Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: running 300ohm headphones from set amp speaker out posted by jjhaz on September 23, 2014 at 12:54:16:
See:
http://www.AudioAsylum.com/audio/general/messages/253385.html
The Rod Elliot circuit assumes that it is VERY important to maintain a 120 ohm output impedance, and my own experience has been that this is NOT necessary, and in fact, will actually degrade the sound coming from almost all headphones.
Diaphragm resonances and related issues, make having a lower output impedance quite helpful.
His circuit also sends the signal through TWO series resistors, which effectively doubles the damage done by the quality (or lack thereof) of the resistors.
I have received a lot of very positive feedback over the years about the circuit I recommend, and the only negative (one) was a gentleman who ignored the warning about amps that do not allow a common ground connection between the L and R channels. He damaged his power amp when he connected the circuit and turned it on.
It should be noted that the same warning is given at the Rod Elliot article, for the same reason.
Jon Risch
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Follow Ups
- Alternative circuit - Jon Risch 20:33:22 09/24/14 (1)
- RE: Alternative circuit - jjhaz 05:48:51 09/26/14 (0)