This works best when performing a routine that requires the set to reply to a question or statement.

If your target says something, simply turn to her and say, "You should really speak up more." Or something of the sort. Immediately continue with your routine. If you allow your target to reiterate her comment or question, you would be telegraphing interest, and too soon. It is not insulting because you are not directly saying "You mumble a lot." It is advice.

You could also use this when she asks a question, perhaps to a story you are telling. I would recommend using this once per target, or else she might become offended.

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"Do you think women have a clue what goes on up here? What do they think, it's all stock quotes, drill bit sizes? They don't know shit! Let's keep it that way."

Yes, it's a good DLV technique. I've had it used on me before. Pretending not to hear a person or telling them they need to speak up louder.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

thats great, im not just going to use that exact one but advice negs in general, thanks