Ultimate Abyss is the fourth EP by Sphere Lazza, released on January 1, 2005, by AcidVictim Records.

Brutal Resonance called Ultimate Abyss "very interesting" and that "Trousdale have occasionally a really great voice with a style you don't hear that often in the EBM-genre.

said "you get an even better sense of just how good Trousdale's vocals are for the material, and how good the material is when compared with a lot of drek you find out there these days.

"[2] Funprox called the music "good for the dance-floors as well" and "with this single Sphere Lazza gives a new sign of life.

"[3] All tracks are written by Tony Spaz and David TrousdaleAdapted from the Ultimate Abyss liner notes.