2* CDP-CX450 plus...

Has anyone tried this before: two CDP-CX450 plus one (e.g. CDP-CX250) changer that has an adress switch on one A1 bus? problem is that the CX450 doesn`t have any adress switch. I was told that therefor 1 CX450 uses adress 1 and the other uses adress 2. That would leave in theory adress 3 for a unit that can be set to it (in other words that has an adress switch, like the CDp-CX250).

Any help is apreciated before i go on and buy another CX450. I also posted that question to Sony support. If i get any decent answer there i`ll post it here.