CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

Lobby => Headphone Measurements => Topic started by: ohhgourami on July 17, 2015, 07:19:36 AM

Title: Help! New measurement rig (ARTA)
Post by: ohhgourami 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.
(http://i.imgur.com/imLDZdOl.png)

Which produce measurements like this:
(http://i.imgur.com/thSZR6d.png)

When I set the cursor using the front portion of the impulse, the bass seems mildly scooped out:
(http://imgur.com/w8fCfAy.png)

What am I doing wrong?

Title: Re: Help! New measurement rig (ARTA)
Post by: ohhgourami 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:
(http://i.imgur.com/ehK2mKU.png)

Title: Re: Help! New measurement rig (ARTA)
Post by: firev1 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.

Title: Re: Help! New measurement rig (ARTA)
Post by: OJneg 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.