[LFF]

Quote:

Originally Posted by Tyll Hertsens /img/forum/go_quote.gif No, I'll be drilling small holes in people's head and peering in to see what's goin on in there while you listen to headphones.

You'd be surprised to see what is going on inside my head.

You don't want to know.

 

[rsaavedra]

Quote:

Originally Posted by LFF /img/forum/go_quote.gif You'd be surprised to see what is going on inside my head.

Green oranges?

 

[xnor]

Quote:

Originally Posted by Tyll Hertsens /img/forum/go_quote.gif I think it was Dread who asked about the effect of the chamber walls on open headphone acoustics, where reflections might get back into the cans and they certainly do. Just not a lot.

Yep, you can see those reflections in the impulse response.
Some interesting graphs you posted there, thanks!

 

[Tyll Hertsens]

Quote:

Originally Posted by xnor /img/forum/go_quote.gif Yep, you can see those reflections in the impulse response.

I don't think I posted any impulse response curves.

But it's a good idea, next time I do an impulse response curve I'll see if I can open the window far enough to see the reflection off the wall.

 

[xnor]

Quote:

Originally Posted by Tyll Hertsens /img/forum/go_quote.gif .

I should have written "you could see them in an impulse ...".

 

[Tyll Hertsens]

Ah! Cool.

I ran a complete headphone measurements series using HeadRoom's test procedure, It worked well. I'm going to do some fine tuning today and I'll post results.

If I've got time I'll see if I can run that impulse response out to see the reflection.

 

[Tyll Hertsens]

Suweet! The system is now running through the entire test sequence we use to upload measurements at HeadRoom.

I made pdfs of the measurement graph summary page on the spreadsheets.

You can see that the current measurements are as good or better than the ones at the office. Nice to be in a less noisy room.

Original D5000 measurement
Balanced D5000
D5000 measurement after we got new ears
D5000 measurements on new test set-up

 

[Jamey Warren]

Tyll,

Your graph links seem to be requiring sign in at google sites. Maybe these docs need to be made public to be able to view them?

 

[Tyll Hertsens]

Quote:

Originally Posted by Jamey Warren /img/forum/go_quote.gif Your graph links seem to be requiring sign in at google sites. Maybe these docs need to be made public to be able to view them?

Thanks Jamey. Thought I did that but I guess it didn't stick.

Can someone try to download again and let me know if it works?

Thanks.

 

[thisbenjamin]

.

 

[Tyll Hertsens]

Quote:

Originally Posted by thisbenjamin /img/forum/go_quote.gif works fine now, thanks.

 

[Anonanimal]

Great stuff so far. I'm looking forward to the measurements to come!

 

[xnor]

Well done Tyll.

V for 90 dB seems to be a bit off and I wonder why it varies so much between the measurements.
I think that adding a bit more foam will further improve the accuracy of the results! (Though it could get a bit too tight and hot for you in there.

)

Do you have any ideas why the square waves look so different?
And could you do the isolation response without headphones on the dummy head?

 

[barnaclebeau]

Another metric that I don't think anyone considers...consistency? Does one brand new pair of HD650's measure the same as another brand new pair? What if you only put hours on one pair, then A/B measurements would rule out changes in measuring tools and test environment. How about wood cups, like AH-D5000s? Are they consistent, being an organic material?

Once your test procedures are efficient enough to allow 'willy nilly' testing, I'd love to see what difference member's DIY mods make. You could be the definitive 'dyno tester,' to borrow from another DIY hobby. I'd make a reasonable donation to your non-profit to see how my rig specs out, I'm sure a lot of head-fiers would.

PS- Thanks for your contributions to the world of headphones. Even though I didn't make all of my purchases through Headroom, I've always referred to the data there when considering a new set of phones, comparing prospective purchases to things I already had. Matter of fact, it was Headroom where I read that my first headphones (senn HD250's) were "Big and light, but far too bright," kickstarting my pursuit of better cans to see what I was missing.

 

[thisbenjamin]

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