Orion OLH28C Manual

2 channel high to low converter

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Using the OLH28C for Low Level RCA Installation with a Factory Radio

To use the OLH28C for adding an ampliﬁer to a factory radio, begin by carefully preparing the wiring connections to

ensure optimal performance and functionality.

First, identify the right speaker output from the factory radio. Connect the Gray (+) wire from the OLH28C to the

positive terminal of the right speaker output. Next, connect the Gray/Black stripe (-) wire from the OLH28C to the

negative terminal of the right speaker output. It is crucial to ensure these connections are secure to prevent any

signal loss or distortion.

Similarly, for the left speaker output, connect the White (+) wire from the OLH28C to the positive terminal of the left

speaker output, and the White/Black stripe (-) wire to the negative terminal of the left speaker output. Double-check

these connections for stability and accuracy, as any loose or incorrect wiring can result in poor audio quality or mal-

functioning of the system.

In cases where the factory radio's speaker outputs share a single negative lead for both left and right channels,

connect both the Gray/Black stripe (-) and White/Black stripe (-) wires from the OLH28C to this single negative

lead. This ensures that the OLH28C can correctly interpret and process the audio signals from the radio, allowing

for proper operation of the ampliﬁer.

After the speaker connections are established, the next step is to provide the OLH28C with the necessary power.

Connect the Red wire from the OLH28C to a constant 12-volt positive power source. This power connection is essen-

tial for the OLH28C to function and convert the speaker level signals into low-level RCA outputs for the ampliﬁer.

Ensure that the power source is stable and capable of delivering a consistent 12-volt supply.

Then, connect the Black wire from the OLH28C to a suitable chassis ground point. The chassis ground is critical for

eliminating noise and ensuring a clean signal transfer. Make sure the ground connection is secure and attached to

a bare metal surface on the vehicle's chassis for optimal grounding.

Additionally, connect the Blue wire from the OLH28C to the remote turn-on lead of the ampliﬁer. This connection

enables the OLH28C to control the ampliﬁer's power state, turning it on and off in sync with the radio. This ensures

that the ampliﬁer only operates when necessary, helping to conserve battery power and reducing unnecessary

strain on the vehicle's electrical system.

O LH28C

2 CHANNEL HIGH TO LOW CONVERTER

ADJUSTABLE INPUT SENSITIVITY

Page 1

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Page 1 Similarly, for the left speaker output, connect the White (+) wire from the OLH28C to the positive terminal of the left speaker output, and the White/Black stripe (-) wire to the negative terminal of the left speaker output. Double-check these connections for stability and accuracy, as any loose or incorrect wiring can result in poor audio quality or mal- functioning of the system.
Page 2 ADJUSTABLE INPUT SENSITIVITY Once all the connections are made, the OLH28C needs to be adjusted to match the output levels of the factory radio. Start by setting the radio’s volume to approximately two-thirds of its maximum level. This setting is typically ideal for making adjustments, as it represents a moderate listening volume without pushing the system to its limits.