If you think that one is really good, you should hear the ATH-2 Ref
not correct regarding the ATH-2 models. They use Hashimoto transformers.I believe the AirTight SUTs use Tamura transformers. Their amps all use them, and the impedance choices on their multi-input ATH-2A and ATH-2 Reference boxes are consistent with other SUTs that use Tamura. Which exact transformers they use from the Tam range is another question.