Review on Sennheiser HD 660 S: Ultimate Hi-Res Open Back Headphone for Audiophiles by MoonSe Hoon ᠌

All potential users need to pay attention to the marketing tricks of manufacturers. In particular, 150 ohm impedance compatibility. I will give my experience: Fiio X5 III source - the manufacturer claims support for 150 Ohm, Sennheiser also claims support for portable players - in practice, the player with this product plays loudly, BUT the sound is comfortable only up to 1/3 of the volume, then it becomes "hard" and unpleasant due to the growth of distortions generated by insufficient power of the portable source and amplification path. The next step - we connect the headphones to a stationary receiver (in my case, Denon) - this is where the soul opens up, the drive begins and those goosebumps begin to run through the body more often :)) Conflicting reviews on the forums are often due to errors in the selection of the audio path and the quality of the original compositions (among Audiophiles have a different story, their taste preferences are included, don’t say it, but ears are an individual thing). Once again, I draw your attention - Sennheiser HD 660 S require full amplification and a good sound source (otherwise "money down the drain"). Listen, compare and you will be happy :)