Haven't heard of LFF.
With the fuzzor style mods, I've do many tests in the past. The best is the sheep's wool felt. It's in my opinion the most natural sounding. The sheep's wool felt work brilliant in the original HD800 over the metal ring.
With the fuzzor style mods, I've do many tests in the past. The best is the sheep's wool felt. It's in my opinion the most natural sounding. The sheep's wool felt work brilliant in the original HD800 over the metal ring.