Subwoofer feedback - Ford C-Max Forum
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post #1 of 3 Old 03-26-2019, 06:48 PM Thread Starter
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Subwoofer feedback

Hi guys, first off, im a Master Ford tech of 27 years. So, im not a beginner. BUT, i have a problem that is kicking my butt. I have a 2013 C-Max that i installed a self amplified Bazooka bass tube in. These use either a high level input or line level input. So, i tied into the rear door speaker for the high level input. Battery power is directly to the 12v battery and grounded right beside it on the chassis on an open ground location. I have also wrapped the high level wires in Faraday tape. Every time the car transitions between gas and EV and EV to gas, i get horrible feedback. Bad enough it sounds like it could blow the sub. Has anyone else had this happen and if so, why?
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post #2 of 3 Old 03-27-2019, 06:22 PM Thread Starter
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Two days and not a single response?
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post #3 of 3 Old 04-02-2019, 11:29 PM
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Hi b16sir1991. Sorry to hear about your problem. I had a car audio shop for twenty years, But i have never put a system in a hybrid. My first thought was a ground deferential , because of the frame ground point. if possible have a VOM on the ground and power when the power source changes. if the voltage measured changes, that would be your issue. i would recommend running an 8 gauge ground back to the battery/ that should not be difficult as the power side is ran there. Hope this helps.
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