instruction metra line output converter wiring diagram
Article Plan: Metra Line Output Converter Wiring Diagram
This guide details installing Metra LOCs (OY-AJLO, ALOC60, LLC1), converting speaker signals for amplifier addition, and troubleshooting common wiring issues for optimal car audio performance.
Line Output Converters (LOCs) bridge the gap between factory stereos and aftermarket amplifiers, enabling signal conversion for enhanced audio systems within vehicles, like those from Metra.
What is a Line Output Converter (LOC)?
A Line Output Converter (LOC) is a crucial component when integrating aftermarket audio amplifiers with factory car stereos that lack RCA outputs. Essentially, it transforms high-level speaker signals – the fluctuating voltage sent to speakers – into low-level RCA signals, which are the standard input for most amplifiers.
This conversion is necessary because amplifiers are designed to work with the lower voltage and impedance of line-level signals. Without an LOC, the amplifier might not function correctly, or could even be damaged. Metra LOCs, like the OY-AJLO and ALOC60, facilitate this essential signal adaptation process.
Why Use a Metra LOC?
Metra Line Output Converters (LOCs) offer a reliable solution for upgrading your vehicle’s audio system without replacing the factory head unit. They bridge the gap between your car’s existing stereo and a powerful aftermarket amplifier, enabling enhanced sound quality and volume.
Metra LOCs are known for their ease of installation and adjustable settings, allowing for optimized signal matching. Utilizing a Metra LOC avoids cutting factory wiring, preserving the original system’s functionality and simplifying future upgrades. They are a cost-effective way to significantly improve your in-car audio experience.
Common Metra LOC Models (OY-AJLO, ALOC60, LLC1)
Metra offers several LOC models catering to diverse needs. The OY-AJLO is an adjustable LOC, providing flexibility in signal level matching. The ALOC60 is a popular 2-channel converter known for its straightforward installation and reliable performance. Lastly, the LLC1 is a 2-channel adjustable LOC with a built-in amplifier remote turn-on, simplifying wiring.
Each model offers unique features, but all are designed to convert high-level speaker outputs to low-level RCA outputs, compatible with most aftermarket amplifiers. Choosing the right model depends on your vehicle and amplifier setup.
Understanding Speaker Level vs. Line Level Signals
Speaker-level signals are high voltage/low impedance, while line-level signals are low voltage/high impedance. Conversion is crucial when adding amplifiers to factory systems.
Differences in Voltage and Impedance
Speaker-level outputs from a car’s stereo typically range from 10-30 volts AC, designed to drive the low impedance (2-8 ohms) of speakers directly. Conversely, line-level signals, intended for input to amplifiers, operate at a much lower voltage – around 0.2-2 volts RMS – and a higher impedance (typically 10k ohms).
This impedance mismatch is why a direct connection isn’t feasible. A Line Output Converter (LOC) bridges this gap, reducing the voltage and adjusting the impedance to a level compatible with aftermarket amplifiers, ensuring optimal signal transfer and preventing damage to the amplifier’s input stage.
The Need for Conversion When Adding Amplifiers
Most factory car stereos lack RCA outputs needed for connecting aftermarket amplifiers. They utilize speaker-level outputs. Directly connecting these speaker wires to an amplifier can result in poor audio quality, distortion, and potential damage to the amplifier due to the high voltage and low impedance.
A Line Output Converter (LOC) is therefore essential. It transforms the high-level speaker signals into low-level RCA signals, providing a clean and compatible input for the amplifier, unlocking its full potential and delivering a superior listening experience.
Metra LOC Wiring Basics
Proper installation requires identifying vehicle speaker wires, gathering essential tools like wire strippers and connectors, and understanding grounding techniques for a clean signal.
Identifying Vehicle Speaker Wires
Locating your vehicle’s speaker wires is crucial for successful LOC installation. Often, factory wiring harnesses utilize color coding, but this varies significantly between manufacturers and model years. Consulting a vehicle-specific wiring diagram is highly recommended; these are frequently available online or through car audio retailers.
Alternatively, a multimeter can be used to identify speaker wires by probing each wire while playing audio. Positive wires will show fluctuating voltage, while negative wires will show an inverse signal. Remember to exercise caution and avoid damaging the factory wiring during this process. Accurate identification prevents incorrect connections and potential damage.
Essential Wiring Tools and Materials
Proper tools ensure a clean and reliable installation. You’ll need wire strippers, crimpers, and a multimeter for testing connections. A wire tester verifies continuity and identifies shorts. Essential materials include appropriately sized speaker wire, RCA cables, heat shrink tubing for insulation, and zip ties for cable management.
