Question about Aphex Channel-Master Preamp and Input Processor

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Getting a lot of noise from new Aphex Channel Master Preamp how do I fix this? I was using a Neuman TLM 103 mic and just recently switched to a Rode Procaster mic but still plenty of noise. I'm sure it's fixable but I can't seem to get it right! Can you help?

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My thought is that this is a gain issue. Too much somewhere, and not enough somewhere else. Try experimenting with the input gain on the unit, and your mixer until you can reach a better noise floor. Otherwise, some units are noisier than other brands inherently. But experiment and see what you come up with. Also check for the +4 or -10dB switch. If there is one, it may be set incorrectly.

Posted on May 30, 2014

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Posted on Jan 02, 2017

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the process of elimation will help you to solve your issue. first plug the rode nt1 (great mic by the way), into a good pa head or something you know works, of course you will need to have a pa that gives you phantom power. if the mic works then move on to the preamp. try it in the pa too, if it works move on to the m-audiophle and plug a line level signal into it (a cd player or mp3 player for instance) it this works then you have determined that everything works and you don't actully have a problem other than switching, Also try plugging your mic into the M-audiophle directly and see if thaat works ( don't know if that provides the 48 volts, if it doesn't than you will have to get a phantom supply to plug into first. good luck

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Neumann TLM mic is inoperative when connected to PA with same cable that worked with Shure SM 58 mic


The Shure SM58 is a dynamic microphone instead of the electret one Neumann TLM 103. This means that Shure does not need a phantom power supply voltage, instead of Neumann TLM 103; this one needs 48Volts. Here are the specifications for each one of the microphones: Shure SM 58 - Neumann TLM 103. In case you use a pre-amplifier or an audio console try to locate a switch marked as "Phantom Power" and turn it on. Typically there is no problem supplying a phantom power at the SM58. In case you have no phantom power switch available, either post back the mixer brand / model to check it for you, or post me a question to suggest you one. Details about the usage and the mixer you are already using will help me to clarify the total audio situation.

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Seems you might have a gate inserted on that mics channel. Or if you are going to a computer, the program you are using might have an insert activated with a gate. Which means when signal gets to a certain threshold, the gate opens and the mic signal passes thru, below the threshold...the gate stays closed and the mic signal will not pass thru. Hope this is helpful.

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This mic likely has a built in preamp. BEFORE you open the mic, verify that your pahntom power from your preamp is clean.

If you are unfamiliar with phantom power for mics, google it to find a treatise.

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