Monolith HTP-1https://www.monoprice.com/product?p_id=37887
Out of stock
Audio Control Maestro X7 .
https://www.audiocontrol.com/home-audio/immersive-av-preamp-processors/maestro-x7/
If you can find one on the used market .
Out of stock
Audio Control Maestro X7 .
https://www.audiocontrol.com/home-audio/immersive-av-preamp-processors/maestro-x7/
If you can find one on the used market .