A soldering iron and solder are beneficial for secure connections, though crimp connectors are acceptable. Don’t forget a distribution block if connecting multiple amplifiers. Always prioritize quality materials to minimize signal loss and maximize system performance and longevity.
Detailed Wiring Diagram for Metra OY-AJLO
The OY-AJLO converts speaker outputs to RCA. Connect vehicle speaker wires to the LOC input, and RCA cables to your amplifier for signal transmission.
Input Connections (Speaker Wires)
Identifying the correct speaker wires is crucial. Typically, these are found behind your car’s head unit or at the speaker connections themselves. Use a wiring diagram specific to your vehicle to ensure accurate identification of positive and negative terminals.
Connect the vehicle’s left and right front/rear speaker wires to the corresponding input terminals on the Metra OY-AJLO. Pay close attention to polarity – matching positive to positive and negative to negative – to maintain proper phase and sound quality. Secure connections using crimp connectors or solder for a reliable signal path.
Output Connections (RCA Cables)
The Metra LOC converts the speaker-level inputs into RCA outputs, compatible with most aftermarket amplifiers. Connect high-quality RCA cables from the LOC’s RCA outputs to the corresponding inputs on your amplifier – left and right channels.
Ensure a snug fit for both connections to minimize signal loss and interference. Shielded RCA cables are recommended to further reduce noise. Double-check all connections before powering on the system to prevent potential damage to your amplifier or LOC.
Remote Turn-On Wire Connection
The remote turn-on wire is crucial for activating your amplifier when the vehicle’s head unit powers on. Locate the remote wire (often blue) from your head unit or the LOC itself, if equipped. Connect this wire to the amplifier’s remote turn-on terminal.
This ensures the amplifier only receives power when the head unit is active, preventing pops and potential damage. Secure the connection with a wire connector and insulate it properly to avoid shorts. Proper remote wire connection is vital for seamless operation.
Detailed Wiring Diagram for Metra ALOC60
The ALOC60 connects to speaker outputs or head unit outputs, converting them to RCA for amplifiers, requiring careful grounding for optimal performance and noise reduction.
Identifying the correct speaker wires is crucial. Typically, these are found behind your car’s head unit or at the speaker connections themselves. Use a wiring diagram specific to your vehicle to ensure accurate identification of positive and negative leads.
Connect the vehicle’s speaker wires to the corresponding input terminals on the Metra ALOC60. Pay close attention to polarity – matching positive to positive and negative to negative – to maintain proper phase and sound quality. Incorrect wiring can result in diminished bass response or audio cancellation. Secure connections are vital; use crimp connectors or solder for reliable contact.
The Metra LOC converts speaker-level signals to RCA outputs, compatible with most aftermarket amplifiers. Connect high-quality RCA cables from the LOC’s RCA outputs to the corresponding inputs on your amplifier. Ensure a snug fit to prevent signal loss or interference.
Shielded RCA cables are recommended to minimize noise. Route the RCA cables away from power wires to avoid picking up alternator whine or other electrical interference. Proper RCA cable management contributes significantly to a clean and powerful audio signal, enhancing the overall listening experience.
Grounding Instructions
Proper grounding is crucial for optimal performance and noise reduction. Connect the LOC’s ground wire to a clean, unpainted metal surface on the vehicle’s chassis, as close to the LOC as possible. Ensure solid metal-to-metal contact; sanding away paint may be necessary.
A poor ground connection can introduce noise and distortion. Avoid grounding to components that move or are already grounded by other devices. Secure the ground wire firmly with a screw and ring terminal, verifying a stable connection before powering up the system.
Detailed Wiring Diagram for Metra LLC1
The LLC1 converter features speaker wire inputs, RCA outputs, and gain adjustments. Careful wiring and gain settings are essential for clean, amplified audio output.
Identifying the correct speaker wires is crucial. Typically, these are found behind your car’s head unit or at the speaker connections themselves. Use a wiring diagram specific to your vehicle to ensure accurate identification. Connect the positive (+) and negative (-) speaker wires from your vehicle’s stereo to the corresponding terminals on the Metra LLC1.
Pay close attention to polarity; incorrect wiring can result in phase cancellation and poor sound quality. If your vehicle has factory amplified systems, tap into the speaker wires after the amplifier to receive a signal strong enough for conversion. Secure connections using crimp connectors or solder for a reliable signal path.
