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I have a Tansio Mirai TSMR-3 in excellent condition (as good as new). PM me if you're interested.
You can check out the specs and related info in...
Driver - 4 Balanced Armatures (2 x Knowles 22955 & 2 x Knowles 29689)
Features - 4-way crossover 2 tubes
Impedance - 15ohm...