How much DC offset allowed in headphone amp? - diyAudio
 How much DC offset allowed in headphone amp?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 30th July 2003, 08:28 PM #1 diyAudio Member     Join Date: Mar 2002 Location: San Francisco, USA How much DC offset allowed in headphone amp? How much DC offset can a headphone voice coil take before the sound becomes degraded? I can trim my Aleph headphone amp to be within 1mV of ground when warmed up (this takes about an hour ... excessive heatsinking). How much DC offset does it take to actually damage headphones? Think Grado 30Ω cans here.
 4th August 2003, 05:43 PM #2 diyAudio Member   Join Date: Jun 2001 Location: Flanders, Belgium as long it's in the range of some millivolts, there isn't any problem I guess. Consider that some DC-protection circuits only work with a DC voltage of 1V or even more.... best regards, HB.
 5th August 2003, 12:15 PM #3 diyAudio Member     Join Date: May 2003 Location: Tampa, FL Anything below 10mV is perfectly fine for low-Z cans like Grados. 10mV into 32R (the nominal impedance of the Grados) is a paltry 3.1uW*. As your cans will probably withstand several hundred milliwatts of rms power before overheating, a few microwatts aren't going to hurt Tthe desire for low dc offset isn't so much a quest to keep the coils from overheating, it's more about maintaining as much dynamic range as possible. After all, the dc offset will push (or pull) the coil away from its resting position, reducing the total excursion in one direction while uselessly increasing it in the opposite. * - if you want to calculate this yourself, it's simply Ohm's law: P=(V^2)/R. If V is in mV, then P will be in uW.

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Dxvideo Headphone Systems 44 21st July 2007 09:35 AM cynric Headphone Systems 4 10th July 2007 10:42 AM tryonziess Chip Amps 6 13th May 2007 06:52 PM Rundmaus Tubes / Valves 11 16th October 2005 03:19 AM

 New To Site? Need Help?

All times are GMT. The time now is 04:22 PM.