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Author Topic: Help! New measurement rig (ARTA)  (Read 632 times)

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ohhgourami

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Help! New measurement rig (ARTA)
« on: July 17, 2015, 07:19:36 AM »
Guys, I need some help with my measurement rig. Using a Focusrite and Dayton emm-6 mic with full version of ARTA. Using a pillow as coupler.

I get these funky impulse responses.


Which produce measurements like this:


When I set the cursor using the front portion of the impulse, the bass seems mildly scooped out:


What am I doing wrong?
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ohhgourami

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Re: Help! New measurement rig (ARTA)
« Reply #1 on: July 17, 2015, 07:52:55 AM »
Okay found out it doesn't like amp output so I need to use the line out on the ADC. Seems like I should not use the cursor.

Got this measurement after fixing those things:
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firev1

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Re: Help! New measurement rig (ARTA)
« Reply #2 on: July 17, 2015, 08:08:38 AM »
The resonances were not ideal when I tried myself but I have fairly decent results with a disc coupler with foam on top which I mass loaded with blu tac. Could you try that? I doubt a pillow would be ideal as well given the number of impulse reflections within the short time frame.
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OJneg

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Re: Help! New measurement rig (ARTA)
« Reply #3 on: July 17, 2015, 07:02:36 PM »
You want to use open cell foam like Marv and I do. Pillow is too acoustically reflective; you basically want something that will just hold the headphone in place.

If you have any speakers do some free field measurements to establish a base line. Or take a free field measurement of your headphone (not coupled to the any surface). Right now things look weird. Unless that's how your Hifimen actually sound, which would be surprising to me.
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