I was driving these with the OPPO BDP-105 internal headphone amp, which has more than enough reserve power and dynamic headroom to drive their 300 ohm impedance, and the OPPO has a neutral tonal spectrum that reveals details using the ESS Sabre32 9018 DAC

Note however they are 300 ohm impedance and need some power in the amp.

Just make sure your device can handle 300 Ohm impedance headphones

They are 300 ohm impedance, so they may sound veiled unless run through an amplifier which really opens them up.

sound great too, either plugged into the receiver or piped thru my logitec PC system (their top o line with separate headphone amp)

Id hold out for another crazy B&H or Adorama deal on

If you like a laid-back, really mellow phone with no personality, you might like these

I am etiher getting accustomed to the sound or they are improving as I use them more

In excellent condition as well--almost as if they were never opened :D Thank you!

So I looked at Sennheiser other phones as well as

and I absolutely love them months after purchasing just as much as I did the first day.

The HD650's may not have the fancy technologies of orthodynamic or electrostatic units, nor the pricey parts and accessories, but they definitely sound nearly as good and even better in some ways

I have found they sound marvelous with vintage Marantz receivers that can be obtained inexpensively, as well as from modern dedicated headphone amps