Hey I had recently gone from an Alpine S a60m powering my 8w7 to an Alpine X a90m and it worked great the first two startups but when I got in my car last time the sub or amp was not working correctly. I turned my car off and on again and heard a nasty crunching noise! The light on the top of the new amp was red so I checked the fuses on the block and the online fuse to the battery and they are all good. I made sure that the amplifier body was not damaged or grounding itself out on any stray wires or seat rails and it was all fine! I decided to record myself starting it up again and you can see it starts up but then crackles, turns red, then smokes. Hopefully the video attached correctly
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The formula is Square Root of your target Wattage Multiplied by Ohms.
50Wx4Ohms=200. Square root of 200 is 14.14. So 15v AC is your target.
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