Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 26th October 2012, 05:18 PM   #1
spirey is offline spirey  United States
diyAudio Member
 
Join Date: Jun 2009
Location: Centennial, Colorado USA
Default A good Headphone Amp for AKG K240DF anybody? It's 88dB and 600ohm, Thank you.

The Headphone Amp for the AKG K240DF can be Tube or Transistor.
Attached Images
File Type: jpg AKG K240DF.jpg (24.7 KB, 294 views)
  Reply With Quote
Old 26th October 2012, 06:29 PM   #2
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
depends on how loud/how much headroom you think is needed

~110 dB max SPL before clipping is often fine, some audiophiles hold out for amps capable of driving thier headphones to 120 dB without clipping

for 88 dB 600 Ohms the 110 dB SPL mark requires ~ +/- 14 V, 23 mA - some "standard" monlithic op amps can reach these numbers but needs some care in choosing

to extend the max SPL before clipping to 120 dB requires ~ +/- 44 V, 73 mA - beyond the capabilities of standard op amps

least effort is to use audio power chip amps at this larger Vswing - still monolithic op amps but run from higher V supplies, come in power packages that can bolt to heatsinks

the output may be partially or completly Class A biased with a ccs or even simple added R to a rail

Quote:
Originally Posted by jcx View Post
... Class A, Bridged, dual monobolcks...

Forums - Head-Fi.org Community is an enthusiast site - with a diy sub forum

www.Head-Case.org -the obligatory spin-off "opposition site" of those critcal of head-fi's fanboyism and reputed commercial slant


Headwize is inactive but archived at HeadWize Library - Projects

you can still read/search the design/build threads for several popular diy projects

some diy project collections - now getting dated but useful links:

HeadWize: DIY Workshop > Current DIY Headphone Amp Offerings

and

DIY projects, kits - Head-Fi.org Community

Last edited by jcx; 26th October 2012 at 06:50 PM.
  Reply With Quote
Old 27th October 2012, 12:22 AM   #3
spirey is offline spirey  United States
diyAudio Member
 
Join Date: Jun 2009
Location: Centennial, Colorado USA
Thank you jcx.
* I wish I could build one with the specs you kindly recommend, but I'm only good with building speakers (amps at least for now - not yet).
* We should ask Nelson Pass to be kind enough and contribute a nice sounding Class-A Headphone Amp idea to the diyAudio Community. I'm probably not the only one that has difficult cans to drive. So many more music lovers are getting into Headphones these days, a secret we audiophiles knew many years ago.
Have a good weekend. Spirey
  Reply With Quote
Old 28th October 2012, 02:23 AM   #4
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
You could get up to +/-30Vdc rails with AMB's b22 headamp:

The β22 Stereo Amplifier

Which would let you hit jcx's +/-14V number.

OPC's "Wire" Class AB speaker amp goes up to +/-90Vdc rails and could hit jcx's +/-44V number. Can also be biased Class A like jcx mentioned. That group buy is closed, but maybe someone will have a completed one for sale at some point:

"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets

Last edited by agdr; 28th October 2012 at 02:46 AM.
  Reply With Quote
Old 28th October 2012, 05:23 AM   #5
diyAudio Member
 
Join Date: Jun 2004
Location: Connecticut
I'd bet "the wire" headphone amp (LME49990 + LME49600) would be enough for you even.

You can also look at the Gilmore Dynahi but isn't cheap, requires heatsinking.
  Reply With Quote
Old 28th October 2012, 05:32 AM   #6
spirey is offline spirey  United States
diyAudio Member
 
Join Date: Jun 2009
Location: Centennial, Colorado USA
Thank you all, I'm checking into the possibilities you suggested.
  Reply With Quote
Old 31st October 2012, 01:12 PM   #7
diyAudio Member
 
Join Date: Jun 2006
A tube OTL amp is is idealfor such high impedance headphones take a look at Crack OTL Headphone Amplifier Kit for an example this comes as a kit but you can find some more DIY oriented projects here DIY Projects Index | HeadWize
  Reply With Quote
Old 31st October 2012, 08:05 PM   #8
spirey is offline spirey  United States
diyAudio Member
 
Join Date: Jun 2009
Location: Centennial, Colorado USA
Thank You burgundr.
The Crack OTL DIY Headphone Amp ($279) looks like one of the best choices for my 600 ohm and 88dB AKG's. I think my search is over.
  Reply With Quote
Old 2nd November 2012, 11:04 PM   #9
diyAudio Member
 
Join Date: Jun 2006
You are most welcome
  Reply With Quote
Old 8th November 2012, 06:57 PM   #10
spirey is offline spirey  United States
diyAudio Member
 
Join Date: Jun 2009
Location: Centennial, Colorado USA
Default A Little 12AU7 Between Digital Audio & My Ears

Could not live without high-quality music for more then a few days, so my inner "audio equipment restless bug" got me on eBay... and I ended up with an Audioengine D1 ($169) that runs into a Bravo Audio V2 12AU7 Class-A output Tube HeadAmp ($66). They are running the AKG K240DF with plenty of authority. They grab the headphones by the balls, (-) a slight roll-off from about 40Hz. I found the V2 12AU7 to be a great addition with many useful possibilities. Happy Listening ...
Attached Images
File Type: jpg AKG K240DF, Bravo 12AU7 & Audioengine D1.jpg (422.7 KB, 151 views)
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
AKG K601 amp problems rho Headphone Systems 6 1st July 2011 09:46 AM
Pass project for 88dB speakers? A75? FATHER Pass Labs 5 4th May 2011 08:36 PM
T-AMP: with 88dB of sensitivity? Antigen Class D 7 3rd April 2011 08:00 PM
topping tp21 + 2x 88db speakers enough? GewoW Class D 4 7th December 2010 08:50 AM
AKG K271 Professional Studio headphone FOR SALE! cartman Swap Meet 0 17th July 2005 08:54 AM


New To Site? Need Help?

All times are GMT. The time now is 03:21 PM.


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