October 2026 Issue
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THE GRAMMATICO SONOROUS SERIES CABLES

Just Tell It Like It Is

By Riverhorse · Vol. 27, No. 12 · October 2026

John Grammatico’s pursuit of sound has taken him from high-end audio and amplifier building to a place few guitarists think to look—the power cable. Here, John traces the listening, experimentation and small refinements that led to four Sonorus cables, each voiced around different eras of Fender, Marshall and Dumble-inspired tone. Riverhorse then puts them to work with familiar amps, guitars and a stock IEC cable for comparison, discovering audible differences in body, warmth, clarity, response and gain that challenge assumptions about where tone begins.

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Just Tell It Like It Is — The ToneQuest Report®