If you are not using a dedicated headphone amp or decent hifi amp you will be missing out on a lot, I have run my sennie 414 (real old school) straight from my MP3 player and also through a DIY valve headphone amp. the difference is like night and day and this will improve with better headphones as the impedance tends to be higher (around 300 ohms) on better phones and they need a bit of driving.
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