p-309,Onkyo Europe - The P-309M pre-amp and M-509 power amp adapted Onkyo's “double super-servo scheme”. With power amp connected to pre-amp via servo-sensor cable, the distance between them was electrically zero. Together,2025年最新】Onkyo M-509の人気アイテム - メルカリ,Oldplayer - ONKYO Integra P-309, ONKYO Integra M-509. | Facebook,ONKYO パワーアンプ M-509 | 広島のオーディオ、ホームシアターの販売・通販ならサウンドマック