Chryalis recording artist Robin Trower will be carrying the largest pulic address system ever made for the durtion of U.S. tour which begins next week.  The record shattering unit was custom built for the British guitarist  by Electrsound Productions in London. Such is the size and capacity of the of the system that it will be "hung" in each concert hall by two specilly built cradles, each capable of holding seven tons and lown by electrc star pulleys.
 Trowr's power system is five way system covering the full audio spectrum of high fidelity.  It is comprised of 114 seperate JBL and GUASS speakers and is powered by 36 Crown amplifiers. Part and parcel of the equipement is a desk console replete with a 24- channel mixer unit, studio compressor limiters and switchable frequency electronic crossovers. The monitor system was likewise custom-built and constructed for Trower. Total weight for the complete sound unit is 16 tons; the system requires no less than four miles of wiring to become operational, and the road crew will spend nine hours assembling the system.
  Trower's powerful P.A. is being specailly flown from England in a chartered TWA 707 jet and will be trucked to each of Trower's twenty-odd concert dates by Clark Transfer in two 45-foot Air Ride Artics.