So, I'm not that wrong. The only knob I was not sure off, but twisted anyway is the PCM setting in SqueezeBox Server. I turned it off and now the music seems more like that what the G98 produces. The G98 is wired to the G68 with the (3) blue Meridian digital cables (the Touch with one blue cable). And yes, I tried the DTS test and the system is bitperfect. WIFI isn't an issue. By the way, I'm very pleased with the sound now. I use "Squeezecontrol" on a (android)smartphone (it's for free (the app, not the phone!)) and that works fine/perfect.
Are there any hikers who found a android musicplayer for FLAC? I could find about 3, among them "Meridian" (what's in a name!) but neither of them worked (despite of what was announced).
Greetings, Paul.

G68ADV, G98DH, 7000, 5200, 5200HC, JVC LCD, Samsung HD cable-receiver, Gefen 4x2 HDMI switcher, MIT cables and Logitech Harmony 1000.