Installation Guide

Page 2
Speaker Level Input to Speaker Level Output
Speaker level input to speaker level output is most commonly used when replacing an OEM radio and retaining the factory installed ampliers.
Use this when you need to match levels from a source that only has speaker level outputs and an amplier with speaker level inputs. The RCA input
connectors on the main harness will be used for this type of installation, we suggest cutting them off the harness 6 inches from the RCA end so they
can be used for wired speaker level output. After all the connections are made, skip to the level adjustment section of this manual.
Cut RCA in half from main harness. Then connect to ouputs of L.O.C to provide wired speaker lead outputs.
Level Adjustment
New School –
Required items: Digital Multi-Meter, Test track media @ 1kHz and 100Hz. Max Amplier Line-level Input Voltage Specication
(i.e., 4vrms, 8vrms, etc.)
Proper level adjustment is crucial for obtaining the best possible sound quality. Following the guidelines below will enable you to properly set the
output gain of the LP6-4 using equipment that is readily available. Although this device can be set by ear (Old School), we recommend using a multi-
meter and test tracks for pinpoint accuracy and the least chance of noise.
Ampliers usually have 2, 4 or 8v max line-level input ratings but this can vary. This max line-level input will be your target setting you will read on the
multi-meter. Perform the following procedure for each amplier you are installing.
Old School –
1. Start with gain adjustment levels on LP6-4 and ampliers set to minimum.
2. Turn source unit to ¾ maximum volume and play a familiar song that has dynamic attributes.
For example, if your volume goes to 40 you will turn it up to 30 and play a song that has some
quiet sections and some really loud sections.
3. Slowly adjust front channel gain of LP6-4 until just a hint of distortion is audible, and then
back down gain just under that threshold and the distortion goes away. (gure 2)
4. Repeat steps 1-3 for rear channels.
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Figure 2
Example:
Amplier 1 (Mid/High frequency) has a maximum 4v input voltage, so you will be targeting a 4
volt output voltage from the LP6-4.
Amplier 2 (Sub frequency) has a maximum 2v input voltage, so you will be targeting a 2 volt
output voltage from the LP6-4.
1. Start with gain adjustment levels on LP6-4 and ampliers set to minimum.
2. Turn source unit to ¾ maximum volume and start test track
(1kHz for mid/high or full range, 100Hz for sub).
3. Choose either left or right channel - With multi-meter, test output of LP6-4 front
channels. Probe with negative on RCA shield and positive in center of RCA output. (gure 1)
4. Slowly adjust level on LP6-4 until you reach the target voltage of the amplier. (gure 2)
5. Repeat steps for rear channels
(if connecting to a different amplier, adjust to that amplier’s voltage requirements)
6. Turn volume down and system off.
7. Connect RCAs, set gains on ampliers to minimum
8. Turn system on and ne tune gains of amplier (if needed).
Figure 1
Set meter to AC voltage.
Connect Red probe to Voltage (V)
Black to Common (COM)
3"
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Front Right Audio Input
Rear Le Audio Input
Rear Right Audio Input
Front Le Audio Input
Audio Ground Input -
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Front Le Output
Front Right Output
Rear Le Output
Rear Right Output
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OPTIONAL
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