ACFT DSNDS 1300 FT WITHOUT CLRNC.

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CLRED TO 7000 FT AND RPTED THE BEACON (IPL) IN SIGHT. CLRED DIRECT AT 5000 FT. FO WAS FINALLY ABLE TO RAISE COMPANY ON COM 2; WHILE I LISTENED IN. KEPT MY EYES OUTSIDE A LOT AS WE WERE GOING INTO AN UNCTLED FIELD AND OVERFLYING EL CENTRO NAS. NEXT THING WE KNEW; CTR WAS CALLING AND I SAW THAT WE WERE DSNDING THROUGH 3700 FT. TOLD FO TO CANCEL THE IFR AND CTR SAID 'GOOD NIGHT;' WHICH IT WASN'T ANYMORE! CONSIDERING ALL THE EFFORT MY FO AND I PUT INTO ATTITUDE AWARENESS; 'IT' FINALLY HAPPENED. ASSESSING THE SIT; I FIND THAT THE TONE OF THE ALT ALERTER IS NEARLY INAUDIBLE IN THAT I MUST TURN DOWN THE AUDIO PANEL VOLUME TO KEEP THE NEW ALT ALERTER AUDIO DOWN TO A REASONABLE LEVEL. MAYBE IF THE 2 ITEMS WERE COMBINED IN ONE UNIT; THE AUDIO WOULD BE MANAGEABLE! SO MUCH FOR TECHNOLOGY. NEVER HAD AN ALT BUST BEFORE (LAST 6 YRS) WITH ONLY THE ALT ALERTER; BUT GUESS I WON'T FLY INTO THE GND AT LEAST! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CAPT WAS TOTALLY EMBARRASSED OVER ALTDEV. THERE IS NO AUTOPLT ON THIS TYPE OF ACFT. IT WOULD HAVE HELPED THE FLC GREATLY. CAPT WAS POSITIVE THIS TYPE OF INCIDENT WOULD NEVER HAPPEN TO HIM; HE IS NOW EATING HUMBLE PIE.