On 9/4/06, Jesse Lackey wrote: > Yes most are in that range, 25-35 ohms. However some higher-end ones > are much more - 300 to 600 ohms. Quite a different thing to drive these > without clipping, you need +-15V or more. (AKG 242, for example, are > 600R and used in studios). My understanding was that the higher impedance ones were meant to be used in parallel so that the effective impedance was brought back down to a lower value. Then again, I don't remember much of my training in this area, so I don't really understand why the higher impedance ones are subject to clipping with lower voltages? Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist