MobilePre USB Setup and Troubleshooting Thread - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 21 Old 12-20-11, 02:54 PM Thread Starter
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MobilePre USB Setup and Troubleshooting Thread

Not sure if one of these exists, and after all the issues I've had, figured I'd start one here and hopefully save anyone else from buying a new MobilePre thinking their's was shot!

Equipment and Software

This is the MobilePre I'm using...



Okay, so first things first, go download the appropriate drivers from M-Audio. I'm using Windows 7 64 Bit for the MobilePre (not the 2nd generation in my case).

http://www.m-audio.com/index.php?do=...e3&OS=x85#tabs

I didn't bother downloading any of the CD's provided in the box by M-Audio.

I'm also using a Dayton EMM-6 mic calibrated by CSS Labs (thanks Herb!).

http://www.cross-spectrum.com/measur...ed_dayton.html

Cables Required

To hook up the MobilePre (run a calibration and measurements) you'll require:

2 of RCA Jack To 1/4" Mono Plug Adapter
http://www.parts-express.com/pe/show...number=090-285

1 RCA Cable, length will depend on how far your laptop is to the AVR. 15 to 25 feet is probably fine.
http://www.monoprice.com/products/pr...seq=1&format=2

To hook up the Mic, you'll need a female to male XLR cable.
http://www.monoprice.com/products/pr...seq=1&format=2

Setting up the Sound Card

Step 1: Double Click on the MobilePre icon in the bottom right corner of the Windows screen to bring up the MobilePre USB Control Panel.



Step 2: Setup the various items as shown in the pics below:



(more on the "Latency Settings" later)

Last edited by pbc; 12-20-11 at 03:20 PM.
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post #2 of 21 Old 12-20-11, 02:55 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Step 3: Go into your Control Panel and Select "Manage Audio Devices" once you've plugged in your MobilePre and ensure you are setup as follows:
Attached Thumbnails
MobilePre USB Setup and Troubleshooting Thread-soundcard-settings-microphone.jpg  

MobilePre USB Setup and Troubleshooting Thread-soundcard-settings-playback.jpg  

MobilePre USB Setup and Troubleshooting Thread-soundcard-settings-recording-advanced.jpg  

MobilePre USB Setup and Troubleshooting Thread-soundcard-settings-recording-levels.jpg  

MobilePre USB Setup and Troubleshooting Thread-soundcard-settings-recording-listen.jpg  


Last edited by pbc; 12-20-11 at 03:25 PM.
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post #3 of 21 Old 12-20-11, 02:56 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Step 4: Not that you've setup your cards appropriately, you'll need to launch REW and click on "Preferences". In preferences, click on Mic/Meter and select the calibration file provided with your microphone (either a specific file from CSS Labs or an averaged one from the Shack). Don't bother with the C weighted box.

Step 5: Hook up your MobilePre to run a sound card calibration. Essentially you're going to connect two of the 1/4" Mono plugs, one into the 2/R Output and one in to the Ch2 Inst/Line Input, then connect the red ends of your RCA cables one into each of the RCA to 1/4" TRS adaptor to create a loopback.

Step 6: Ensure your Channel 2 volume level is about 1/4 of the way up, Mic volume is muted and Phantom Power is OFF.

Step 7: Select the M-Audio devices for your output and input devices on the Soundcard tab of REW in the Preferences section. Check that the sweep level is between -6 and -12 db (I typically use -10db).

Step 8: Click on "Calibrate", then increase/decrease the Channel 2 volume knob on the MobilePre until you're levels for Out and In are about the same. Then click on Next, to run a sound card sweep and you should end up with a nice curve that looks like the one below. Click on "Make Calibration" and save that calibration to your hard drive.

Step 9: Disconnect the 1/4" TRS from the Ch2 Output. Remove the 1/4" Adaptor, and connect the red end of the RCA jack into the red "Aux" jack on your AVR or Processor (usually at the front of your unit). Ensure you've selected the proper Input (Aux) on your Processor/AVR. I usually use "Multichannel In" as the surround mode to ensure the subwoofer is engaged.

