AN APCH CTLR RPTR ON THE MULTITUDE OF MISSED CLRNCS BY ACR FLCS IN THE DEN APCH AREA. SOME RESULT IN POSSIBLE CFIT OR NMAC SITS.

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COMS BTWN CTLRS AND PLTS IN THE DEN APCH AIRSPACE ARE LIKE NO OTHER I HAVE EVER SEEN. SINCE COMING TO DENVER 3 1/2 YRS AGO; THERE HAS BEEN THE PROB (AT LEAST FROM THE CTLR'S PERSPECTIVE) THAT PLTS DON'T PAY ATTN. I HAVE WORKED APCH AT LAX AND DFW AND NEVER (EVEN CLOSE) DID WE HAVE THIS PROB. TURNS TO FINAL; DSCNT AND CLB CLRNCS ARE MISSED (NO RESPONSE). READBACKS ARE WRONG (IE; DSND AND MAINTAIN ONE-THREE THOUSAND IS ROUTINELY READ BACK AS ONE-TWO THOUSAND). ONE CREW ISSUED ONE-THREE-THOUSAND AS THREE THOUSAND AND WAS STOPPED AT ONE-ONE THOUSAND BY THE CTLR. WHEN QUESTIONED. THEY CLAIMED CLRNC TO THREE THOUSAND AND WERE HEADED TO IT. IN DENVER? ANOTHER CREW ON DEP; ASSIGNED FL230 ON INITIAL CONTACT; THEN PROCEEDED TO FLY INTO HIGHER TERRAIN AT 10000 FT CLAIMING NO CLB ISSUED. TAPE REVEALED CLB ISSUED; CREW READBACK OF CALL SIGN ONLY. ACFT CONSTANTLY ANSWER FOR ONE ANOTHER; EVEN DIFFERENT COMPANIES. THIS PROB IS SO SEVERE; IT IS ONLY A MATTER OF TIME BEFORE AN ACCIDENT OCCURS. AIRWAYS FACILITIES HAS CHKED RADIOS AND CLAIM NO PROBS FOUND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ATC RADIO STATUS: IT WAS THOUGHT THERE WAS A PROB WITH THE RADIOS. AIRWAYS FACILITIES TECHNICIANS CHKED THE PERFORMANCE; NOTHING WRONG WITH ATC RADIOS. THERE HAD BEEN; HOWEVER; ONE INSTANCE WHERE THE RPTR NOTED DURING A FAMILIARIZATION TRIP THAT DEN DEP CTL VOLUME WAS LOW COMPARED TO TWR AND CTR VOLUMES. ACFT RADIO STATUS: RPTR AND ASSOCIATES THINK THAT SOME ACR CREWS ARE USING SPEAKERS INSTEAD OF HEADSETS; LOSING THEIR CALL SIGNS OR MISINTERPING CLRNCS. THERE WERE NO INDICATIONS OF A 'SIMULTANEOUS XMISSION' PROB. AREAS OF PROB: MOSTLY ON APCH CTL; WORKING WITH 'FEEDER' CTLRS AND FINAL APCH CTLRS. ATTEMPTS AT CORRECTION: MEETINGS WITH UNION REPRESENTATIVES; FACILITY REPRESENTATIVES; FACILITY MGR; FAA FACILITY MGR; LABORATORY TECHNICIANS. ONE ROADBLOCK IS 'DOCUMENTATION.' FACILITY MGR WANTS TO DOCUMENT INCIDENTS; BY CTLRS TAKING NOTES OF FLT NUMBER AND EVENT. RPTR SAID THEY COULD PULL ANY SET OF RANDOM TAPES AND GET THE DOCUMENTATION NEEDED. 1 OR 2 AIRLINE MGRS CONTACTED; NO RESPONSES. ANOTHER AIRLINE PLT PASSED ON INFO THAT THE ACR INSPECTORS HAVE PLACED THIS SIT AT A 'LOW PRIORITY.