So what I did here is to put the excellent transformers into a much better enclosure with my own bias supply to maximize their potential. On top of that the input to the transformers is protected from overload and the output has a clamp circuit so it can never damage the headphones connected to it. This is a fully passive circuit which only kicks in if the transformer peaks at roughly 550Vpp, 1100Vppss. Any higher than that and you run the risk of damaging Pro bias headphones.

There is nothing here in the signal path except the transformers and the input protection circuitry. The left and right channels are also isolated so no issues with using bridged amps. A common ground will turn them into smoke right quick so I would never set it up like that. The boxes can be set for either 117V or 230V with an internal switch.

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