Quote Originally Posted by Sensimilia View Post
Things get a lot more complex with headphones. The 1st and 2nd opamp types can have a dramatic effect. I like the THS4032 in the LIne and the LM4562 in the headphone for the K701. For the HD650 I prefer the LM4562 in both location. My MDR-F1 is happier with LM4562NA in LINE and NE5532FE in headphone.
So you're saying that the line opamp can have an effect on what sound the built-in headphone amp produces?