By All Means...
Originally Posted by morpheus95
I may get flamed for this
but can you use Graphic Equalizers when you use headphones with an amp or is this a no no when using headphone amps ?
By all means... use one... if it will help you taylor the sound to your preference - its far, far more practical and cost-effective than "rolling" every other component in your signal path, until you achieve "your sound."
As far as "distortion" - you don't need to be overly concerned about distortion. You do want to find one, which adds no noise, or "abnormal artifacts." And... you may want to consider a "sound processor," rather than an "equalizer" - such as the Aphex 204 Aural Exciter, which is generally more satisfying and effective, with no noise.APHEX Systems 204 Aural Exciter® - Optical Big Bottom®
With regard to "distortion" - every component in the signal path (and their respective assembly components) from the mikes in the recording studio to your headphones adds some "sonic effect" to the sound, or "distortion" to the sound (other than THD) (e.g. mixers, recording devices, sources, amps, phones, cables, opamps, tubes, caps, diodes, resistors, etc.). You just need to decide whether you want to use one, and how you want to achieve "your sound."
Though, it is possible you could realize just a little less clarity, because of the added length to the signal path... and... if you can achieve your sound with out an equalizer, or sound processor, you may be more pleased. Of course the higher the quality of the equalizer / sound processor - the greater the clarity, and the less the noise, and THD.
I found the Aphex 204, especially effective to brighten the HD650s, and remove their "veil."