Hi,
Wow, you must be drawing a ton of power. The alternator is what should be keeping the voltage near 14 (engine running).
I'm not an audio expert, but it sounds like you are drawing more than the alternator can support. Here is where I would start. Visit a local parts store such as AutoZone and have them load test the battery and check the alternator under a load. See if things hold up to being tested.
Let me know.
Joe
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Friday, June 7th, 2024 AT 8:42 PM