gaplessophile
Head-Fier
- Joined
- Aug 23, 2005
- Posts
- 86
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- 10
In a cmoy amp I recently built, I tried putting a resistor (per channel) in series with the output jack, after seeing that idea mentioned on this forum. With my low impedance (16 ohm) Shure e2c's, this effectively bumps up the impedance that the opamp sees the headphones as, making it easier for it to supply enough current. The result is a fantastic improvement in sound quality on my e2c's, and a fair improvement on my MS-1's (32 ohm).
I was wondering, how would this technique compare to a buffered amp design? And are there any negative effects of putting a fairly high value resistor here? I'm using 470 ohm ones, I picked such a high value to also make the output of the amp quieter with my low impedance phones. I suppose since bumping up the impedance means you have to turn your amp's volume up higher to get the same volume in your headphones, the amount of voltage your amp requires increases, but I've found a 9V battery to still be more than sufficient.
Any thoughts, anyone?
I was wondering, how would this technique compare to a buffered amp design? And are there any negative effects of putting a fairly high value resistor here? I'm using 470 ohm ones, I picked such a high value to also make the output of the amp quieter with my low impedance phones. I suppose since bumping up the impedance means you have to turn your amp's volume up higher to get the same volume in your headphones, the amount of voltage your amp requires increases, but I've found a 9V battery to still be more than sufficient.
Any thoughts, anyone?