Step 10: If only measuring your sub at first, disconnect all your other speakers from your AVR, or alternatively, turn off your amp if you use an amp/processor combination.

Step 11: Connect the XLR cable to the Ch2 Input XLR connection on the MobilePre and the other end to your EMM-6 mic.

Step 12: Click on SPL Meter to calibrate your SPL levels. Generally I'll tape the EMM-6 mic to my Galaxy CM140 meter for most of my measuring sessions (it's just easier). Increase the volume on your processor until it reads around 75db.

Step 13: You're ready to measure. I hope!
Attached Thumbnails
MobilePre USB Setup and Troubleshooting Thread-rew-preferences-soundcard.jpg  

MobilePre USB Setup and Troubleshooting Thread-sound-card-calibration.jpg  


Last edited by pbc; 12-20-11 at 03:31 PM.
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post #4 of 21 Old 12-20-11, 02:56 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Toubleshooting

For some reason, sometimes when you run a sound card calibration, you'll get a really "noisy" result with lines all over the place like in the attached picture.

As far as I can tell, this is possibly the result of a few things:

1. Your cables are all twisted. Try untwisting them.
2. Your AC cable from your laptop is too close to your RCA cables.
3. Your Latency (see post 1) needs to be adjusted higher or lower (note, you have to exit REW to do this).

Sometimes this keeps on persisting, and you may need to reboot. I have no idea why this happens but playing around with the above seems to make it eventually go away.

Now, when actually running measurements, sometimes you'll hear this "noise/warbling" of the tone coming out of your subwoofer. Cancel the measurement, and check all of the above again. Usually it has something to do with the cables in my experience and fiddling with them tends to make the tone go away. Sometimes you just have to keep running measurements a few times and it just suddenly works.

I know, it sounds weird, but that has been my experience (I actually bought a new MobilePre thinking my last one was shot).


Other Items to Check

Download the most recent version of Java ....

http://www.java.com/en/download/index.jsp
Attached Thumbnails
MobilePre USB Setup and Troubleshooting Thread-soundcard-issue.jpg  


Last edited by pbc; 12-20-11 at 03:36 PM.
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post #5 of 21 Old 12-20-11, 02:57 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

No idea why all these pics are showing up so many times? Was trying to get them to show up after each step instead of at the end but didn't seem to work. Maybe a mod can clean these up as I can't figure it out?

Last edited by pbc; 12-20-11 at 03:21 PM.
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post #6 of 21 Old 12-20-11, 02:58 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Anyhow, hopefully this helps people out who have the MobilePre and keeps them from spending hours (as I have) trying to figure out the various issues each time.

Hey, if anything, it will help me out next time I measure I hope! I'll update it as I encounter more issues.

If you guys are using the MobilePre and either a) notice something incorrect in the above or come across another odd issue, let me know and I'll update this thread for those.

Last edited by pbc; 12-20-11 at 03:22 PM.
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post #7 of 21 Old 12-20-11, 03:22 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

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post #8 of 21 Old 12-20-11, 03:27 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

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post #9 of 21 Old 12-21-11, 09:26 AM
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Re: MobilePre USB Setup and Troubleshooting Thread

I use the same unit and the Dayton EMM-6 mic. I use the input gain at 0 rather than +12, and with the right (main/input/non-reference) channel input gain knob at the top, it puts the overall input gain into the correct range for the REW sweep. This way I almost never have to redo the SPL meter calibration in REW because I know I can just pin the knob and I am at the same input side gain as always.

I have had and fixed the warbling issue by unplugging/replugging the USB. I'm not sure if it resets the MobilePre itself or the drivers in the OS or what, but it works and I have never moved the cables around or anything when I did it.
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post #10 of 21 Old 12-23-11, 08:28 AM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

BTW, is there a way to mute all the sounds coming from the computer from going to the sub?
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