| Joyrex J9i | |
| Type: | ep |
| Artist: | Caustic Window |
| Cover: | Joyrex_j9i.jpg |
| Released: | 1993 |
| Genre: | Acid house |
| Length: | 11:42 |
| Label: | Rephlex Records |
| Chronology: | Richard D. James |
| Prev Title: | Quoth |
| Prev Year: | 1993 |
| Next Title: | Joyrex J9ii |
| Next Year: | 1993 |
Joyrex J9i is a single by Richard D. James under the alias Caustic Window. The release is a 10 inch vinyl and was limited to an edition of 300 copies. The title of this release is very similar to another Caustic Window release titled Joyrex J9ii.
Joyrex J9i is a limited edition picture disc, featuring a picture of a Roland TB-303 synthesizer on Side A, and a picture of a Roland TR-606 drum machine on Side B. Hand-etched just inside the run-out groove on Side A are the words "THE ACID THAT FELL TO EARTH."
Both tracks were later re-released on the album Compilation.