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Answer:
the at4050 requires phantom power. Does your USB cable provide that?
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Answer:
Thank you for your inquiry. Most XLR to USB cables do not provide phantom power. You will need to use a USB audio inteface that provides a full 48V of phantom power.
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I would like to understand the 48VDC phantom power requirements for the AT4050.
I assume that pin 1 should be the ground for the 48VDC, but is the + side of the 48V DC pin 3?
Thanks!
Eric
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Answer:
DC phantom power is transmitted simultaneously on both pin 2 and 3, with the shield (pin 1) being the ground. Since the DC voltage on the ‘hot’ and ‘cold’ pins (2 & 3) is identical, it is seen by equipment as “common mode” noise and rejected, or ignored, by the preamp or mixing board. This wiring also prevents damage to dynamic microphones that don't require phantom power when they're mistakenly hooked up to phantom power. That's assuming everything is wired correctly!
If you go to your mixer and put a volt meter on pins 1 & 2, or pins 1 & 3, you will see the 48v DC, but if you meter pins 2 & 3 (the audio signal path) you will see no voltage difference since they are both 48v above ground.
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Answer:
Thank you for your inquiry. Phantom power is DC voltage sent down the microphone cable to power the preamplifier of a condenser mic capsule.
A balanced mic cable has three conductors; Pin 1 is ground, Pin 2 is audio positive, and Pin 3 is audio negative. Most microphones produce a positive voltage on Pin 2 when sound pressure is applied to the diaphragm.
Phantom power is 9 - 52VDC applied across Pin 1 and Pin 2 - and at the same time applied across Pin 1 and Pin 3. The term 'phantom power' was assigned because if you take a measurement across the two audio lines - Pin 2 and Pin 3 - you find 0 Volts DC. The voltage does not affect the mic signal.
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