Perhaps when the ears are used instead of the eyes, the secrets of the KRELL can truly be realized.
"But the Krell forgot one thing! Monsters! Monsters from the id!" Subconscious minds acting out their darkest urges, fueled by the machine's power. The audiophile machine/merry-go-round fuels the subconscious mind to a point where the machine's power amplifies everything. Amplified by the machine, a mere "magic pebble" causes huge impact to the soundstage. One piece of wire sounds radically different from another! A farting flea can be heard across the continent.
And the amplified hubris of grown men inevitably draws them into heated arguments to defend the machines they worship!
"Don't you see, despite being civilized, this is what ended up destroying the Krell! All we have now are their machines"