Are there passive attenuators that don't zero volume and only offer one input ?

Can't do it, because you are him!!!!

 
I am happy to ignore that reason, as  it has absolutely no relevance at all, relating to what customers want from passive attenuators.

We each know LDR passives offer so much better audio than other attenuation methods, and the task ahead is to make LDR passives the number one choice, as nothing else, can do what they do. 

The good news is each issue, namely more inputs and silence  are relatively easy to do.   I am very sure your customers will welcome those new features, and thank you,  for caring about their needs.,

on a wider perspective ... it will see see all other passives, .. eating dust.

±0.1VDC 1mVDC ripple is hardly anything to sneeze at.
Thyristors make gawdawful noise when switching. Pointless to control current in a device using a few mA.
Quit digging.

Let him go ieales, never have I met such a persistent BS'er as him, for years now on many forums trying to make a quick buck from the gullible, he’ll self implode one day.

Cheers George

I don't recognize any of the model numbers nor the technologies, but you guys seem to know a lot about passives. I have never tried a passive preamp, but i have been researching a Townsend Allegri Reference passive preamp to replace my massive two box ARC REF10 solution. Are I in the same ball park of Passives? Can anyone tie the more technical part of the discussion to if the Townsend Allegri REF to see if it might work in my system as a passive. All I run is a DAK/Streamer to monos and onto my Wilson speakers I'm digital as the only input, no balance control needed, nor  TT or other inputs needed, I just need balanced output, a volume control and a remote control. Any advice for a newbe from the Passive camp as I'm just seeing If there room for my questions and ideas.