Alesis RA150 User Manual - Page 15
RA150 Back Panel, RA300 Back Panel, RA500 Back Panel
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INPUTS INPUT JACK CHARACTERISTICS The RA150/300/500 include two balanced, 1/4" TRS (tip-ring-sleeve, 3-conductor) phone jack inputs, and unbalanced RCA/phono inputs. The RA300 and RA500 feature combination XLR input jacks as well. The inputs are wired according to IEC standards, as shown in the table below. Connection Audio Ground High (+) Low (-) RA150 Back Panel XLR Pin 1 Pin 2 Pin 3 Chapter 2: Connections These are compatible with the low-impedance, unbalanced or balanced, line-level outputs typically emanating from equipment such as mixers, synthesizers, samplers, direct boxes, crossovers, etc. Electric guitars, microphones, and other lowlevel/high-impedance output devices require a preamp. Phone Jack Sleeve Tip Ring RCA/phono jack Shell Pin -- RA300 Back Panel RA500 Back Panel RA150/300/500 Reference Manual 13