[1][2] In a review for AllMusic, Sean Westergaard wrote: "Frequency... draws from the well of 'Spiritual Jazz' that informed so many great Impulse recordings, but with an AACM sensibility....

Drawing equally from individual strengths without holding back inspiration, no matter how far out, this is a winning document of the finest creative jazz Chicago has to offer.

"[4] The Chicago Reader's Peter Margasak stated: "The flute's soft timbre often leads to ruminative, spacious exercises...

West of Jazz Times wrote: "The many woodwinds of frontline partner and de facto leader Edward Wilkerson might have overwhelmed a lesser musician, but Mitchell's is the most penetrating, distinctive sound on this quartet disc.... this is some of the flutist's best playing on record.

However, at their most cohesive they present a meditative and spiritual approach not dissimilar in intent to the early 70's work of Alice Coltrane and Pharoah Sanders.