I did the same thing about six months ago. I don't have the dp34 switch in my setup but I don't think it makes any difference.
Just take the cable currently going to the 501 and connect it to the supplied separator and the two cables from the separator to the two inputs on the receiver.
After many phone calls I managed to convince them that I could hook it up myself and got them to ship me a 722. Cost me $75.00 instead of the $125.00 that they originally wanted.
You will probably have to go past the normal CSR's as they cannot override the installation requirement. I was already working with a higher department on another problem and got my upgrade through them.
Hope this helps.
Just take the cable currently going to the 501 and connect it to the supplied separator and the two cables from the separator to the two inputs on the receiver.
After many phone calls I managed to convince them that I could hook it up myself and got them to ship me a 722. Cost me $75.00 instead of the $125.00 that they originally wanted.
You will probably have to go past the normal CSR's as they cannot override the installation requirement. I was already working with a higher department on another problem and got my upgrade through them.
Hope this helps.