Synergistic Research PHT - Phono Transducer 2Pack Handmade in California. Transform your turntables performance dramatically with Synergistic Research PHT! PHT (pronounced POT) is an acronym for "Phono Transducer" and is an evolution of SRs award winning UEF technology. To get started simply apply 1 micro PHT transducer, Black Widow or Green Dream, to the top of your phono cartridge or head-shell for an immediate and dramatic transformation. Improvements include a lower nose floor, increased resolution, improved bass extension with increased air, and sound staging. Owning Black Widow or Green Dream PHTs its like having two high level state-of-the-art cartridges for the cost of a good stylus pressure gauge! PHT Versions are limited and when sold out, theyre sold out.