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Old 22nd February 2011, 03:36 PM   #1
Alex M is offline Alex M  United Kingdom
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Default Measuring system for use with a Mac

I think I am about 80% there with my new crossover for my three-way DIY system. I have done electrical response measurements on the filters which are for the most part consistent with my predictions, but until now have had no way of making serious acoustic measurements to confirm how the drivers will combine in the room.

So I am looking for a relatively low-cost measuring system with MLSSA-type software and a USB ADC, both of which will work with my new MacBook with Snow Leopard.

Does anyone have any suggestions?

Thanks!

Alex
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Old 22nd February 2011, 03:56 PM   #2
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Fuzzmeasure is the goto software. Room EQ Wizard's price cannot be beat (free).

FFT / RTA measurement software for Mac

dave
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Old 23rd February 2011, 02:50 PM   #3
Alex M is offline Alex M  United Kingdom
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Thanks for the recommendations, Dave.

the Focusrite Saffire seems to do what I want, though I don't think I need the multiple I/O that provides.

What do you think of this one? It is about half the price of the Focusrite.

E-MU 0202 USB ultimate portable USB audio interface for Mac and PC

I will look around for software.

Alex
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Old 23rd February 2011, 04:25 PM   #4
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Since i got my Edirol FA-66 (Firewire) I/O device i haven't paid much attention. It is a competitive market.

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Old 23rd February 2011, 04:43 PM   #5
imix500 is offline imix500  United States
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Specrafoo is also pretty killer.
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Old 23rd February 2011, 06:56 PM   #6
Alex M is offline Alex M  United Kingdom
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How much would my choice of audio interface hardware be likely to limit my options for RTA software packages?

Thanks,

Alex
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Old 23rd February 2011, 07:43 PM   #7
Helmuth is offline Helmuth  Netherlands
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I use on my macbook-pro (freeware) virtual box and installed XP there.
VirtualBox

This to use windows freeware. Like Arta MLS.ARTA Home

Windows starts faster on a mac then on a windows machine. I have a virtual drive in virtual xp witch on the mac is a folder so through this trick my windows and mac project are passed through.

On my laptop most of the time both operating systems are running the same time.
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Old 25th February 2011, 02:01 PM   #8
Pallas is offline Pallas  Pakistan
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Quote:
Originally Posted by imix500 View Post
Specrafoo is also pretty killer.
Looks cool, but expensive. For our purposes, what does it offer that FuzzMeasure doesn't?

Quote:
Originally Posted by Alex M View Post
How much would my choice of audio interface hardware be likely to limit my options for RTA software packages?
I wouldn't expect it to have much impact. Lots of people run FuzzMeasure with USB boxes. I use an M-Audio FireWire Solo I've had for years. I also even use an Audyssey calibration mic that came with a receiver direct into the MacBook's headphone in for quick-and-dirty measurements.
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Old 25th February 2011, 04:00 PM   #9
imix500 is offline imix500  United States
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Quote:
Looks cool, but expensive. For our purposes, what does it offer that FuzzMeasure doesn't?
Fuzzmeasure looks like a cool little application. I'm thinking about getting the demo and putting it through it's paces.

I mentioned it because well, it's worth mentioning. Though it's not my daily driver measurement software- that's mainly Smaart and SIM3.

Yes, Spectrafoo is probably overkill but it's pretty obvious it can do things Fuzzmeasure cannot. Relative phase measurements for one- again I havn't played with Fuzzmeasure yet, but I don't see it mentioned.
You can look through the Spectrafoo standard features pages alone to get an idea.
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Old 25th February 2011, 04:18 PM   #10
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Funny you mention MLSSA, since I've thought about selling mine. But I don't know that I'm quite ready to.

Anyway, I'm not familiar with all the softwares lately. Just be sure that:
1,2) You can measure impedance curve magnitude AND phase
3,4) You can measure SPL curve magnitude AND phase
- The phase is MEASURED; I don't like calculated phase because that assumes the phase is well behaved which is not always a good assumption.
It's not clear to me that the softwares mentioned above can easily do all 4. Maybe they can, I just don't know.

What are you using for a simulation? LEAP is still my favorite. I don't really know of a Mac package-does anyone? I'd sure be curious.
Gotta be something that does a hard number-crunching voltage divider from the SPL data of the transducer + impedance data of the drivers (Which is why you need the measured phase...)
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