INPUT SIGNAL (Choosing the High or Low Inputs)
The RTA amplifer control panel input signal connects to the head unit’s High Level (speaker wire)
output OR Low Level (RCA) output—provided the radio is so equipped with Line Out. A dedicated
subwoofer or low level signal will deliver the best performance. If unavailable use the high level
inputs, as will be the case with most factory head units. (Note once you have chosen whether
you will use the High Level or Low Level inputs follow the corresponding wiring diagrams on the
following pages)
NOTE:
Never use BOTH High and Low Level inputs at the same time. You must select one or the
other!
High Level Input Connections
(fig 4)
For radios with only speaker outputs (including most Factory source units). Using the 4-pin Molex
style wiring harness provided, splice directly into the radio’s speaker outputs. Do not break the
connection with the source (radio) and the speakers. Be sure to maintain proper speaker polarity.
Another option is to tap off the existing front or rear full range speakers. Once again be sure to
follow the correct polarity
Wire Color
Connect to
Red
Black
Red
Black
Left +
Left -
Right +
Right -