Adam Yauch

The official Spector site states that Yauch owned a Spector NS2 on its artist page.

Used in a few concerts in the "Check Your Head" Era.

In this photo, Yauch can be seen with an Ampeg AEB-1.

MCA playing an Arctic White P Bass while Ad-Rock plays drums (Circa: Check Your Head era)

MCA Strumming his 60's Jazz bass

In this pic, MCA is in front of an Ampeg SVT with a see through grille.

Used in the Gratitude music video

Yauch's bass tone on Sabotage manages to be huge without being so overtly driven or drenched in gain. To achieve his signature bass tone, producer Mario Caldato Jr. explains that Yauch played a 60's Fender Jazz bass through an Acoustic 270 Graphic EQ head. The amp was put into an isolated sound proofed case when recorded, with the bass running through a Black Cat Superfuzz pedal. The Black Cat Superfuzz is modeled after the highly coveted 70's Japanese made Univox Superfuzz. What was special about those Univox Superfuzzes was their "two stage octave doubling circuit." From the Black Cat site: "beneath the massive torrent of fuzz is a hint of upper octave; not quite as prominent as an Octavia, but definitely noticeable." That double octave is what helped Yauch achieve such a massive sound on the record.