MobilePre USB Setup and Troubleshooting Thread - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 23 Old 12-23-11, 09:44 AM
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Re: MobilePre USB Setup and Troubleshooting Thread

> One way ( to keep "other" sounds from reaching your subs ) ;

> If you want REW to be the only program sending sounds to your speakers ( & subs ) then don't choose the Mobile USB Pre as your default soundcard for the computer ( selected from within the soundcard control panel ) .

> Choose the onboard soundcard for your computer ( Realtek in your case ) , as the default soundcard / then all other sounds ( non REW ) will route to the onboard soundcard ( RealTek ) .

> Hope this helps .


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post #12 of 23 Old 12-23-11, 09:48 AM
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Re: MobilePre USB Setup and Troubleshooting Thread

Quote:
pbc wrote: View Post
BTW, is there a way to mute all the sounds coming from the computer from going to the sub?
When I want to run a sweep for above the Schroeder frequency to use an ETC or whatever, I just turn my subwoofer amplifier(s) off.
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post #13 of 23 Old 01-08-12, 12:02 PM
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Re: MobilePre USB Setup and Troubleshooting Thread

Thanks for the step-by-step procedure. As a newb it helps.
I have a question that you could probably help with.
I have the new MobilePre USB which is a little different from the original one. The issue I am up against is the outputs. They are now balanced. I checked with an O-Scope and indeed they are truly balanced as the two signal pins are out of phase with the other. I need to connect one of these outputs to an unbalanced input on an amplifier. At this point I am not sure whether it is okay to plug in a TS plug, thus shorting out one pin of the output, or build an adapter that only uses one pin and references to ground. I've emailed M-Audio and have no response yet but am thinking maybe a user in this forum has already been down this road. If anyone has a schematic of this unit it could be helpful too.
Whatever the solution is it would help others if you could add an addendum to your procedures to cover the differences between the older and newer MobilePre.
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post #14 of 23 Old 01-09-12, 10:28 AM
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Re: MobilePre USB Setup and Troubleshooting Thread

I would not short output pins. I'd probably take an RCA cable, remove one end, and install a TRS on it, connecting the center conductor to either the T or R and leaving the other floating (and connecting the shield of course). You can probably buy cables and adapters to do the same thing; one of the common devices is an RCA to XLR cable used to adapt from consumer AVR output to professional equalizer or amplifier; many get this from monoprice.

You can find more information in fotto's thread about the ART USB DualPre which also has balanced ins and outs. There are also a bunch of sticky threads about connecting between pro and consumer equipment on HTS. The bottom line is you should first try direct connections, if that doesn't work in level then try something like a cheap mixer as a preamplifier (Behringer makes a unit with a street price of $35 now). You can also use something like a passive DI box (I know there are some potential issues with this but I don't really know what they are) or a powered unit like the Samson S-convert or ART CleanBox Pro, but the original CleanBox required some mods if you were looking for sub-20Hz performance as are many around here.
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post #15 of 23 Old 01-09-12, 05:08 PM
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Re: MobilePre USB Setup and Troubleshooting Thread

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pbc wrote: View Post
BTW, is there a way to mute all the sounds coming from the computer from going to the sub?
Steve, it seems to me I just muted the laptop card from the speaker icon on the windows taskbar. It showed both realteck and mobile-pre and I just hit mute on realteck.

I just ran into that 2 days ago but I really didn't take note what stopped it. I'm sure the above did the trick.
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post #16 of 23 Old 01-16-12, 11:30 AM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

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Sputter wrote: View Post
Steve, it seems to me I just muted the laptop card from the speaker icon on the windows taskbar. It showed both realteck and mobile-pre and I just hit mute on realteck.

I just ran into that 2 days ago but I really didn't take note what stopped it. I'm sure the above did the trick.
Hey Jim. I haven't had a chance to go back and redo measurements in a while, I did do a review of the PB13-Ultra as I picked up a new Sledge amp for it and quickly ran some close-mic measurements which aren't as simple as I originally thought with ported subs!

Did you end up trying to close mic your VTF-15 subs?
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post #17 of 23 Old 01-16-12, 11:32 AM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Quote:
wbz wrote: View Post
Thanks for the step-by-step procedure. As a newb it helps.
I have a question that you could probably help with.
I have the new MobilePre USB which is a little different from the original one. The issue I am up against is the outputs. They are now balanced. I checked with an O-Scope and indeed they are truly balanced as the two signal pins are out of phase with the other. I need to connect one of these outputs to an unbalanced input on an amplifier. At this point I am not sure whether it is okay to plug in a TS plug, thus shorting out one pin of the output, or build an adapter that only uses one pin and references to ground. I've emailed M-Audio and have no response yet but am thinking maybe a user in this forum has already been down this road. If anyone has a schematic of this unit it could be helpful too.
Whatever the solution is it would help others if you could add an addendum to your procedures to cover the differences between the older and newer MobilePre.
Thanks. Admittedly I'm hoping it helps me as much as it helps others. I cant' explain how many times I've started up REW and my MobilePre only to find some odd thing happening that I can't figure out or recall how I fixed it the last time!

Let us know if what aackthpt posted above helps...
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post #18 of 23 Old 01-16-12, 03:37 PM
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Re: MobilePre USB Setup and Troubleshooting Thread

Yup, pretty much confirmed what I was doing. I couldn't get much info out of M-Audio is why I posted here. Nothing like practical experience when you need help.
I made TRS to RCA adapter. So if for any particular reason I can send opposite phase to each channel. The level drop isn't that great or a problem.
Now I have to decide which software to stick with. I'm sampling ARTA, TrueRTA, REW, & AudioTester.
REW has the edge though as I can run it under Linux and avoid MicroSoft overhead.
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post #19 of 23 Old 01-17-12, 09:08 AM
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Re: MobilePre USB Setup and Troubleshooting Thread

Quote:
pbc wrote: View Post
Hey Jim. I haven't had a chance to go back and redo measurements in a while, I did do a review of the PB13-Ultra as I picked up a new Sledge amp for it and quickly ran some close-mic measurements which aren't as simple as I originally thought with ported subs!

Did you end up trying to close mic your VTF-15 subs?
Not yet Steve, since we're moving off topic i'll email you
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post #20 of 23 Old 01-17-12, 12:43 PM Thread Starter
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Re: MobilePre USB Setup and Troubleshooting Thread

Quote:
wbz wrote: View Post
Yup, pretty much confirmed what I was doing. I couldn't get much info out of M-Audio is why I posted here. Nothing like practical experience when you need help.
I made TRS to RCA adapter. So if for any particular reason I can send opposite phase to each channel. The level drop isn't that great or a problem.
Now I have to decide which software to stick with. I'm sampling ARTA, TrueRTA, REW, & AudioTester.
REW has the edge though as I can run it under Linux and avoid MicroSoft overhead.
I had a similar experience when I thought my MobilePre was shot, i.e., their customer service left a lot to be desired. I'm not even sure I ever even received a response to my emails to their support desk!
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