How's this different than an EQ pedal?
I haven't played one yet, but the immediate difference I noticed from James 5150 video, was how it reminded me of the tonal differences between an original and modded 5150.
I was looking into modded 5150's (like Voodoo etc..) and the tonal differences appeared to be the high end fizz being removed, and what some call 'warmth / clarity' mods.
IMO, the EQ curve in the Defizzorator isn't much different tonally. Obviously it's not exact, and you haven't upgraded any parts. It's just the impression I got.
It's interesting to say the least, and worth $60 by far.
It is a simple EQ....but it's passive so you don't need batteries, AND it doesn't add noise. I used low impedance values since that would work fine in the loop or after any buffers etc, and not pickup hum/noise as much, and not add noise with electronics of a regular EQ. It only cuts the very high, highs at 3 frequencies I set on there. The Fizz one is really high and only noticeable if your speakers can reproduce that high.....which is the whole problem. Most speakers that sound great clean go way up there, and then the fuzziness from distortion sounds like crap. This can fix that.
The 5150 does have a lot of sizzle-ey highs, and part of that was Eddie liked how it cleaned up....he didn't play it at low volumes, and at high master volume settings that sizzle gets clipped away by the power amp rails. So you don't hear it nearly as much, UNTIL you turn the guitar down, which he does all the time and doesn't want it to sound muddy in any way. But of course then it's very fizzy at low volumes. The DeFizzerator fixes that, and you could accomplish it all kinds of ways in the amp, but this is a simple plug in pedal you can just patch in without shipping your amp around.