I noticed something last night with my duo. For the first time in a long time, we had a little bit of feedback going on. We were decently in front of the Bose system and at about 45 degree angles from it. I used my Sennheiser 535 and my singer used his trusty SM58. With both mics at the same eq settings and volume (both using the Bose presets for the particular mic), the SM58 was getting some feedback.
No feedback with the Sennheiser.
Bose Live Music Team
Not being a mic expert I can only guess that the 535 has a tighter cardiod pattern than the 58.
What size of room were you performing in? I have experienced more feedback issues in very small venues (with lots of glass) and attribute the feedback to the reflections off of very close walls and windows. Larger rooms and outdoors seem to offer much better feedback rejection.
I use preset 04 vs.2 in those types of situations. It will take care of that high end feedback in tight spots.
Bose Assisted Direct Sales
I'ved found the SM58 to be a bit more challenging in terms of gain-before-feedback. I find the Beta 58A to be far superior in this regard. As Mark mentioned, the SM58 has a pretty wide pickup pattern. It also has a pronounced 'presence peak', which is part of what was addressed by the Preset. Are we correct in assuming that you were getting high-pitched squeals from the 58? If so, I agree with Dan's suggestion, v2 Preset 04. You might also try tweaking down the highs on the eq just a tiny bit, enough to help with the squeal, but not so much that it takes all of the air out of your voice...
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