George manufactures the Lightspeed Attenuator. One of the the best bargains in audio. I have owned one for 10 years it seems. My old friend Pubul57 (RIP) started this thread years ago to discuss the Lightspeed:
https://forum.audiogon.com/discussions/lightspeed-attenuator-best-preamp-ever?highlight=lightspeed%2...
https://forum.audiogon.com/discussions/lightspeed-attenuator-best-preamp-ever?highlight=lightspeed%2...