Some people already know, I'm a very beginner at this. I have a set up of the following things: Marantz PM8000 amplifier Marantz DV7600 (DVD and SACD player) Marantz ST6000 tuner Some companies modify your cd or tuner. In holland we have Heart and Van Medevoort. I was just wondering some things: What do they do during a modification? Is it worth the money to modify a DVD player and a tuner? Is this set up worth modifying? Hope to hear soon.