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Umm, that's one opinion I guess, I've heard others. Certain amps pair better with certain headphones. Certain Opamps are suited to certain amp/headphones as well from what I've gathered. Some will emphasize the highs, others create a warmer signature. So anybody else have thoughts on an Opamp for the Matrix and HD650?
OPA827 has slightly emphasized treble, might give you the difference you want, though I would suggest a different headphone altogether. Soldering will be required with OPA827. The slight bass and treble emphasis OPA827 bears makes the mids slightly laid-back, I don't know if that might veil HD650.
If using a computer as source, I recommend using the Sonnox Oxford EQ and/or Softube Trident A-Range EQ. These are excellent and won't distort the sound so easily plus you can EQ down those annoying middle ear resonances. If you boost frequencies too much, you'll start to get distortion of course but you can just reduce the output qith the output knob in the plugin to avoid distortion. Great examples of how good equalizers can be.