The RCA outputs on the Metra LOC deliver the converted line-level signal to your amplifier. Connect high-quality RCA cables from the LOC’s RCA outputs to the corresponding inputs on your amplifier. Ensure a snug fit to prevent signal loss or interference.
Use shielded RCA cables to minimize noise and maintain signal clarity. If using a mono amplifier, connect the left and right RCA outputs from the LOC to a Y-splitter before connecting to the amplifier’s input. Double-check all connections before powering on the system.
Gain Adjustment Settings
The LLC1 features adjustable gain controls, crucial for matching the LOC’s output to your amplifier’s input sensitivity. Start with the gain knobs turned all the way down. Gradually increase the gain while playing music, monitoring for distortion.
Aim for the highest possible gain without introducing any noticeable distortion. Proper gain staging ensures a clean, powerful signal. Refer to your amplifier’s manual for its input sensitivity specifications to optimize the gain settings for best performance.
Troubleshooting Common Wiring Issues
Diagnose issues like no output, distortion, or noise by checking connections, grounding, and gain settings; ensure proper wiring for optimal performance and sound quality.
No Output Signal
If you encounter no audio output, begin by verifying the vehicle’s stereo is powered on and producing sound through the factory speakers. Confirm all wiring connections to the LOC and amplifier are secure and correct, referencing the appropriate wiring diagram.
Check the remote turn-on wire connection; it must receive power when the head unit is on. Inspect the LOC’s fuse and replace if blown. Test the RCA cables with a known working set. Ensure the amplifier’s power and ground connections are solid. Finally, double-check the input wires are connected to the correct speaker outputs.
Distortion or Noise
Distorted audio or unwanted noise often indicates grounding issues. Ensure the LOC is securely grounded to a clean, unpainted metal surface on the vehicle’s chassis. Verify the RCA cables aren’t routed near power wires, which can introduce interference. Adjust the gain settings on the LOC and amplifier; excessive gain causes clipping and distortion.
Check for loose speaker wire connections. Inspect the input wires for damage. Consider a ground loop isolator if noise persists, especially with aftermarket head units. Confirm the LOC is receiving a clean signal from the factory stereo.
Incorrect Gain Settings
Improper gain settings are a frequent cause of poor audio quality. Start with the LOC gain at its lowest setting and gradually increase it while playing music. Monitor for distortion; if you hear clipping, reduce the gain. Match the LOC output level to the amplifier’s input sensitivity.
Refer to the amplifier’s manual for recommended input voltage. Avoid maxing out the LOC gain, as this can overload the amplifier. Proper gain staging ensures a clean, powerful signal without distortion, optimizing your car audio system’s performance.
Safety Precautions During Installation
Always disconnect the vehicle battery before wiring. Use insulated connectors and protect wires from damage. Prevent short circuits during installation for safe operation.
Disconnecting the Vehicle Battery
Before commencing any wiring related to your Metra line output converter, absolutely disconnect the negative terminal of your vehicle’s battery. This crucial step prevents accidental short circuits, which could damage the LOC, your vehicle’s electrical system, or even cause personal injury.
Locate the negative battery terminal, typically marked with a (-) symbol. Use a wrench to loosen the nut securing the cable, then carefully remove the cable from the terminal. Ensure the cable is secured away from the terminal to prevent accidental contact. Reconnecting the battery is the final step after all wiring is complete and verified.
Proper Wire Insulation and Protection
Maintaining intact wire insulation is paramount for a safe and functional Metra LOC installation. Inspect all wiring for any cuts, abrasions, or exposed conductors before connecting. Utilize high-quality electrical tape or heat-shrink tubing to repair any damaged insulation, ensuring a complete seal.
Route wires away from sharp edges, moving parts, and hot components like the exhaust system. Employ wire loom or conduit for added protection, especially in exposed areas. Secure wires with zip ties to prevent strain and movement, minimizing the risk of future damage and potential short circuits.
Avoiding Short Circuits
Preventing short circuits is crucial during Metra LOC wiring. Ensure no bare wires touch metal vehicle surfaces or each other. Double-check all connections, verifying proper insulation and secure terminations. Use insulated crimp connectors or solder and heat-shrink tubing for reliable connections.
Always install an appropriately sized fuse in the power wire, close to the battery. Avoid overloading circuits by using the correct gauge wire for the amplifier’s power requirements. Regularly inspect wiring for any signs of damage or wear that could lead to a short.
