New Synergistic Research Record Mat

testpilot, SR and their customers are credulous.  Their claims are incredible.

https://www.synergisticresearch.com/accessories/turntable/pht/

this is my favorite

i have bought some and taped them each ear's tragus... ALL music sounds better now  🤣

Yes, the PHT. My fave, too.  But some persons whom I respect do swear by them. It, first of all, hinges on whether crystals can effect a reverse piezo-electric effect, by absorbing RFI and turning it into heat.  The second question is why would there be a particular concentration of RFI anywhere near to the cartridge proper.  The third question is can the necessarily very tiny crystal inside a PHT do this in sufficient magnitude to be heard.  The fourth is why should color of the crystal change the sonic signature of the end effect.

Yea, but it makes your cartridge sound like it cost thousands more.........Hey! They said so!
BillWojo

Just go to show, you can fool some of the people all of the time.