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

kapanak · « **on:** April 16, 2015, 09:07:16 PM »

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 · « **Reply #1 on:** April 16, 2015, 10:54:56 PM »

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 · « **Reply #2 on:** April 16, 2015, 11:13:38 PM »

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 · « **Reply #3 on:** April 16, 2015, 11:14:29 PM »

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 · « **Reply #4 on:** April 16, 2015, 11:28:04 PM »

pictures of my rig:

Hands · « **Reply #5 on:** April 16, 2015, 11:37:20 PM »

LOL, nice! Can we get pics from the side to get a better look at the coupler?

Marvey · « **Reply #6 on:** April 16, 2015, 11:45:49 PM »

I know, I know, I should have posted pictures of my "semi-secret" measurement rig long ago. Many people, including Jude as recently at the Ann Arbor meet, have gone on rants regarding my not posting photos of my measurement rig or refusal to discuss my methods. I agree that this criticism is totally warranted. In my defense, I had my own myriad of reasons. Those close to me know exactly the reasons why I refused to post until now.

Quite a few Changstar members have figured out their own methods with great consistency and repeat-ability. The time is now right.

Here you go Hans:

I actually have a newer coupler with pinna, et. al. but still using this old V2 for sake of comparability to existing measurements.

kapanak · « **Reply #7 on:** April 17, 2015, 12:21:20 AM »

I highly appreciate all the great information and photos Marv and Ultra! I think I can use these as my reference in approaching a solution for my rig as well!

And absolutely hilarious naming XD

Out of curiosity, is the inside of the enclosure filled with anything? Cotton wool or similar material? Would that even have any effect on the measurement?

Thank you all so much

Marvey · « **Reply #8 on:** April 17, 2015, 12:31:20 AM »

I filled the inside with medium density open cell foam - to simulate brains. Use something squishy to avoid interactions between L and R.

Really, you could just put the felt / foam layer on top of a CD on top of a foam brick. I just made it look nicer and named it C.U.N.T. to establish "cred". We all know that stuff that looks nice, that is shiny white, and has a euro kind of acronym like G.R.A.S. or C.U.N.T. must be good.

Armaegis · « **Reply #9 on:** April 17, 2015, 04:09:02 AM »

If you replace the word technology with machine, the abbreviation makes more sense...

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

kapanak

My Measurement Rig Progress / Purrin Reveals All!

Marvey

Re: My Measurement Rig Step 2: Baffle and Coupler Options

AstralStorm

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

ultrabike

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

Marvey

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

Hands

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

Marvey

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

kapanak

Re: My Meas. Rig Step 2: Baffle and Coupler Opts / Purrin reveals all.

Marvey

Re: My Measurement Rig Progress / Purrin Reveals All!

Armaegis

Re: My Measurement Rig Progress / Purrin Reveals All!

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