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Sounds like a weak or missing Phantom Power Supply. This power is supplied by the source "mixing console" and can be turned off on many models of consoles. If you have a smaller and lower end mixer it is possible it does not provide the needed Phantom Power. Also if the mic cable is incorrectly wired the Phantom Power is not being properly supplied to the mic. This also could damage the mic by putting the voltage on the wrong pin connections. Pin 1 is ground, pins 2 and 3 are audio high and low. Sorry I do know the exact connection for 2 and 3. The user/owners manual may supply the correct wiring information. A store bought cable of good quality should already be wired correctly.
The Behringer C-1U is a USB condenser mic for recording individual instruments. A condenser microphone is a mic that uses vibrations produced by sound to change the distance of internal plates that produce signal. Condenser mics typically require an extra change, known as phantom power, to operate. Since the C-1U is USB powered, phantom power is not needed. The Behringer C-1U has a frequency response that favors sounds around the 10KHz range. This heightens the clarity of recorded signals due to the microphone's treble boost.
Things You'll Need:
* Computer with USB 2.0 port * USB cable * Recording software
Turn on the computer. When the operating system loads, connect the microphone.
Install any necessary drivers for the C-1U. This will happen automatically when the device is connected.
Select the Behringer C-1U as an input source in any desired audio software. In Windows, click the "Volume" icon in the task bar to open the mixer. Select the C-1U as the primary input. On Macs, use the "Audio/MIDI Setup" in the "System Preferences" menu to select the C-1U as the primary input
Note: make sure you activate the phantom power on the mic. That's the only way to power up the microphone.
Typically you want to wear the mic 6 to 8 inches below your chin clipped to the lapel area. It seems in this case it has more to do with EQ and speaker placement. If you can stand behind the speakers while using the mic. The sound bouncing back and forth between the mic and the speaker is what causes feedback. Also try setting the mic channels EQ with the following settings.
Turn Lows down to about 7 to 9 O'clock
Play with Mids to match actual source, but never boost above 12 O'clock
Keep highs around 10 O'clock (boosting highs increses chances of feedback.) If to muddy sounding keep highs aroun 12 but not over.
What sort of a preamp are u using this needs to be plugged into the lo impedance XLR input (this is a lo output dynamic mic 1.85Mv out)
The XLR should be input pin 2 return (gnd) pin 3.This mic does not NOT use phantom power (48v) if it is a dual input (pin 1 48v) source make sure the phantom power is turned of.
If this is being done then there maybe a problem with the mic.
You can check this by plugging a source in to the input to check that it is working line out from cd player midi or some other source.
If it is an adapter type power supply, you may need a new adapter. If this type of supply is left plugged into the wall over time it can burn out from overheating or transients in the power etc. Also it appears that these have rechargeable batteries in them. Have you tried putting double A batteries in the battery compartment if there is one? The website is :http://www.magicsing.com.ph/faq.html#5