Thanks for the replies, btw.
I have a budget Onkyo receiver that sounds quite nice with the KSC75's.
Just tried out the HD380 Pro at BB. Direct out to my IPhone. They sounded bumpin' and very Sennheiser. BB has the most jacked up demo network ever, and you're best off unplugging from their horrible little cluster**** direct out to your device, as every line out they offer to customers is beset with horrible audio demons I do not understand, but despise.
I tried the 558 at their swanky back station near the Magnolia joint. I was keenly aware that this headphone could not compete, open backed, against the blaring idiot din of BB, and spent more time being impressed by the 380 pro at the DJ station with it's deliciously controlled lower notes and soundstage.
BTW, I found the Koss DJ100 really fun, but very congested in comparison.
I LOVE the feel of oval circumaurals and am certain that both headphones would perform wonderfully with my Onkyo, and would like some quiet time with a HD558, as it's design lends itself more to soaring mids and a bigger soundstage.
Still, I was mightily impressed with the HD380 pros and I suspect that my Onkyo would make the mids really shine, as impressive as it was playing Art Pepper, Most Def, The Fixx, Mocean Worker, The Gorillaz, and Donald Fagen.
I couldn't hook the 558 up to my iPhone, as it was hard wired to its kiosk, and the audio in they provided was even worse than the standard BB noise bomb . I was forced to listen to their demos, a step up from the blue stations of hell, and I suspect that it did little to give the 558 a fair shake combined with the cacophony of BB.
Still, cool phones. I like.
Edited by Spacemodul8or - 6/9/13 at 8:52pm