Rig Rundown: Dinosaur Jr.’s J Mascis and Lou Barlow 
One of rock’s loudest guitar-and-bass duos catalogs their ferocious setups.
Mascis’ four-amp setup includes two late-’60s Marshall Super Bass full-stacks, a vintage Hiwatt DR-103 head driving two Marshall 4x12s, and a Fender Twin Reverb (offstage, left). All the amps are blowing and going—so Dinosaur Jr. shows are not for the faint of heart.
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