The Audeze is one of the best headphones made and your Onkyo would be outclassed.
The Icon is nice and should do the job- the 110 ohm impedance of the Audeze is tricky but the Icon should be able to handle it as it has taps for a number of impedances up to 600 ohms.
Our own MP-1 preamp can do it too (its line stage is a miniature tube power amp with a direct-coupled output- no output transformer); it has all the preamp functions built in so less boxes. Some of the Audezes I have seen need some power but this model does not, and the impedance is no worries for our MP-1 to drive it directly.
Your taste in music genres has nothing to do with how the preamp, headphones or headphone power amp sounds! If the electronics are good, all musical genres will sound good on them.
The Icon is nice and should do the job- the 110 ohm impedance of the Audeze is tricky but the Icon should be able to handle it as it has taps for a number of impedances up to 600 ohms.
Our own MP-1 preamp can do it too (its line stage is a miniature tube power amp with a direct-coupled output- no output transformer); it has all the preamp functions built in so less boxes. Some of the Audezes I have seen need some power but this model does not, and the impedance is no worries for our MP-1 to drive it directly.
Your taste in music genres has nothing to do with how the preamp, headphones or headphone power amp sounds! If the electronics are good, all musical genres will sound good on them.