I'm looking for a frequency response curve of ipod classic 7th gen, not 6th gen (unless there is no difference internally aside from HDD capacity.) Preferably with various types of load and also a line-out FR curve. I'd also be thrilled if someone can tell what chips are used internally. Apparently the 5th gen ipod video used wolfson micro chips, though not the 8740 that everyone knows and loves, it was a 5789 or something like that. I think the latest ipod touch and iphone all use Cirrus Logic chips, dont know about the op-amps. No clue what the ipod classic 7th gen uses.