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Chapter 2: Connections
RA150/300/500 Reference Manual 13
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.
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 low-
level/high-impedance output devices require a
preamp.
Connection XLR Phone Jack RCA/phono jack
Audio Ground Pin 1 Sleeve Shell
High (+) Pin 2 Tip Pin
Low (–) Pin 3 Ring --
RA150 Back Panel
RA300 Back Panel
RA500 Back Panel