When it comes to mid-fi headphones, Sennheiser always gets a good rep – and with good reason.  From theHD600 on up, time and again we see people falling head-over-heels in love with their headphones.  But if you’re new to the Sennheiser lineup, and you’re debating on the Sennheiser HD650 or the HD700, which one do you opt for and why?  We’ve boiled it all down for you.

For my comparison review, I used the Beyerdynamic A20 desktop amplifier.  It’ll drive anything up to 600 ohms, and it has dual output, so I could drive both Sennheisers at once and switch between the two as I saw fit.  Personally, if I were listening to just one, I might pair it with the HifiMan EF100 for a slightly warmer sound, or for the always-impressive Chord Mojo.  Suffice to say, though, that the A20 is more than capable of handling both of these ‘phones, and with ease – even if the amp does add a little more contrast to the sound.
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https://audio46.com/sennheiser-hd650-vs-hd700-comparison-review/