Some other info:
As you might have seen i used pretty thinck wire to the in and outputs and i used as short as possible wires. Also the audiorelays are as close to the connectors as possible and there are no audioconnections crossing the voltagelines to avoid humming and other noise.
In the final design i will also move the PSU section near the subwoofer output to the shielded section where the trafo is at, just to make sure.
The frontpanel is profeesionaly engraved at Schaeffer and so the letters wont come off or whatever.
The headphoneamp is done using a simple 5532 opamp stage but this will be done with a OPA opamp in the final version for even lower noise.
This version is build on veroboard (experimental printboard) but the final design will be on printed board.
When the unit is in 'normal' use (no muting, mono or whatever) all realys are in rest and so there is no voltage going through the relays, also to avoid noise.
The only relays in use are the input switching relays, they are switched on with the 3 steps frontpanel input switch.
It sounds great BTW! actually...it doens't sound at all
OK, now it's time for the pro's to have a look and comment!
BTW: I'm also thinking of designing a router/switcher for analog equipment, if you have any thoughts on that, please let me know!