CVG CTLR CONCERNED ABOUT ACR RADIO PRACTICE AND NON RESPONSIVENESS TO ATC INSTRUCTIONS.

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I AM WRITING TO INFORM NASA ON WHAT APPEARS TO BE A CONTINUOUS PROB. I PERSONALLY HAVE HAD PROBS WITH ACR X PLTS CHRONICALLY MISSING CTL INSTRUCTIONS. THESE INSTRUCTIONS ARE MORE IMPORTANT IN A TERMINAL ENVIRONMENT DUE TO THE PROX OF OTHER ACFT. ON OR ABOUT JUL/THU/03; WHILE WORKING AN ACR X CRJ2 INBOUND TO CVG FROM THE NE; I ISSUED INSTRUCTIONS FOR THE ACFT TO 'TURN L HEADING 200 DEGS; MAINTAIN 4000 FT UNTIL ESTABLISHED ON THE LOC; CLRED ILS; RWY 18L APCH.' THERE WAS NO RESPONSE. I WAITED A FEW SECONDS AND RESTATED THIS CLRNC; BUT THE ACFT WENT SLIGHTLY THROUGH THE LOC. NO LOSS OF SEPARATION OCCURRED; BUT THERE WAS AN ACFT AT 3000 FT ON THE RWY 18R LOC. SIT LIKE THIS ARE NOT THE EXCEPTION. DURING DEP; ACR X PLTS MISS CTL INSTRUCTIONS TO CLB AND TURN THE ACFT. ON OR ABOUT JUL/MON/03; WHILE WORKING A DEP SECTOR; I ISSUED INSTRUCTION FOR AN ACFT TO 'CLB AND MAINTAIN 13000 FT;' CONTACT ZID 119.55.' THE ACFT DID NOT RESPOND. I RESTATED THE INSTRUCTIONS WITHOUT SUCCESS. THE ACFT LEVELED AT 11000 FT (HE WAS STOPPED FOR XING TFC). I ADVISED ZID OF THE ACFT GOING 'NORDO' (NO RADIO); AND CONTINUED WORKING. IN ABOUT 20-25 MI; THE ACFT CALLED AND ASKED IF HE COULD CONTINUE HIS CLB. HE WAS WELL OUTSIDE MY AIRSPACE; SO I INSTRUCTED HIM TO CONTACT CTR AND ADVISED HIM I TRIED REPEATEDLY TO CONTACT HIM. NO OTHER CARRIERS I WORK IN CVG HAVE PROBS RECEIVING INSTRUCTIONS LIKE ACR X DOES. I WOULD SUGGEST THAT PLTS BE TOLD SIMPLY WHAT I STATED ABOVE. OPS IN THE TERMINAL ENVIRONMENT ARE EXTREMELY IMPORTANT; AND THAT MISSING INSTRUCTIONS CAN BE A DANGEROUS THING. FURTHERMORE; I BELIEVE THAT PLTS SHOULD BE ADVISED THAT WHEN IN A TERMINAL ENVIRONMENT; HEADSETS SHOULD BE USED IN ADDITION TO A STERILE COCKPIT BELOW 10000 FT. WHILE IN THE SPEAKER; ANY ALARM SOUND; BELL FROM THE CABIN; ETC; CAN DISTRACT THE FLT CREW AND LEAD TO A MISSED INSTRUCTION. WITH CABIN PERSONNEL EITHER READYING THE CABIN FOR LNDG; OR FOR INFLT SVC; CALLS FROM THE BACK CAN COME MORE THAN AT CRUISE. HAVING THE CTLR 'IN THE EARS' OF THE PLTS CAN REDUCE OUTSIDE NOISE; AND POSSIBLY LEAD TO INSTRUCTIONS BEING CAUGHT WITH MORE REGULARITY.