SF340 FLC LEVELS AT WRONG ALT AND FAILS TO CONTACT CTR DUE TO WRONG FREQ SELECTED.

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THE FLT WAS FROM DTW TO ERI. WE DEPARTED NORMALLY AND WERE HANDED OFF TO DTW DEP CTL. THEY SAID 'RADAR CONTACT CLB AND MAINTAIN 11000 FT.' THIS IS ABNORMAL; WE USUALLY RECEIVE 5000 FT OR 7000 FT UNTIL WE GET ON WITH ZOB. DURING THE CLB WE WERE HANDED OFF TO ZOB. THE FO RESPONDED TO DTW AND DIALED IN THE FREQ. AS THE FO WAS CHKING IN; I WAS GETTING OUT SOME CHARTS; MY ATTN WAS NOT ON WHAT THE FO WAS DOING. AT 11000 FT I CALLED FOR THE CRUISE CHKLIST. 11000 FT IS A NORMAL FLT PLAN ALT FOR THIS RTE OF FLT. AFTER THE CRUISE CHK WAS COMPLETED; WE STARTED A CONVERSATION ABOUT THE RECENTLY COMPLETED WORLD SERIES. AFTER A BIT; THE FLT ATTENDANT CAME UP TO CHK ON US. I MADE A COMMENT THAT THE FREQ WAS UNUSUALLY QUIET. I THEN CHKED THE FREQ ON COM #1 AND DID NOT RECOGNIZE IT. I ASKED THE FO IF HE HAD GOTTEN A RESPONSE WHEN HE CHKED IN AND HE SAID YES. THE FREQ IN THE COM WAS 132.65; THE NORMAL FREQ FOR CLEVELAND IS 132.45. I TRIED TO RAISE CLE ON 132.65; BUT NO ONE ANSWERED. BY THIS TIME WE WERE ABOUT 50 MI FROM THE ERI VOR SO I TRIED TO RAISE ERI APCH. I DID GET HOLD OF ERI AND HE ASKED IF WE GOT HUNG UP ON A FREQ. LATER I LOOKED AT THE FLT PLAN AND NOTICED THAT WE WERE FILED FOR 15000 FT. WE USE A COMPUTER SYS SO THE FLT PLAN COULD BE DIFFERENT EACH TIME. THE FO WAS AN EXPERIENCED PLT AT THE COMPANY AND I WAS LULLED INTO A FALSE SENSE OF SECURITY. I SHOULD HAVE CHKED THE FLT PLAN AND MONITORED THE RADIO COMS MORE CLOSELY.