2 IFR ACFT MAKING VISUAL APCHS TO AVL ARPT. IT'S NOT INDICATED; BUT THE VISIBILITY MAY HAVE BEEN A PROB. ACFT X WAS VECTORED A CLOSE DOWNWIND AND RELEASED TO THE TWR. ACFT Y WAS VECTORED ALMOST STRAIGHT-IN AND TURNED OVER TO THE TWR ABOUT 6 MI OUT.

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I WAS WORKING LCL CTL/GND CTL COMBINED. THE WX WAS VFR WITH SCATTERED CUMULO NIMBUS CLOUDS. RWY 34 WAS IN USE. ACFT X; A CARJ ON A VISUAL APCH; WAS ON L DOWNWIND. APCH CTL HAD POSITIONED ACFT X ON A CLOSE DOWNWIND APPROX 2 MI W OF THE ARPT TO ASSIST THE PLT IN SEEING THE ARPT. I HAD CLRED ACFT X TO LAND. ACFT Y; AN AC69; WAS SE; INBOUND FOR A VISUAL APCH; BEING VECTORED BY APCH CTL TO FOLLOW ACFT X. ACFT X WAS AT APPROX 4600 FT (FIELD ELEVATION 2165 FT) PASSING THE ARPT; AND CONTINUED SBOUND ON DOWNWIND. WHEN THE ACFT WAS ABOUT 2 MI S; I ENCOURAGED A TURN TO BASE LEG AS SOON AS FEASIBLE; BECAUSE APCH CTL HAD TFC ON R BASE TO FOLLOW THEM. ACFT X BEGAN A TURN TO BASE; AND I PROJECTED THAT THE ACFT WOULD JOIN FINAL NEAR THE ENNKA OM. APCH CTL HAD TURNED ACFT Y; NOW ABOUT 6 MI SE; SOUTHWARD TO FOLLOW ACFT X. ACFT X MADE A WIDE TURN TO BASE LEG; AND AS I WATCHED THE RATE OF TURN; I BEGAN TO REALIZE THAT THE ACFT WOULD FLY ACROSS THE FINAL. THEY DID IN FACT CROSS FINAL 4-5 MI FROM THE END OF THE RWY. I ISSUED TFC TO ACFT X ON ACFT Y. THE ACFT X CREW ADVISED THAT THEY HAD SEEN THE TFC ON TCASII AND ADDED THAT THEY HAD BEEN VECTORED TOO CLOSE TO THE ARPT TO MAKE THAT KIND OF TURN. ACFT X CONTINUED TO 1 1/2 - 2 MI E OF FINAL; PASSING APPROX 800 FT BELOW AND 1 MI N OF ACFT Y. ACFT Y SAW ACFT X AND FOLLOWED THE CARJ ON A VISUAL APCH; EXTENDING APPROX 2 MI W OF FINAL TO SPACE HIMSELF BEHIND THE CARJ. I BELIEVE THE CARJ MADE AN EXCESSIVELY WIDE TURN TO FINAL; CONTRIBUTING TO THIS SIT. I SHOULD HAVE ANTICIPATED THE SIT AND ADVISED ACFT X OF THE TFC ON R BASE FOLLOWING HIM; AND CAUTIONED HIM TO NOT FLY THROUGH THE FINAL.