John Curl's Blowtorch preamplifier part II - Page 3477 - diyAudio
Go Back   Home > Forums > Member Areas > The Lounge

The Lounge A place to talk about almost anything but politics and religion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th February 2013, 11:50 PM   #34761
fas42 is offline fas42  Australia
diyAudio Member
 
fas42's Avatar
 
Join Date: Jun 2012
Location: NSW, Australia
Blog Entries: 11
Well, you've got me going now ... had a look over at HeadRoom: Headphones: Full-Size, In-Ear, Wireless, Noise Cancelling, Headsets at what they show, AKG 272HD vs. HD800 - same methodology in testing always gives one a head start (is there a pun there?) ! Everything there points to the Sennheiser being superior: flatness of FR, distortion, square wave handling, impedance load is an absolute doddle ... so what's going on?

The clue is the FR: the AKG's fall off a cliff at about 2kHz ... all the nasty high frequency stuff is nicely pushed into the background - apart from the massive 15dB spike at 10kHz, I wonder how a speaker with that sort of performance would go down ...

Frank
  Reply With Quote
Old 10th February 2013, 11:51 PM   #34762
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
Blog Entries: 3
It's a a Maxim 2222 or some such. Soic 8. There may have been a discrete version in the very first ones. I don't think those made it into production.
__________________
Demian Martin
Product Design Services
  Reply With Quote
Old 11th February 2013, 12:37 AM   #34763
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Hey, look what I've found! Pure gold! Next step, golden transformer substations. :-)

Click the image to open in full size.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th February 2013, 01:18 AM   #34764
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Default Auto-EQ the headphone -

One can take a low distortion headphone and using a probe microphone (which you can easily make that is flat) and an auto-EQ product, like used in recievers and stand-alone products by Audyssey and get this freq response:

Its a Monster/Beats product but any headphone will be flattened, automatically. The era of flat headphone FR is upon us! We can all have a flat FR... pick the headphone with lowest thd/IM and then flatten it for incredible sound!!! The flatter headphone you start out with the easier and lowest distortion results you will get.

And, it is fast to do so anyone's ear shape and size will be auto-EQ'ed for them.
Its all Done. Next problem, please.

Thx- RNMarsh
Attached Files
File Type: pdf Dr Dre Headphone EQ with Audyssey -2A.pdf (202.4 KB, 34 views)

Last edited by RNMarsh; 11th February 2013 at 01:26 AM. Reason: Why not auto EQ ?
  Reply With Quote
Old 11th February 2013, 01:25 AM   #34765
fas42 is offline fas42  Australia
diyAudio Member
 
fas42's Avatar
 
Join Date: Jun 2012
Location: NSW, Australia
Blog Entries: 11
Quote:
Originally Posted by RNMarsh View Post
One can take a low distortion headphone and using a probe microphone and an auto-EQ product, like used in recievers and stand-alone products by Audyssey and get this freq response.
Its a Monster/Beats product but any headphone will be flattened. The era of flat headphone FR is upon us! We can all have a flat FR... pick the ones with lowest thd/IM and then flatten it for incredible sound!!! And, it is fast so anyone's ear shape and size will be EQ'e for them. Its all Done.

Thx- RNMarsh
Thanks for that ... I was going to mention doing a little experiment: apply DSP to the recording being played through one headphone, say the HD800, to give it the same effective response as the AKG, to make everything fair, and then compare; also, do this in reverse, "hot" up the recording so the AKG replay matches the Sennheiser in response. I wonder what the reactions of listeners would be then ...

Frank
  Reply With Quote
Old 11th February 2013, 01:50 AM   #34766
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Auto EQ is cheap now and a stand-alone product could be easily made with dsp chip just for headphones. You dont need to do room averaging or anything like that. I found the volume in the ear/headphone cavity to be small enough to have constant pressure everywhere. So just slipping the probe under/between the headphone cushion and your head anywhere gives same results. Even a lame consumer could do it with a push of a button and a second later they being listening to the best sound he/she will ever have.

What are we waiting for? All the parts to do this exists and its easy now that I told you how and showed you the kind of results you can expect. This should (FR) become almost a non-issue with heaphones.

Thx-RNMarsh
  Reply With Quote
Old 11th February 2013, 01:53 AM   #34767
gerhard is offline gerhard  Germany
diyAudio Member
 
gerhard's Avatar
 
Join Date: Oct 2005
Location: near Stuttgart, south Germany
Quote:
Originally Posted by john curl View Post
I don't know the whole story, but the people I am supposed to have lunch with today, do headphones for just about everybody.
Oh, yes, and then all these rides to lunch in JB's Bentley...

We have a proverb here, that hits the nail verbatim:

Wes' Brot ich ess, des' Lied ich sing.

I'm unable to translate it without changing the meaning,
essentially it is that eating someone's bread makes one
his mercenary.

Bragging around that will not help one's credibility.

I'll leave it at this.

Gerhard


ok. I try it: I sing the battle song of those who's bread I eat.
__________________
Everything has been said already - but not yet by everyone. (Karl Valentin)
  Reply With Quote
Old 11th February 2013, 02:07 AM   #34768
diyAudio Member
 
Kindhornman's Avatar
 
Join Date: Aug 2012
Location: Los Angeles, California
Richard,
The automatic equalization of these headphones for frequency response will be a great thing as long as the price is low enough. What this doesn't do anything about is the actual sound of the membrane used in the headphone and the decay rate of the diaphragm. Just correcting the frequency response alone will not a great headphone make. The difference between a Mylar diaphragm and perhaps a metallic diaphragm or anything else would have to be looked at. I would be just as interested in the waterfall plots of decay time for these headphones as I would the simple frequency response curves. Anyone else have anything to say about the sound of any of these headphones after eq correction?
  Reply With Quote
Old 11th February 2013, 02:13 AM   #34769
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Please do not post embedded pictures (gizmodo, etc.) from other websites, link to them instead. Post deleted.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 11th February 2013, 02:16 AM   #34770
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Ok, just heard back from my friend whose first job when he was contracted was to "...fix the Beats by Dre headphone design so they actually worked and were shippable."

He confirms that Iovine and Dre "never had a thing to do with the engineering of the headphones."

Lots of other juicy stuff, but that's all I have permission to divulge right now.

se
__________________
The Audio Guild
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 08:06 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2