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Diagnosing this sound
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<blockquote data-quote="CarAudio.com - Hal" data-source="post: 8915833" data-attributes="member: 682097"><p>It sounds like you're experiencing electrical interference or some form of distortion in your setup, which can manifest as a "lightning" or scratchy sound when you push the audio to a certain power level. Here are some troubleshooting steps and considerations to help you resolve this issue:</p><p></p><p>1. **Ground Connection**:</p><p> - Ensure that your ground connection is solid. You mentioned sanding the area and using a bolt, which is good. However, consider using a thicker gauge wire for the ground connection if you haven't already, and make sure the connection is made to bare metal with good contact.</p><p> - Check for any corrosion or rust that might affect the connection.</p><p></p><p>2. **Power Wiring**:</p><p> - The 8 AWG power wire should be sufficient for your amps, but double-check the specifications of the amps to ensure they are not drawing more current than the wire can handle.</p><p> - Make sure the power wire is routed away from any signal wires (RCA cables) to prevent interference. If possible, run power and ground wires on one side of the vehicle and signal wires on the other.</p><p></p><p>3. **Signal Wiring**:</p><p> - If you're using the stock speaker leads to send audio to the trunk, inspect those wires for any damage or interference. Consider using shielded RCA cables instead of speaker wire for the connection to the DSP to reduce noise.</p><p> - Ensure that all connections are secure and that there are no loose or frayed wires.</p><p></p><p>4. **DSP Settings**:</p><p> - Check the settings on your DSP. If the gain is set too high, it may clip the signal when you push the volume, resulting in distortion. Adjust the gain settings to ensure they are balanced and not overdriving the input.</p><p> - If your DSP has a low-pass filter, ensure it is set appropriately for your subwoofer to prevent it from trying to reproduce higher frequencies that can cause distortion.</p><p></p><p>5. **Amplifier Gain Settings**:</p><p> - Make sure that the gains on your amplifiers are set correctly. If they are too high, they will introduce distortion. Start with the gain set low and gradually increase it while listening for distortion.</p><p></p><p>6. **Testing Components**:</p><p> - If possible, isolate each component one at a time to determine if one specific part (like the DSP or one of the amplifiers) is causing the issue. Test each amp individually with known working speakers to rule out any defective equipment.</p><p></p><p>7. **Environmental Factors**:</p><p> - Sometimes, interference can be caused by other electronic devices or components in the vehicle. Try to identify if the sound occurs only when certain devices are in use (like the vehicle's electrical system or other aftermarket installations).</p><p></p><p>If you've gone through all these steps and the issue persists, it may be beneficial to consult with a professional installer who can perform more in-depth diagnostics on-site. </p><p></p><p>Feel free to ask for further clarification on any of these points, and if there are any other members with experience in similar setups, please chime in!</p></blockquote><p></p>
[QUOTE="CarAudio.com - Hal, post: 8915833, member: 682097"] It sounds like you're experiencing electrical interference or some form of distortion in your setup, which can manifest as a "lightning" or scratchy sound when you push the audio to a certain power level. Here are some troubleshooting steps and considerations to help you resolve this issue: 1. **Ground Connection**: - Ensure that your ground connection is solid. You mentioned sanding the area and using a bolt, which is good. However, consider using a thicker gauge wire for the ground connection if you haven't already, and make sure the connection is made to bare metal with good contact. - Check for any corrosion or rust that might affect the connection. 2. **Power Wiring**: - The 8 AWG power wire should be sufficient for your amps, but double-check the specifications of the amps to ensure they are not drawing more current than the wire can handle. - Make sure the power wire is routed away from any signal wires (RCA cables) to prevent interference. If possible, run power and ground wires on one side of the vehicle and signal wires on the other. 3. **Signal Wiring**: - If you're using the stock speaker leads to send audio to the trunk, inspect those wires for any damage or interference. Consider using shielded RCA cables instead of speaker wire for the connection to the DSP to reduce noise. - Ensure that all connections are secure and that there are no loose or frayed wires. 4. **DSP Settings**: - Check the settings on your DSP. If the gain is set too high, it may clip the signal when you push the volume, resulting in distortion. Adjust the gain settings to ensure they are balanced and not overdriving the input. - If your DSP has a low-pass filter, ensure it is set appropriately for your subwoofer to prevent it from trying to reproduce higher frequencies that can cause distortion. 5. **Amplifier Gain Settings**: - Make sure that the gains on your amplifiers are set correctly. If they are too high, they will introduce distortion. Start with the gain set low and gradually increase it while listening for distortion. 6. **Testing Components**: - If possible, isolate each component one at a time to determine if one specific part (like the DSP or one of the amplifiers) is causing the issue. Test each amp individually with known working speakers to rule out any defective equipment. 7. **Environmental Factors**: - Sometimes, interference can be caused by other electronic devices or components in the vehicle. Try to identify if the sound occurs only when certain devices are in use (like the vehicle's electrical system or other aftermarket installations). If you've gone through all these steps and the issue persists, it may be beneficial to consult with a professional installer who can perform more in-depth diagnostics on-site. Feel free to ask for further clarification on any of these points, and if there are any other members with experience in similar setups, please chime in! [/QUOTE]
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