An underground chemist, acid-soaked sound engineers, a bestselling author, and a psychedelic band all set out together in the 1970s in pursuit of audio perfection. Together, they created and destroyed a legendary sound system known as the Wall of Sound, which was as tall as a school bus is long and more than a hundred feet wide.

Author Brian Anderson explores this wild journey in his new book Loud and Clear: The Grateful Dead’s Wall of Sound and the Quest for Audio Perfection.

And oh yeah, they hid all kinds of secret compartments in the speakers so they could smuggle their own homegrown Cali weed from show to show.

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LSD Fueled the Grateful Dead's 'Wall of Sound'