CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

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Author Topic: My Measurement Rig Progress / Purrin Reveals All!  (Read 6968 times)

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kapanak

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #20 on: April 17, 2015, 09:19:46 AM »
Quote from: MuZo2 on April 17, 2015, 08:58:44 AM
I think the distance should same like head size right?

No reason for that as long as you get a good seal. Also, where would you fit the mic unless you were doing 90 degrees measurements.
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MuZo2

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #21 on: April 17, 2015, 09:22:38 AM »
The measurement changes drastically with clamping force.
Same like with different pads.
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tomscy2000

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #22 on: April 17, 2015, 09:24:58 AM »
In radiology and rad-onc, we use dummy heads that simulate tissue densities all the time, in order to measure penetrance of our therapeutic rigs. The dummy heads themselves range from really rudimentary ones made from plastic and different densities of liquids and foams, to realistic ones that use very true-to-life silicone that simulates the absolute density of epidermal/dermal, and then musclular tissue, as well as skeletal tissue.

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tomscy2000

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #23 on: April 17, 2015, 09:29:26 AM »
The important part is to make sure to keep Snell's Law in mind as sound energy converts from media of air to tissue to bone and back to air before it gets to the "eardrum" or rather, the capsule of the pressure mic. The refracted energy needs to undergo an appropriate amount of overall loss.
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firev1

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #24 on: April 17, 2015, 01:25:18 PM »
Dunno why it never occured to me to make it out of a biscuit tin rather than just a CD. Much more convenient and easier to build.
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tomscy2000

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #25 on: April 17, 2015, 01:38:50 PM »
Totally misread that as "biscuit" and not "biscuit tin"...
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Sorrodje

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #26 on: April 17, 2015, 02:08:31 PM »
Here in
Quote from: tomscy2000 on April 17, 2015, 01:38:50 PM
Totally misread that as "biscuit" and not "biscuit tin"...

Here in France we're used to use cheese in our measurements rigs. does wonder to avoid nasty artefacts in treble area.



Biscuit should give good results too.
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Marvey

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #27 on: April 17, 2015, 02:38:22 PM »
Quote from: MuZo2 on April 17, 2015, 08:14:53 AM
Nice for positioning the headphones right.

purr1n looking at the headphone on your rig, isnt it too stretched and too much pressure?

It's the same width of my head. I think it looks a little stretched once headphones are put on it and the angle of the photo.
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Jamey Warren

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #28 on: April 17, 2015, 03:19:46 PM »
Nice Purrin! I appreciate you sharing the info about your rig.

Just wanted to add that I've been using the Dayton UMM-6 with some good results as well with a jig that Tyll loaned me.

Felt ears work well but I'm also considering ordering some artificial ears. Seen some cheap ones on eBay but also some nice ones from 3Dio:

http://3diosound.com/index.php?main_page=product_info&products_id=44
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ultrabike

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Re: My Measurement Rig Progress / Purrin Reveals All!
« Reply #29 on: April 17, 2015, 03:37:00 PM »
You could check these out:

http://www.amazon.com/Thumbs-Up-UK-Headphone-Cable/dp/B0082C4GOE/ref=sr_1_7?ie=UTF8&qid=1429284843&sr=8-7&keywords=earphones+tidy

May need to make a hole in the middle of where the canal should be. I've done it and FWIW it fits my mic.
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