The OP is asking specifically about that and mentions it by name!
Funk Firm
There’s another by Origin Live called the Enabler IIRC.
anyone know what is is?
Tonearm resonance
Always have had an issue with tonearm noise. I can't afford the the to spend a fortune on a turtable but I just love the sound of vinyl. I have an MMF 7.3 with the stock tonearm and ortofon bronze cartridge which I'm planning to upgrade to a Hana EL most likely. Anyway, I just saw Funk Firm decouplers online the other day and am curious as to whether it is effective or not. If anyone has had experience with it I would love to hear about it. Thanks