A special auction that centers around items associated with the Grateful Dead’s famed Wall of Sound will close later this afternoon. The Wall debuted on March 23, 1974 during “The Sound Test” which took place at the Cow Palace just outside San Francisco. At its peak, over 600 speakers were part of the system, which weighed 75 tons. Bidding is currently live for the 30 lots in Wall of Sound: A Living History of the Grateful Dead, which will close starting at 5:00 PM ET.

The Wall of Sound-specific items include a 1971 McIntosh MC 2300 amplifier in its original vintage case that Bill Kreutzmann used to climb up to his drum riser. A second lot features an open-back JBL guitar speaker cabinet that Jerry Garcia gifted to Monroe Grisman at The Club Front in San Rafael, CA, accompanied by a provenance letter from Grisman. Also available is a pair of Hard Truckers stage monitors, which include 10″ JBL speakers alongside EV tweeter horns pulled directly from the center cluster of the Wall of Sound (and evidence suggests they later traveled with Dead to Egypt in 1978). Another notable item is a photograph of the 1974 Wall of Sound at the Hollywood Bowl signed by Owsley “Bear” Stanley.

The auction also features a 1967 Fender Twin Reverb amplifier owned and used by Jerry Garcia at the 1968 Newport Pop Festival. Two other lots present pieces of original art created and signed by Stanley Mouse. In addition, Wall of Sound: A Living History of the Grateful Dead includes a Bill Kreutzmann Zildjian crash cymbal from the estate of crew chief “Ram Rod” Shurtliff.

The auction will begin to wrap up, lot by lot, at 5:00 PM ET.