I have one of those shared fan made Q4 transfers. It has a pronounced tape bass bump and high end attenuation. Head alignment could have been more fussed over IMHO. I can't remember if it also has an unwelcome 10k-ish treble boost. ("Hulk smash!" style. It's muddy... turn up the treble!!!) That would have made it high end attenuated but then with a 10k shrill on top.
Anyway, I re-balanced it. Possibly referencing the stereo mix? Can't remember. There was still a lot of sound in there and it cleaned up well I thought. This is my favorite version now.
I have to agree with Ssully's review all the same!
But it's worth tinkering with that Q4 transfer. The album is still in there!
Want to make Machine Head sound like an audiophile dream come true and not notice a single thing wrong with it? Listen to In Rock and Fireball first! Albums I like more than Machine Head BTW but the low budget distorted to high hell sound has to be heard to be believed. There ARE stereo remixes of these too but they have that sanitized vibe.
All these albums still make me happy and never get old.