Chris A
Senior Member
I find it interesting that you picked something that is a "modulation distortion generator" ("IMD") as the sole discriminator among loudspeakers (...To really separate the good systems from the poor - pretty much anything non-acoustic by Led Zeppelin. Funny enough you very rarely get any of that played at shows.
The problem I find with Led Zeppelin albums is that the period microphones and analog tape recorders that were used for their production quickly reveal their limitations. [I own the Led Zeppelin albums (CDs) but I don't generally listen to them because of this.] If you move forward to ~1982 when digital recorders and better microphones began to be used widely, I find that I no longer find myself listening to the problems in the recordings themselves--especially with this genre of music.
You could probably list anything that has thick harmonic content combined with heavy kick drum transients and the tendency for listeners to play the recordings well above 83 dB at the listening position (i.e., the average loudness level used by most mastering guys).
Chris