parrot 3200ls and kenwood kdc mp728

Maybe someone can help me out on this one.  I called Crutchfield tech support and asked for help with installing the Parrot 3200LS with my Kenwood radio.  It has 2 amps connected, both via RCA jacks.  The guy at tech support said that my best bet would be to use an external speaker, but that's not something I have room for.  I have a regular cab pickup truck and don't really have anywhere to put an external speaker.  Can anyone recommend a good way to connect the Parrot to my setup.  Oh, I have a 98 Dodge Dakota R/T.  Thanks in advance to anyone who can shed some light on this for me. 

The external speaker is fairly loud. You can wire tie (zipp tie) it under the dash on the driverside to a wire harness or something rugged. be careful not to interfere with the steering. You can also hardwire the speakers. This can be done using a cheap line output converter.