Well if you ever add an Opal to the Io let me know what you think. The Io can swing a mean sine wave so I don't think lack of input sensitivity of any modern amp will be affected by the abiltiy of the Io's drive. But who knows, this is widely uncharted and when I asked Aesthetix about this they suggested to try and see.
I have not had the need to add a line stage to gain dynamics in my system. Dynamics and sensitivity is largely system dependant right from the source to the speaker along with the room interface.. a additional line stage may or may not help. For example I'm not a fan of passives..but that's just me YMMV and all that.
As for the Wilson's, Nuttella mentions the review in Soundstage which may give you some information...but with this kind of investment you really need to try first. Hebert may be on his last few chassis of Topaz and they may or may not go back into production when those chassis are used up and he moves on to his more expensive and elaborate designs. It may be close to last chance to buy an amp of this caliber from Wyetech at "reasonable cost".
I have not had the need to add a line stage to gain dynamics in my system. Dynamics and sensitivity is largely system dependant right from the source to the speaker along with the room interface.. a additional line stage may or may not help. For example I'm not a fan of passives..but that's just me YMMV and all that.
As for the Wilson's, Nuttella mentions the review in Soundstage which may give you some information...but with this kind of investment you really need to try first. Hebert may be on his last few chassis of Topaz and they may or may not go back into production when those chassis are used up and he moves on to his more expensive and elaborate designs. It may be close to last chance to buy an amp of this caliber from Wyetech at "reasonable cost".