HI,i am new to this forum stuff but am in need of help, . just purchased some polk s55e ,, i am running them on a marantz pm 6005. not sure this is adequate to get the best from them!do i need any more power. the polk,s run on 20w - upwards, my amp is 45 w . should i invest in a different amp to get the best from them or will my marantz drive them adequatly. if i need to change my amp , any help /suggestion,s please . buget if i need a amp would be around £600 pounds!.