Sennheiser’s HD 650 has gone unchanged for 13 years ... The other potential issue is that, at an impedance of 300 Ohm, these headphones require a powerful amplifier to drive them to their ...

while impedance matches Sennheiser’s HD 600 and HD 650 models at 300 ohms. “With precision and power like no other and new sensitivity across all frequencies, listeners will hear details they’ve never ...

That’s how long Sennheiser’s HD 650 headphones have been around ... in this update is a lowering of the impedance, down to 150 Ohm, which means you now have a better shot at powering the ...

In this age of blink-and-you’ll-miss-them tech product cycles, we should be tipping our hats to Sennheiser’s HD 650 headphones ... And because impedance is at a lower 150 ohms, you should be able to ...

So, what's so special about the HD 650? Well, in one form or another, Sennheiser has been making the HD 600 line of headphones for nearly the last 30 years, and over that time, they've marked ...

Over the years, a number of new versions have launched, including the HD 650 and HD 660, not to mention the very latest version we are testing here; the Sennheiser HD 660S2 ... Impedance is 300 ohms ...