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Appendix C
Procedure for Powered Radios
Using the EQX/EQL with head units with internal power amplifiers isn’t all that difficult.
1. Determine whether the output is floating or grounded. Use an ohmmeter on both output wires
(hot and ground) from each channel to the negative power connection. If the output is
grounded, you will read a very low resistance (less than 1 ohm) between one of the output
wires and the power supply negative lead.
2. If the output is floating, select the two wires that would have gone to the + terminals of the
speakers. Insulate and store the other wires.
3. Connect the output wires to individual RCA plugs. Connect the shell of each RCA plug to the
negative power supply wire. Twist the wires going to the RCA plugs. If the wires must be
more than 1 foot long, splice them into shielded cables with RCA plugs attached. The shield of
the cable goes to the negative power supply wire.
4. Set the power amplifier for .8V to 1V (800 mV to 1000 mV) sensitivity. If the amplifier isn’t
marked, and it’s rated sensitivity is somewhere near 250 mV to 1.5V, then set the input level
control to about 10 o’clock.
5. Set the OUTPUT LEVEL control on the EQX/EQL to the 12 o’clock setting.
6. Set the INPUT LEVEL control on the EQX/EQL to its minimum setting.
7. Using an FM radio station, a loud cassette, or a Compact Disc, adjust the volume control on
the head unit until you hear distortion. This should be the point at which the head unit’s power
amplifier distorts. Reduce the volume control setting slightly.
8. Advance the setting of the EQX/EQL INPUT LEVEL control until the system is either too
loud, or the amplifiers reach clipping, whichever happens first. If the 3 dB HEADROOM
INDICATOR flashes, reduce the setting of the INPUT LEVEL controls slightly. Both controls
should have equal settings.
9. If you have an EQX, disregard the remainder of this procedure and use the final setup proce-
dure for the EQX that was described previously.
10. If the amplifiers are not clipping (and the system isn’t loud enough), increase the settings of
the OUTPUT LEVEL controls on the EQL until the amplifiers clip or the system is too loud.
11. Set the EQ IN/OUT switch to the IN position. Now that you have matched levels, you can
begin the equalization process.
Appendix C