Can I connect 2 Adcom Preamps?


I am new to this and I have the following system, Adcom GTP-600 preamp, Adcom GFA-5500 and Adcom GFA-6000 amps. I have been running my phono through a Recoton converter. Recently I acquired an Adcom GTP-500 preamp which has phono inputs, but not enough space for everything I have. Is it possible to just add this preamp to the setup I already have?
gwoman
Ok just one more question I am almost done getting all this to work. I have connected all my speakers to my GFA-6000, but where do the inputs go to? I don't see anything on my GTP-600 that would accommodate them.
The GTP-600 is a surround preamp/processor so the outputs are labeled FRONT RIGHT & LEFT, REAR RIGHT & LEFT and there are (2) CENTER CHANNEL outputs. They are located right under the S-VIDEO inputs on the GTP-600.