As I said on your other preamp thread.
Halo A23 and the A21 they only need 1v in!! for them to give their max wattage output. And most sources today give more than 2v output some even 4v and 6v!!!
So you need a preamp with next to NO gain, or go direct from the source if it has a volume control.
And you can send it back after a good listen if you don't get off on it.
For preamps that have low gain look at the Schiit FreyaS with remote control!! and balanced, at $599 it gives you the choice of being used as passive, active tube or active solid state.
https://www.schiit.com/products
Cheers George