How to Wire Metra Line Output Converter: Amplifier Integration
This is a free printable metra 2 channel line output converter diagram: download the diagram as SVG or open it and print to paper or PDF.
Two-channel line output converters extract audio signals for aftermarket amplifiers. This guide shows proper installation and configuration.
Metra line output converters extract preamplifier-level signals from factory speaker outputs, enabling integration of external amplifiers without head unit replacement. The converter uses precision analog circuits to reduce 20-50V speaker-level signals down to 0.2-0.5V line-level signals compatible with amplifier inputs. Separate channels for left and right audio enable proper stereo image and balance control. Differential circuitry rejects common-mode noise generated by alternators and ignition systems. Input impedance matching prevents loading of factory amplifier outputs. Capacitive input coupling blocks DC offset voltages that might damage downstream equipment. Gain control circuits allow level adjustment without modifying factory amplifier output levels. Output filtering removes high-frequency noise and RF interference. Ground isolation prevents ground loops that would cause hum in the audio output. Proper cable routing maintains separation between audio signal lines and power distribution. Shielded RCA cables prevent electromagnetic coupling of noise sources. Factory speaker output identification requires careful tracing using service documentation. Some vehicles use multiple amplifier stages requiring intermediate tapping points. Output impedance matching considers amplifier input characteristics. Frequency response remains flat across the audio spectrum with proper filtering. Transient response limits prevent distortion during dynamic musical peaks. Load resistance between output and amplifier input affects frequency response characteristics.
How to wire metra 2 channel line output converter diagram
- Disconnect the vehicle battery negative terminal
- Locate factory amplifier and identify speaker output connections
- Connect shielded cables to speaker outputs, securing with spade terminals
- Route Metra converter RCA outputs to amplifier input stage
- Connect converter power and ground near amplifier location
- Test audio output with engine running and verify proper levels
Frequently asked questions
Where should I tap speaker outputs on factory amplifiers?
At the amplifier output near the speaker connectors. This gives cleanest signal before speaker load impedance effects.
What is the proper output level adjustment?
Set amplifier gains so peak audio reaches 75-80% of clipping with maximum head unit volume. This provides headroom for dynamic peaks.
Can the Metra converter work with multiple aftermarket amplifiers?
Yes, but each amplifier needs separate channel connectivity or the converter output must split to multiple amps.
What causes hum in the audio output?
Ground loops from multiple grounding points. Use star-point grounding with single connection at vehicle chassis.
How do I identify factory speaker output wires?
They typically come as twisted pairs at the amplifier connector. Use a speaker signal tracer tool to verify output points.
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