I have a 1st gen Bent TVC with S&B transformers. It's an excellent performer with stellar imaging and transparency. I had a Promitheus about a year ago. Everything about the Bent is better. The Promitheus had a buzz I could never get rid of. The Bent has a better ground design. There's a switch for each channel allowing you to float or ground the output jacks. The Bent also switches positive and negative inputs when the source is changed. This prevents crosstalk and eliminates any ground issues. The Promitheus and Sonic Euphoria have a common ground for inputs which can lead to problems.
Bent just released a new passive using autoformers. I heard it about a month ago and was impressed. In my opinion, autoformers have more bloom than TVCs. TVC's often sound thin in the midbass region. If you do the comparison, you'll know what I mean.
In my experience, the Sonic Euphoria was better sounding than the Promitheus. It had significantly better bass. It also uses autoformers.
FWIW, I think the money you put into a passive would be better spent on your goal of getting an RWA integrated.
Bent just released a new passive using autoformers. I heard it about a month ago and was impressed. In my opinion, autoformers have more bloom than TVCs. TVC's often sound thin in the midbass region. If you do the comparison, you'll know what I mean.
In my experience, the Sonic Euphoria was better sounding than the Promitheus. It had significantly better bass. It also uses autoformers.
FWIW, I think the money you put into a passive would be better spent on your goal of getting an RWA integrated.