Really low singal with MXLV67G and M-Audio MTrack Plus

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strangerthink

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Hey guys! I'm new here, but I'm ready to be torn apart for it.

Anyways, I have been recording with a very basic setup which originally consisted of the MTrack Plus and an MXL 910. A few months ago, my the 910's signal became immediately lower than its original capacities. In order to get substantial dB I had to crank the gain to almost the 3 o' clock position, and the response was not a clean tone either.

I had dropped the microphone before, and since it is lowend, I naturally assumed that I had broken an internal component of the microphone. I did not at the time however consider the fact that I had started using a few different handme down XLR cables, that may have caused some damage to the circuitry.

Fast forward, and I am buying an MXL V67G to solve my low signal issue. Unfortunately, it didn't. My signal response is still pathetic and its almost as if the Phantom power is working at half capacity. I have tried three different XLR chorsds with this and still no luck.

With a decent amount of googling I learned of multimeters, so I tested the output of my XLR port w/ Phantom power and tested the Female end of one of my XLR chords while plugged in w/ phantom power.

The results were even more confusing,
here is a video of me testing the interface .https://youtu.be/foppen6IX14

With Red probe all the way in the right hole: black on middle gives a reading of 50.3, black on left does about 50.2

With Red probe all the way in the left hole: black on middle reads 0.0, black on right does 50.2

Attached pictures show the readings with the probes in the XLR but they are essentially the same so I won't bother writing them up.

So what is going on here? Why are all of my terminals reading around 50 volts, except for one exchange? And why am I getting such low mic signal? Did I some how short both of my mics? Thanks for your time
 

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In the thread I linked you mentioned you were using Reaper. What version Windows operating system are you using?

Not encouraging, but in a Google search I found a few others complaining of low audio levels with MAudio interfaces.

May not help considering some of what you had related, but perhaps reinstalling the drivers/software may help. Pay particular attention to the Control Panel setups. Be sure to use the latest from MAudio's website. Are you using ASIO4ALL?

Windows 10 with the most up to date Reaper setup, I will reinstall drivers tomorrow morning, and I already checked all the control panel settings. And no, I am using the standard ASIO drivers that come with the MAudio drivers. The only thing is I don't believe this to be a software issue, it seems more like a hardware problem because my levels that are directly on the interface/the direct monitoring don't perform correctly.
 
Unfortunately the specifications for that mic does not include the phantom power current pull and it is possible (but unlikely) that the AI cannot deliver enough juice.

To check this you need to measure the voltages at pins 2 and 3 ref pin 1 WITH the mic connected. Therefore you need to remove the XLR from its casing. Do not worry, no one ever died from a spook juice source! I doubt you would even feel it.

Don't want to rain on it but! With a sensitivity of just 15mV/Pa and a self noise of 20dB that is a pretty poor specc' for an LDC. In fact it is about the same as my AKG P 150s.

Dave.
 
Ok, well 3mils should give around 38-40 volts on the back of the XLR .

Mark, did not mean to imply that the V67G is a BAD mic! No, just that it is a bit lower in output than I expect the big side address jobbies to be. As I said, the spec is on a par with my AKG SDCs and they have never been a problem, even with my old Fast track pro and that had properly shite mic preamps!

Dave.
 
- V67G current draw from the spec sheet on mine < 3.0ma. Not noticed much if anything of its self noise.
- Yes, the V67G output is lower, but I've never had an issue with gain on anything I plug it into (Being sort of an anal techy sort of guy, I actually have a spreadsheet of all my mics that includes sensitivities which gives me some relative idea where a gain might be set at when I plug in).
- Remotely possible something changed in the computer that the USB power isn't doing what it should to power the interface.
- Where the headphone output seems to have diminished which shouldn't be affected by the drivers or computer software, I'm sort of inclined to think the the interface may have an issue.

strangerthink..... if you still have the previous mic, I'm assuming both it and the V67 are showing the same low levels, just to sort of verify the V67 doesn't have a problem?

Yes arcaxis, both the MXL 910 and MXL V67G are not picking up levels above around -15 dB (on the interface) without pumping the gain very high. I originally assumed it was the mic, but now I am searching for a another issue in the chain. I thought it to be the XLR or the interface, but isn't it odd that I am receiving adequate voltage from both based on the multimeter reading?

My only other assumption could be that somehow I blew the preamp inside the interface, or something in my interface/xlr blew the mic pres as soon as I plugged them in due to a hardware malfunction or shortage.

Thanks again guys! You're a huge help, I am just trying to get on my recording feet again so I can finish this EP.
 
I have now reinstalled the drivers for the interface, and to no avail...
 
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