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for $250 (excluding postage and possible custom and post office fees) you could go for the ibasso d1 pretty much the cheapest amp/dac combo WITH opitcal in. It gets a fair amount of love on head-fi.org and their amps look to be solidly built.
I am going for a d1 when my wallet recovers.
Can be used on its own, or in conjunction with another amp, so the optical in is dealt with by the dac then you can either connect your headphones to that and the amp section will kick in, or connect it to another amp to utilise that amp after the d1's dac has done its business. (dac = digital to analog converter)
That should be a very nice rig, but some say the hd650 require a very powerful amp, certainly a home amp, I have never listened to a hd650 out of a portable, but, I personally feel the headphone should be alright out of a portable, its just that for it to sound its best a good home amp is needed.
Just as an aside, if you were interested in branching out into home set ups, I would take a look at the little dot amps as an introduction to home amps (if and when you feel ready to lay down more money check out graham slee gear, apparently his solo home amp was produced with the sennheisers in mind, and apparently sennheiser use his solo amp at trade shows etc. Another wallet denting purchase I can see in my future... lol
Good luck with it anyway, I have recently discovered the h120 and it is an amazing player, even more so when you realise how many years ago it came out.
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