If you want to use a condenser mic like an 87, 865 or C5, I highly recommend always having a standard dynamic with you as a back up - 58, beta 58, 835, D5.
Sometimes there isn't phantom power available (believe it or not) and sometimes the stage is so small that the condenser is too sensitive and causes feedback too easily. Switch to that dynamic and those problems usually go away, or at least feedback is much easier to control.
As far as the 87a vs 87c, the supercardioid A will reject more feedback from the sides, but you need to be right on the center/top of the mic to be heard as the pickup is tighter there. Also, it picks up sound from the rear of the mic as well (compared to a cardioid that doesn't). So you can't/shouldn't put a stage monitor directly in front of you as it will aim directly at the rear of the mic that picks up sound.
Most singers who use a super or hyper mic have the 2 monitor setup at a 45 degree angle, where the mic rejects the sound.
Just be aware. At certain volumes, it won't be an issue, but if your A supercardioid gets feedback when everyone else's cardioid 58s don't, that's probably the issue.
Sometimes there isn't phantom power available (believe it or not) and sometimes the stage is so small that the condenser is too sensitive and causes feedback too easily. Switch to that dynamic and those problems usually go away, or at least feedback is much easier to control.
As far as the 87a vs 87c, the supercardioid A will reject more feedback from the sides, but you need to be right on the center/top of the mic to be heard as the pickup is tighter there. Also, it picks up sound from the rear of the mic as well (compared to a cardioid that doesn't). So you can't/shouldn't put a stage monitor directly in front of you as it will aim directly at the rear of the mic that picks up sound.
Most singers who use a super or hyper mic have the 2 monitor setup at a 45 degree angle, where the mic rejects the sound.
Just be aware. At certain volumes, it won't be an issue, but if your A supercardioid gets feedback when everyone else's cardioid 58s don't, that's probably the issue.
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