The SR-5 (at least the gold version) has a very sweet midrange to die for. Voices, strings and undistorted guitars sound supernatural with it. I never could give that one up. It's like the K-501 but warmer and even better in every category. I only need a better Stax amp for it. The SDX Professional is basicaly just a small SS Amp with integrated transformer box. The transformer coils mess up the signal phase and because of this the imaging and soundstage isn't perfect (it's more dynamic headphone like while keeping the other qualities of the stat).
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Current personal headphone ranking:
STAX SR Lambda Pro Classic, STAX SR-5 Gold, STAX SR-001, beyerdynamic)))) DJX-1, beyerdynamic)))) DT 990 Pro (250 Ohm), AKG K-501, AKG K-340, beyerdynamic)))) DTX 50, Cowon A3 Buds, beyerdynamic)))) DTX 20, AKG K-14P, Sennheiser Unipolar 2000
Home Rig: iMac -> M-Audio Firewire -> SRD-X pro -> Lambda Pro Classic
Portable 1: WavPack -hhx6 -> Cowon A3 -> DTX 50
Portable 2: iTunes AAC 128 VBR -> iPod 4G -> Stax SR-001
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