??
I just bought my SACD player and just beginning to learn more about the player. I think SACD sounds really good. I think it sounds much better than regular CD player. However, there are not much SACD discs available to purchase and very few titles out there. I think SACD discs are going away.
Thanks again for your help anyway!!