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My Measurement Rig Progress / Purrin Reveals All!

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kapanak:
Hello there :)

I am wondering if anybody here who does measurements is comfortable sharing some details or photos of what their baffle and coupler looks like, so I get a sense of where to start.

I have a miniDSP UMIK-1 for measurement microphone, and will be using REW V5.1 as the software. Just basic stuff.

I do have some headphones (HD800, Code-X soonish, Amperior, etc) that could be used to check generally where my measurement rig falls under.

I appreciate any and all inputs. I will use this thread to further develop my measurement rig.

Thank you!


Measurement Rigs

OJNeg: http://www.changstar.com/index.php/topic,2305.msg63430.html#msg63430
Marv: http://www.changstar.com/index.php/topic,2305.msg63273.html#msg63273
Stratocaster: http://www.changstar.com/index.php/topic,2305.msg63377.html#msg63377
Ultrabike: http://www.changstar.com/index.php/topic,2305.msg63270.html#msg63270

Why No Use of Ear / Pinna: http://www.changstar.com/index.php/topic,2305.msg63409.html#msg63409

Measurement FAQ: http://www.changstar.com/index.php/topic,2305.msg63865.html#msg63865

Marvey:
foam --> plastic plate (with hole) --> creatology foam with hole cut in for microphone.

* In the middle of the foam later, a piece of felt about the size of an ear. Without this piece, I found measurements too ringy. Covered completely with felt, I found measurements too damped. The felt the size of an ear also serves another function. Proper measurement of supra-aurals that rest of the ear.
* I use a strip of felt to simulate hair and sometimes another strip to simulate imperfect seal of the nape of the neck. Knowing to get a properly simulated seal is crucial.
* The hard plastic plate (use a CD) is a good bone simulator.photos in a bit...

AstralStorm:
This thread is interesting, I've been building an anthropomorphic gear out of silicone and modelling hard clay for some tine now, it's almost done. The ear canal mass load is missing yet, other than that it is already great.

Ear and ear canal are based on straight silicone moulds of my own, modelling clay is hardened to simulate cheekbone and a bit of other bone in a roughly correct shape. Soft silicone skin. Silicone foam siluates cheeks.

Microphone is Dalton EMM-6, not the greatest SNR but otherwise great.

No compensation done yet, we'll see, but it is close to Marv's measurements at least on HE-6 and Parasox (new) - drops near 3-5kHz.

I'll start publishing once it's fully done.

ultrabike:
In all cases I cut a tight hole to pass the mic through. The mic should be flush.

sponge --> flat kitchen drawer liner --> thin foam padding (leaky headphones)
sponge --> flat kitched drawer liner --> small circle of foam padding (closed headphone) - foam padding must fit inside the cup

The sponge holds the mic in place and reinforces no leakage through the liner hole. This works:

Sponge: http://www.homedepot.com/p/QEP-7-1-2-in-x-5-1-2-in-x-2-in-Extra-Large-Grouting-Cleaning-and-Washing-Sponge-70005Q-144/100173109

Drawer liner maybe substituted by anything that provides a flat surface. This surface provides seal (like a CD or whatevs).

Foam Padding is used to absob reflections as much as possible. Will do photos later as well.

Marvey:
pictures of my rig:

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