ultrabike
500+ Head-Fier
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Really interesting study. Thanks!
I'm wondering how you came up with the "perceived spectral balance" in slide 25.
For example HP4 clearly shows boosted bass and treble, but the perceived spectral balance looks like HP2.
Guessing game?
1 - Audeze LCD-2 (flat subbass extension, treble extension)
2 - AKG K701 (bass rolloff at 100 Hz, upward slope)
3 - AKG K550 (elevated bass but otherwise somewhat diffuse-field, 9 kHz spike)
4 - Bose QC15 (like 3, but not 9 kHz spike)
5 - Beats Studio (hole in midrange, sharp rolloff under 40 Hz)
6 - V-Moda Crossfade (hole in midrange, subbass issues, treble extension issues)
Wait, that's just the order they're listed, except I swapped 4 and 5. Beats Studio should be the one that rolls off sharply under 40 Hz.
• Small ears are typical of American and Euro-
pean females as well as Far-eastern males and
females
• Large ears have pinna sizes typical of American
and European males
I think Grados would measure quite a bit worse with the same ear simulator.
More questions to Mr. Olive regarding the measurements (GRAS 43AC with KB1060 pinna):
KB1060 is a small pinna described as:
Why not choose the large one:
And how was this whole construction calibrated?
That's good. So I assume the L/R measurements on slide 25 are raw, in other words not equalized.
What I always wondered is why headphone measurements don't use an equalization based on calibrated (flat) speakers at +/- 30° instead of free or diffuse field.
That's good. So I assume the L/R measurements on slide 25 are raw, in other words not equalized.
What I always wondered is why headphone measurements don't use an equalization based on calibrated (flat) speakers at +/- 30° instead of free or diffuse field.
The measurements are based on an average of 5-6 re-seatings. They aren't equalized in the sense that we haven't tried to remove the transfer function of the GRAS 43AG , which has nothing to do with free or diffuse field equalization.
What you are talking about is what the ideal target response curve should be for a headphone: diffuse field, free-field, something in between? There are many different thoughts on that but we are presenting a paper on this topic at the upcoming Rome AES where we tested several options.
P10-3 Listener Preferences for Different Headphone Target Response Curves—Sean Olive, Harman International - Northridge, CA, USA; Todd Welti, Harman International - Northridge, CA, USA; Elisabeth McMullin, Harman International - Northridge, CA USA
There is little consensus among headphone manufacturers on the preferred headphone target frequency response required to produce optimal sound quality for reproduction of stereo recordings. To explore this topic further we conducted two double-blind listening tests in which trained listeners rated their preferences for eight different headphone target frequency responses reproduced using two different models of headphones. The target curves included the diffuse-field and free-field curves in ISO 11904-2, a modified diffuse-field target recommended by Lorho, the unequalized headphone, and a new target response based on acoustical measurements of a calibrated loudspeaker system in a listening room. For both headphones the new target based on an in-room loudspeaker response was the most preferred target response curve.
Convention Paper 8867
The measurements are based on an average of 5-6 re-seatings. They aren't equalized in the sense that we haven't tried to remove the transfer function of the GRAS 43AG , which has nothing to do with free or diffuse field equalization.
What you are talking about is what the ideal target response curve should be for a headphone: diffuse field, free-field, something in between? There are many different thoughts on that but we are presenting a paper on this topic at the upcoming Rome AES where we tested several options.
P10-3 Listener Preferences for Different Headphone Target Response Curves—Sean Olive, Harman International - Northridge, CA, USA; Todd Welti, Harman International - Northridge, CA, USA; Elisabeth McMullin, Harman International - Northridge, CA USA
There is little consensus among headphone manufacturers on the preferred headphone target frequency response required to produce optimal sound quality for reproduction of stereo recordings. To explore this topic further we conducted two double-blind listening tests in which trained listeners rated their preferences for eight different headphone target frequency responses reproduced using two different models of headphones. The target curves included the diffuse-field and free-field curves in ISO 11904-2, a modified diffuse-field target recommended by Lorho, the unequalized headphone, and a new target response based on acoustical measurements of a calibrated loudspeaker system in a listening room. For both headphones the new target based on an in-room loudspeaker response was the most preferred target response curve.
Convention Paper 8867
a new target response based on acoustical measurements of a calibrated loudspeaker system in a listening room. For both headphones the new target based on an in-room loudspeaker response was the most preferred target response curve
I'm confused - does the Harmon paper indicate, then, that headphone users are seeking a flat frequency response?
The results provide evidence that trained listeners preferred the headphones perceived to have the most neutral, spectral balance.
Read the blog post linked on the previous page:
The correct order appears to be:
HP1: LCD2r2
HP2: K701
HP3: Bose QC15
HP4: K550
HP5: Beats Studio
HP6: Crossfade
Taking the perceived spectral balance plots into account some listeners had problems getting proper seal with the AKG cans. This would also explain how some reviewers say their K701 has enough bass ("bass-heavy" version*) and others say it is lacking bass.
*) The old "explanation" was that there are huge manufacturing variations leading to bass-heavy and light versions..