i did compare the 2 for upgrade , they have different between but not that obvious (a very little on audio part), if mirage not that hard to push , i rather save money to buy other things . may be a power amp . if u use power amp ,can blow z7 away easily . 6000 nopt a small amount , parasound only 1xxxx for new . if you are not going to add power amp ,then u can choose z7 and make your self feel better .