tag:blogger.com,1999:blog-7172143857693272648.post1009274029286249705..comments2024-03-27T17:02:00.437-07:00Comments on Audio Musings by Sean Olive: A Virtual Headphone Listening Test MethodDr. Sean Olivehttp://www.blogger.com/profile/17909033506833141612noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-7172143857693272648.post-2810880123693607922016-05-24T17:05:57.567-07:002016-05-24T17:05:57.567-07:00Dreyka
Yes, the insertion depth of the IEM will s...Dreyka<br /><br />Yes, the insertion depth of the IEM will shift the frequency of the first resonance but it occurs above 8 kHz. The question is does it matter in terms of perceived sound quality?<br /><br />We are presenting a paper at the upcoming 141 AES Convention in Los Angeles where we compare objective and subjective evaluations of real and virtualized IEMs. The intra-inter agreement among listeners in term of their preferred IEMs was very good which suggests that maybe this is not a huge issue. We carefully monitored and controlled leakage which I think is the biggest issue in closed cirumaural and IEM measurements (objective or subjective). Dr. Sean Olivehttps://www.blogger.com/profile/17909033506833141612noreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-73796628419934402692016-05-08T05:08:13.883-07:002016-05-08T05:08:13.883-07:00Hello Dr Olive and congratulations for you work
...Hello Dr Olive and congratulations for you work <br /><br />As an owner of an hd595(similar to HD518) I find their bass very weak. By "weak" I mean that even after eq correction you don't feel the pressure on your eardrum. There is no tactility. <br />Perhaps, this has to do with the openness of the design and it's respective inability to maintain high air pressure. This is depicted in csd measurements as very low resonance at low frequencies, if I'm not mistaken.<br />What do you think? Might this be the reason why the simulated Audeze LCD 2(aka 518) sounds thin(mid centric) compared to the original? What is the significance of resonances in general?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-47252955988111892772016-05-05T03:05:56.349-07:002016-05-05T03:05:56.349-07:00How are you equalizing IEMs and what IEMs are you ...How are you equalizing IEMs and what IEMs are you using? A deep fit IEM like the Etymotic is going to be different to the shallow fit that is much more typical for IEMs like the Sennheiser IE8.<br /><br />Wouldn't the different geometry of everyones ear canals and the different volume of air in each canal affect frequency response. With the shallow fit that is common for many IEMs the resonance from a sealed ear canal is around 7-8Khz.Dreykahttps://www.blogger.com/profile/16830264569911238435noreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-67506828400989101092016-04-25T03:32:08.707-07:002016-04-25T03:32:08.707-07:00I'd be interested to hear about whether there ...I'd be interested to hear about whether there are perceptual differences in soundstage between open and closed headphones when listened to in an anechoic chamber.<br /><br />It was partly discussed here:<br /><br />https://www.reddit.com/r/headphones/comments/4fv5ro/this_is_a_really_frustrating_hobby_when_speaking/d2e44c8Dreykahttps://www.blogger.com/profile/16830264569911238435noreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-87437397014581796422016-04-24T17:16:50.054-07:002016-04-24T17:16:50.054-07:00Hi Sean,
Do you think it is theoretically possibl...Hi Sean,<br /><br />Do you think it is theoretically possible electrostatics and planar magnetics exhibit less spatial variation is because the wavefront generated by these transducers is more uniform over the radiating area, thereby reducing variations in pinnae interactions?HYnoreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-26418249511581839832016-04-24T15:35:56.959-07:002016-04-24T15:35:56.959-07:00Hi Dreyka:
1. In the validation tests we used a S...Hi Dreyka:<br /><br />1. In the validation tests we used a Sennheiser HD518 circumaural headphone because it is open-back (controlled bass leak) and good repeatability in measured response on different listeners. While it's response doesn't meet the Harman target it is relatively smooth and extended making it a good candidate for equalization. We've also used the Sennheiser HD800 for the same reasons: very consistent response on different listeners, smooth and easy to equalize.<br /><br />The listeners in these tests were trained.<br /><br />I can't comment on whether magnetic planar or electrostatic's are more consistent but since they are open I suspect they would be good. The Stax SR009 has very low measured distortion so we've used that for virtualization experiments where we were interested in the audibility of distortion.<br /><br />We are currently doing some research where we are virtualizing IEM headphones and the preliminary results look very good. The key is controlling for leakage effects which we have managed to do by monitoring the response in the ear for leakage.<br /><br />The ideal headphone for virtualization has an extended flat smooth response (20 Hz to 25 kHz), no distortion, no leakage or controlled leakage, and a consistent response across all listeners. If you find such a headphone let me know :)<br /><br />Cheers<br />SeanDr. Sean Olivehttps://www.blogger.com/profile/17909033506833141612noreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-85390318535760843902016-04-24T12:07:23.568-07:002016-04-24T12:07:23.568-07:00What headphone was used to virtualize other headph...What headphone was used to virtualize other headphones?<br /><br />***<br /><br />Were these trained listeners?<br /><br />***<br /><br />Some headphones significantly change in frequency response based upon their position on the head. For example:<br /><br />http://www.innerfidelity.com/images/AudioQuestNightHawk2015.pdf<br /><br />Do planar magnetic and electrostatic headphones vary less in frequency response than dynamic headphones when moved around the listeners head? The innerfidelity measurements suggest that planars are more consistent in frequency response when moved around the head.<br /><br />http://www.innerfidelity.com/images/StaxSR009.pdf<br /><br />***<br /><br />Can this virtualization technique be applied to IEMs?<br /><br />***<br /><br />What is ideal in a headphone for virtualization?Dreykahttps://www.blogger.com/profile/16830264569911238435noreply@blogger.comtag:blogger.com,1999:blog-7172143857693272648.post-51191301692077334722016-04-24T07:17:33.452-07:002016-04-24T07:17:33.452-07:00Thanks Sean.
Do you think beam steering by using ...Thanks Sean.<br /><br />Do you think beam steering by using a phased array of multiple headphone drivers per earcup could potentially fix the pinnae and coupling effects?HYhttps://www.blogger.com/profile/09554047617720451370noreply@blogger.com