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
~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
... 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
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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
* 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
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:
http://www.diyaudio.com/forums/soli...amplifier-based-lme49830-lateral-mosfets.html
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:
http://www.diyaudio.com/forums/soli...amplifier-based-lme49830-lateral-mosfets.html
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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
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 ...
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 ...
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- A good Headphone Amp for AKG K240DF anybody? It's 88dB and 600ohm, Thank you.