| Re: What sealed headphones - approx £30?
Headphone amps are designed to offer a better amplification of the signal to your headphones than is offered by the headphone socket on your amp. To be frank, you won't notice this advantage unless you have a very expensive set of headphones and player. And in all honesty, if you have that sort of set-up, chances are you'll have an equally expensive amp that will have a headphone output that is at worst only marginally inferior to a headphone amp. If you are going to listen to headphones a great deal, then a headphone amp may be a sound idea (once you have the kit to go with it), but if you're only going to listen sporadically, then it probably isn't a high priority.
The Sennheisers you mention are fine. I have a pair of Sony MDR-XD200 'phones that I use occasionally on the computer, and they give a perfectly respectable sound for the price (circa £20 at Argos). This is NOT meant to sound patronising, but don't expect miracles in this price range. You should hear some solid respectable sounds, but you won't get the wow! factor unless you spend a great deal more.
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