In Australia we get the 6 disc changer as standard with the standard base 6 speaker system.. so the extra money we pay is for extra speakers and wattage and/or DSP... the standard 6 speaker system does not have tweeters only midranges as well :-( We have two options here.. Hi-Fi (12 speakers 200 watt ..standard in US) and Hi-Fi Professional (16 speakers 600 watt DSP).. I went the Hi-Fi option...!