I have Sennheiser HD600 (with a Cardas cable upgrade) and the original Valhalla (and the Uber Bifrost DAC), and I love the combo. I've been trying to decide if I want to upgrade to a Valhalla 2, or if I want to wait for the next iteration (since V2 has been on the market for a while). I'll get the Multibit upgrade for the Bifrost at the same time.
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