So what is the website of your shop?
These are about as close as the "Lightspeed Attenuator" gets to being a shop
https://forum.audiogon.com/topics/amps-preamps?tab=alltime
https://www.diyaudio.com/forums/analog-line-level/80194-lightspeed-attenuator-passive-preamp.html
If you need info send me a PM with your email address
Cheers George