It is probably a besound 2300 or beocenter 2300. That should have an AUX port on the back, next to the powerling for the speakers.
You can find cable from the AUX to the IPOD plug at your dealer or on ebay.
I have that running with my BS2300.
Cheer
JK
BS9000, BS2300, BC2, BL2500, BL3, Bl2, BS1, BV8, BC4, A8