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=== Multi-Mic'ing ===
Since all mics tend to have a weak or noisy spot in the frequency spectrum, combining multiple mics with complementary strengths and weaknesses is a great way to get the richest and highest-quality signal. However, mixing two signals can always introduce further issues if you are not careful. The biggest issue is comb filtering, caused by the mics being unequal distance from the cabinet (or having a certain amount of latency due to their design). The simplest way to fix this is by changing the mic distance(s) until comb filters are eliminated; however, some mics sound best right up against the speaker while others sound better further back. The better way to fix things is via a VST plugin in your DAW or some other device to add latency to whichever mic produces signal earlier to sync them up. I have used Voxengo Sound Delay for this purpose before with great success.
=== Room Placement and Conditioning ===