Sorry I should have clarified. I was responding to the comments about the MCP600 being loud; I don't find it to be a noisy pump at all. I haven't put the MCP650 into service (but I used one of the old louder D4s for a while) so I can't really comment.
Does the resistance where it begins to have a high pitched whine coincide with that where the MCP350 becomes a better choice anyway?
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