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Author Topic: Measurement Disaster -- M-Audio  (Read 754 times)

Frank Koenig

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Measurement Disaster -- M-Audio
« on: September 24, 2019, 06:25:12 pm »

I've been using an M-Audio "Fast Track Pro" USB interface with a Windows laptop for making speaker measurements since around 2011 or 2012. I've made 100s of measurements on various speakers, often involving loading gear, driving out to some suitable place, and hauling speakers up and down lifts repeatedly to change the vertical angle. In short, a shitton of work.

Now I'm crying in my coffee. I just discovered that when using ARTA the damn drivers sometimes operate the interface at Fs = 44.1 kHz even when everything is set to 48 kHz. This is very insidious, as it just shifts all frequency responses up by 48/44.1 = ~9%. This, apparently, is just enough to mess things up slightly while not so bad as to be obvious when doing an overall system check with Smaart. A loop-back test, which I do now and then, looks perfect. I had no clue until I exported some curves to Armonia and then measured the response of the DSPs to put the settings back into a model. I can convert the sampling rates of my past measurements to fix them but I have to determine which ones are affected. I can't find any clue in the files as ARTA treats them all as 48 kHz. All I can think to do (after I put the M-Audio in the driveway and run it over with the van multiple times) is repeat some measurements on each speaker and look for the frequency of any "signature" resonances. This really sucks.

I now need to buy a small interface with rock-solid ASIO drivers. I'm looking at Focusrite "Clarett2Pre" as, among other things, it has independent phantom power switches for each input. I'd prefer something with a 120 VAC power input instead of a wall-wart, but it seems like you have to get into a large rack-mount unit to get that. I very much appreciate any recommendations. Thanks.

--Frank
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Russell Ault

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Re: Measurement Disaster -- M-Audio
« Reply #1 on: September 24, 2019, 08:55:03 pm »

I now need to buy a small interface with rock-solid ASIO drivers. I'm looking at Focusrite "Clarett2Pre" as, among other things, it has independent phantom power switches for each input. I'd prefer something with a 120 VAC power input instead of a wall-wart, but it seems like you have to get into a large rack-mount unit to get that. I very much appreciate any recommendations. Thanks.

Have you looked at the B-word UMC202HD? No wall-wart because it's bus-powered; never had any driver issues. Price is right...

-Russ
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Dave Garoutte

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Re: Measurement Disaster -- M-Audio
« Reply #2 on: September 24, 2019, 09:41:29 pm »

Bummeroskies :-[
I've done similar things while machining parts.  Made a very reasonable assumption that bit me big time later.

I use the Roland Octa-Capture as used by the SMAART class instructor.
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Barry Reynolds

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Re: Measurement Disaster -- M-Audio
« Reply #3 on: September 24, 2019, 10:06:57 pm »

Bummeroskies :-[
I've done similar things while machining parts.  Made a very reasonable assumption that bit me big time later.

I use the Roland Octa-Capture as used by the SMAART class instructor.

You guys probably know what happened to Van Halenís live show when the digital out of a synth doing backing track of ďJumpĒ was set to 44.1 and the PA was running at 48K.   :-\

The backing track played in between keys.  The musicians just continued in the record key.
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Frank Koenig

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Re: Measurement Disaster -- M-Audio
« Reply #4 on: September 24, 2019, 11:59:37 pm »

You guys probably know what happened to Van Halenís live show when the digital out of a synth doing backing track of ďJumpĒ was set to 44.1 and the PA was running at 48K.   :-\

The backing track played in between keys.  The musicians just continued in the record key.

At least Stonehenge in "This is Spinal Tap" was off by a factor of 12. This is more like the Hubble telescope. Thank you all for the replies. --Frank
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Martin Morris

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Re: Measurement Disaster -- M-Audio
« Reply #5 on: September 25, 2019, 03:08:54 am »

Have you looked at the B-word UMC202HD? No wall-wart because it's bus-powered; never had any driver issues. Price is right...

-Russ

I think Ivan uses the UMC202HD with a Mac.

I tried the UMC202HD with Systune - gave up getting ASIO to work on a windows machine. Lots of emails back and forth to AFMG .... Grrrr. Went with a focusrite 2i2 which has been rock solid.

Cheers
Martin
« Last Edit: September 25, 2019, 03:11:41 am by Martin Morris »
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David Sturzenbecher

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Re: Measurement Disaster -- M-Audio
« Reply #6 on: September 25, 2019, 07:11:34 am »

Went with a focusrite 2i2 which has been rock solid.

Cheers
Martin

My 2i2 was rock solid until it became a rock. The analog bits of it worked, but nothing digital on it would... and therefor hit the trash.
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Mark Wilkinson

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Re: Measurement Disaster -- M-Audio
« Reply #7 on: September 25, 2019, 08:50:31 am »

Uhg, sorry Frank.

How many mics? 
If just one, and for a bit of $$, the RME baby face pro is really nice. Precise preamp levels set in software. Runs off USB power so no wall wart.  (Not sure if the USB would handle a high current-draw mic like a M30 though, without a power supply.  I'd ask the Rational Acoustics folks.) Oh, and you could use it for two mics, but your reference feed from it will be a single ended headphone out instead of balanced. It doubles as a neat little mixer and DAC.
I was at an advanced practicum held at the RA office in CT last week and heard Roland wants to be done with the Octa-capture. It's a great unit but not sure I'd go that way now.
We were told to bring our sound cards...I think I saw more UMC404s than anything else, but it was a very small group  (5).
Speaking of the UMC 404HD...that would be my vote for solid and value.  Wall wart though. 
But I think best for field work would be a XR-18 (or X-32 rack).  Plenty of channels and recallable preamps, which is huge plus...especially if SPL monitoring takes off.
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Nathan Riddle

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Re: Measurement Disaster -- M-Audio
« Reply #8 on: September 25, 2019, 10:57:26 am »

Uhg, sorry Frank.

How many mics? 
If just one, and for a bit of $$, the RME baby face pro is really nice. Precise preamp levels set in software. Runs off USB power so no wall wart.  (Not sure if the USB would handle a high current-draw mic like a M30 though, without a power supply.  I'd ask the Rational Acoustics folks.) Oh, and you could use it for two mics, but your reference feed from it will be a single ended headphone out instead of balanced. It doubles as a neat little mixer and DAC.
I was at an advanced practicum held at the RA office in CT last week and heard Roland wants to be done with the Octa-capture. It's a great unit but not sure I'd go that way now.
We were told to bring our sound cards...I think I saw more UMC404s than anything else, but it was a very small group  (5).
Speaking of the UMC 404HD...that would be my vote for solid and value.  Wall wart though. 
But I think best for field work would be a XR-18 (or X-32 rack).  Plenty of channels and recallable preamps, which is huge plus...especially if SPL monitoring takes off.

FWIW, I've used my UMC404 without wall wart for a long time, no issues. Im sure it depends on the mic, but my Behringer mics do fine even loaded up with 3 mics and a loopback.

I am enjoying the babyface pro though.
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Erik Jerde

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Re: Measurement Disaster -- M-Audio
« Reply #9 on: September 25, 2019, 12:05:10 pm »

For single mic & loopback work Iím using a sound devices usbpre2 with a m30.  If I was buying today Iíd get something with software controlled preamps so that I didnít have to calibrate spl every time I used the interface for something else.
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Re: Measurement Disaster -- M-Audio
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