Sennheiser HiRes Audiophile Headphone (HD 660 S)

Product Information

Nonetheless, this can easily be alleviated by extending the headband all the way out and gently flexing the part that extends. The PRTF graph shows that these headphones don't interact with the pinna that much, and therefore show very little activation.

I have owned a couple of these Sennheiser headphones over the years, and not once have I had issues with their build quality. You would be hard pressed telling it apart from the similarly numbered Sennheiser headphones which is not. However, their bass lacks a bit of thump and is a bit muddy; they also sound a bit mid-rangy and forward. It's impressive how Fiio has considered the upgrade path for E7 DAC owners by integrating an iPod-style dock connector into the E9. If you're going to tout a product as being more useful in portable applications you should include a short cable in the mix.

With a crisp bass, excellent mid-frequency response, and a gentle, pleasantly natural treble, the HD 660S has an expressiveness that immerses you in every emotion and nuance of music. I found myself regularly flitting between my HD 580 Precision and the HD 660 S, and ended up preferring each for different recordings – my HD 580 for classical, well-recorded 70s rock and acoustic material, and the HD 660 S for noise rock, electronica, jazz or techno. I also used them in tandem with a range of kit including a Chord Mojo, TC Electronics BMC-2 and a Naim Uniti Atom.

To put it simply, it possesses an aggressive smack unlike the more forgiving, carefully carved treble we heard on the HD 660S. The Sennheiser representative said the HD 660 S will replace the HD 650 in the line-up, and the older model will be discontinued. stereo connector offers the audiophile-standard plug for connection to devices such as headphone amplifiers and A/V receivers, digital audio players, analog gear, and more. They are tighter than the similar HD 650, but on the upside, the microfiber-like fabric used on the cup padding is soft and feels nice on the skin.You could try GitHub - jaakkopasanen/AutoEq: Automatic headphone equalization from frequency responses for EQ presets for your specific model. This results in a clear and well-balanced reproduction of vocals and lead instruments, but with a bit of excess emphasis on the mid-range that can make them sound slightly forward.