Although I've never used an adapter I'd expect that the difference would be dependent to a significant degree on the specific Stax amplifier and on the specific power amplifier that is being used with the adapter.
Over the years I've driven my Stax Lambda Pro headphones with a solid state Stax SRM-1 MkII amplifier, with and without a Stax ED-1 "Diffuse Field Equalizer," as well as with a tube-based Stax SRM-T1 amplifier. (All of these products date from the 1980s). By far the best sound quality was with the tube-based SRM-T1, which I continue to use after selling the other products some years ago. The SRM-1 MkII was quite disappointing in comparison with the SRM-T1, as was the SRM-1 MkII + ED-1 combo. Although on the majority of recordings the latter combo was preferable to the SRM-1 MkII alone.
Regards,
-- Al
Over the years I've driven my Stax Lambda Pro headphones with a solid state Stax SRM-1 MkII amplifier, with and without a Stax ED-1 "Diffuse Field Equalizer," as well as with a tube-based Stax SRM-T1 amplifier. (All of these products date from the 1980s). By far the best sound quality was with the tube-based SRM-T1, which I continue to use after selling the other products some years ago. The SRM-1 MkII was quite disappointing in comparison with the SRM-T1, as was the SRM-1 MkII + ED-1 combo. Although on the majority of recordings the latter combo was preferable to the SRM-1 MkII alone.
Regards,
-- Al