finally reinstalled the HK subwoofer "properly" having redone the speaker foam surrounds with a $30 kit from "Speakerbits" Had been running a 'jury rig' previously due to water leaks (fixed). Cannot believe how good the full system is when the subwoofer is running properly with appropriate CDs. Also fixed the 'buzzing' tweeters... favourite Kiri Te Kanawa tracks fully restored to blissful levels All thoughts of an upgraded head unit now banished!