The Grateful Dead have announced details of a new box set, Spring 1990 (The Other One).

The release is a companion to the sold-out Spring 1990 boxed set from 2012.

The 23-disc set covers eight complete shows, all previously unreleased, and will be available from September 9.

The collection will be limited to 9,000 individually numbered copies and is currently available for pre-order exclusively from the band’s website, Dead.net.

It will also be released as an HD digital download on the same date.

In addition to its inclusion in the boxed set, a March 29, 1990 show at Nassau Coliseum with Branford Marsalis will also be released separately as a three-disc set.

“When we produced the first Spring 1990 box in 2012, there were a lot of tough choices to make about what shows to omit from that box. However, we knew we’d do this second box someday, so the choices of omission were easier to digest,” says Grateful Dead archivist David Lemieux. “Now we’re able to complete the picture the first box painted with music that’s every bit as good, and in some cases surpasses, the six shows in the original box. These are eight extremely high-level Dead shows, each and every one of which would make a terrific CD releases. It only seemed fitting that in the face of such an abundance of quality Dead, we should release it all at once.”