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Just a couple questions. Looking at getting a pair of these to replace my HD439's. I've read in many places that an amp is highly recommended to drive these cans. Now, I have a few amps. I've got an Objective 2 (from a drop last year,) a home built tube amp and a home built CMOY amp. Which of these is suitable?
Probably all of them? I can't say much for your home built stuff but 7xx does say max input power of 200mW with 62 ohm impedance.
Max Output (33 Ohms) 613 mW
Max Output (150 Ohms) 355 mW
O2 easily drives it well beyond max power. 7xx isn't crazy inefficient, just a little too hard for standard devices and better options out there if you plan on not using an amp. O2 and CMOY (assuming it's more than 7.2V ->barely enough power-> 14V is plenty) probably will sound somewhat similar -relatively- CMOY might be lacking -while the tube will give you the warmth (distortion).
Now is 7xx a good match for O2? Shoulder shrug. Opinions opinions opinions. My headroom and homemade amp sound good to me -> medium high'ish power with flat freq. response amps ->similar to the O2.
I wouldn't replace your 439's, just add 7xx to the collection :D. Quick glanced over the 439's and they're easily driven and closed correct -> good for in public and mobile devices. You may find 7xx bass lacking until they're broken in, especially if you're comparing it to closed ear bass cans.
A buddy of mine just got a pair of K7XX last night. He came over to let me try them on all of my setups. They sound really clean and warm on the tube, but a little muddy on the CMOY. The CMOY has an OPA2132 in it running on 12V so it *should* be sufficient given the information you've provided. The O2 sounded really good too. I never really planned on replacing the 439's, I more meant to use the K7XX as the daily drivers. My Sennheiser's have been through hell, though and the left channel is starting to get a little quieter than the right. A result of never having any other headphones to use when testing amplifier builds.