What was the name of the Los Angeles studio where Metallica began recording The Black Album?

Metallica began recording The Black Album at One on One Recording Studios in Los Angeles.

The principal sessions started in October 1990 at One on One, where the band worked with producer Bob Rock. The studio is listed as the album’s recording location, and much of the record’s core work was completed there during an unusually intensive production period.

The group also spent about a week at Little Mountain Sound Studios in Vancouver, British Columbia. Additional overdubs and mixing later took place at A&M Studios in Hollywood, so One on One was the main starting point rather than the only facility associated with the album.

Sweet Silence Studios is a likely confusion because Metallica used it in Copenhagen for Master of Puppets. A&M Studios is also relevant to The Black Album, but mainly for later overdubs and mixing. Distinguishing the primary recording studio from later production locations makes One on One the specific answer.