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Rest assured, say the sound experts, that one way or the other, the cost of adding noises to electric vehicles will end up in the sticker price.
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haha. In a way, they are right. In order for spread spectrum to work, it has to run at a lower frequency, which makes for less heat generation, which reduces the amount of cooling necessary, which lowers the overall price.
Since it seems that the driver section is working, I feel safe now to finish the AC board, and send it in. Spread spectrum switching can be used in the AC case too.