I worked in a cassette duplication plant. We did independent stuff, mostly gospel. The tapes IIRC were not dubbed at high speed but that isn't inherently the biggest problem; the big issue is that it's unlikely that the duplicators are going to be properly and regularly de-magnetized and if that's not done all the high end is going to be massacred on the final tape. We were pretty contentious in our plant to make good product.
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