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  #1  
Old 12-07-2014, 04:58 PM
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Default Maybe the best $20 you can spend for your system.

This is an iPhone app from Studio Six Digital called AudioTools. It's actually a very powerful tool with a ton of options that I've barely scratched the surface of.

These apps were previously just play toys, but this thing is legit. Used to be that the internal mics were just "guessing" below ~ 250hz and there were large differences from one mic to the next. But Studio Six has figured out how to bypass the phone's internal processing and/or filters to bring us a pretty awesome suite of tools.

Anyway, I decided to put it up against the Dayton EMM-6 using Room EQ Wizard (REW). This is a very popular DIY combo for the SQ crowd. The mic has been calibrated. My phone is utilizing the default calibration (meaning, I didn't do shit).

Top pic is the Dayton+REW (laptop based). Bottom is the $20 app on my iPhone6 using the internal mic. Both in 1/12 octave.



If you're not seeing much difference... that's the point I'm trying to make. And the only anomaly I can really see is the peak ~ 4khz on mine. And that very well may be the difference between FFT and RTA or a resonance between my headrest and the phone case.

Either way... we all know RTA is only part of the story, but it's a great way to *see* what you're hearing and I highly recommend this app to anyone who gives a shit what their system sounds like.

Also... here's the stock system in the Fiesta. Suck it.

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Old 12-07-2014, 05:52 PM
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What about us non iphag users? Lol
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Old 12-07-2014, 06:01 PM
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Originally Posted by e46inperrycounty View Post
What about us non iphag users? Lol
There is an app for Android that has similar functions but I can't comment on how accurate it is. Reports I've gotten say that it is, but I can't confirm.

It's also cheaper ($7.50), but it's a completely different company and I don't know if they can bypass the wind/pop filter of the internal mic. The guys I know who are using AudioTool for Android are also using this little mic.


http://www.amazon.com/Dayton-Audio-i.../dp/B00ADR2B84

AudioTool for Android

http://www.amazon.com/Bofinit-Corpor...7996891&sr=1-1
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Old 12-07-2014, 06:05 PM
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There's also a calibrated mic on partsexpress that plugs into the headphone jack. Maybe that would make it even better.
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Old 12-07-2014, 06:09 PM
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Think I'll be buying this soon!
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Old 12-07-2014, 06:19 PM
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Also... I just took for granted that everyone will know what they're looking at and how I arrived there.

Is that true? Or do I need to edit with a tutorial/explanation?
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Old 12-07-2014, 09:41 PM
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Impulse response (sweep) will give a different response than RTA (noise) because it accounts for the time domain. The reason you see more high-end response in the RTA is because you are adding together the source and reflected info. Below ~250hz the measurements should be about the same because you don't have any reflections in a car at those frequencies as the wavelength size is large relative to the cabin size. Errors between the two measurment types below ~250hz are usually caused by an inaccurate mic or bad (or no) calibration file, so seeing as how the response looks very similar between the two that's a testament to the calibration quality in the app.

Doing the same thing in Android would be very difficult, as you have to account for all the varying calibrations needed among many different phones.
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