So, I have to be a drummer, I have to be a bass player, I have to be like a multi-instrumentalist, only using the piano.”[7] Jon Regen of Keyboard Magazine said "Ten years after the release of her solo piano debut, Place to Be in 2009, Hiromi goes it alone once again on Spectrum.

The album celebrates the maturity and depth that have enriched her music in recent years, during her collaborations with artists like Chick Corea, Stanley Clarke and Michel Camilo.

"[8] Thom Jurek of AllMusic commented "This 75-minute recital portrays the nearly spiritual command Hiromi has of her instrument and its various languages to extend her astonishing technical facility.

[1] Jim Worsley of All About Jazz stated "Remarkable in its scope and vivid in its illustration, Spectrum once again personifies the brilliantly gifted pianist's extraordinary skill set.

"[2] Writing for DownBeat, Phillip Lutz commented, "Few pianists exploit the potential of their instruments with the range of skill and emotion that Hiromi has at her disposal.