They have a comfortable fit suitable for long listening sessions and last over 62 hours continuously. You can even use them wired in a pinch if you run out of battery. However, you'll only be able to receive audio via analog, so you can't use their mic. They have full audio and mic support via wired USB, though. They also have multi-device pairing, so you can simultaneously stay connected to your PC and smartphone.

Placing the headphones on my head, they have a comfortable yet secure clamping force. Additionally, on the underside of the headband is a thin piece of padding. This padding is coated in a soft rubber or silicone material. As a result, the headphones stay fixed in place. Earcups The low frequencies of the Sennheiser HD400S has a sub boost around what sounds like 30 Hz. As a result, it gives lots of wonderful energy to songs that utilize sub frequencies as methods of creating emotional impact. It does a great job of making the lows sound big without getting in the way or clouding up the low-mids. The soundstage of the Sennheiser HD400S had a nice feeling of contrast in the height and width domains. It had a strong phantom center, which contrasted well with instruments panned out wide. Additionally, the height felt tall and deep with the sub energy in my chest complimenting the difference in the brighter, airer parts of the high frequencies. The sense of depth was skewed a bit due to the high mid boost, but came through depending on how it the mix used soundstage. Although Sennheiser offers many cheap models, their better-sounding headphones tend to be more expensive than the competition. If you're an audiophile, you know this manufacturer as one of the key players in high-end reference headphones. They mainly produce these under one name:For example, when I was listening to the song Daydreaming by Middle Brother, the stringiness of the acoustic guitar felt emphasized over its body. Additionally, while the electric guitar had a sense of midrange, it leaned a bit toward the high mids. It was able to maintain its sense of harmonic complexity, but had a particular sense of clarity. For other genres, this may have felt somewhat thin, but for this genre it worked quite well. Lastly, the vocal sounded louder in the mix than usual, and stepped forward in the soundstage as well. High Frequencies The HD 400S offers great high frequency extension, bringing crispy goodness to percussion when listening to pop. At the same time, the highs steer clear of uncomfortable brightness. Testing out some violin solos in this range, there was a decent amount of transparency mixed in with a touch of smoothness. In the highest registers, there was minimal piercing or sibilance, so these cans work well for long listening sessions. Soundstage

Sennheiser also produces models for specialty uses, like the SPORT, which are In-ears with stability fins and an IP54 rating for dust, splash & sweat resistance. They also manufacture a line of TV headphones: The HD 400S features a one-button smart remote conveniently located on the cable, which allows you to control music and take calls with ease, and the sturdy folding design makes these headphones durable and compact enough to be taken anywhere. Sennheiser dynamic drivers deliver a well-extended sound response with dynamic bass. For example, when I was listening to the song Didn’t Cha Know by Erykah Badu, the high-hat had emphasis, but felt less chunky than usual. It was emphasized more toward the upper treble and octave. Additionally, the hand drum had a slightly different shape than usual, but maintained a good balance in the mix. Lastly, Erykah’s vocal had nice detail and had good audible air during the “oo”s and “hey”s. Soundstage With an inline mic and remote, the Sennheiser HD400S headphones are the perfect on-ear headphone match for your smartphone or tablet. Campfire Audio, Chord Electronics, Dan Clark Audio (formerly MrSpeakers), EAR Micro, Eleven XIAudio, Enleum, FiiO, FIR Audio, Focal, Focusrite, Fostex, Grado, HarmonicDyne, HeadAmp, Hifiman, JBL, Kefine, Kiwi Ears, Klipsch, LETSHUOER, Mark Levinson,

Material and construction

Sennheiser has done it again. The HD 400S performs well beyond its price range and is one of the better budget model headphones I’ve tried. It has very few bells and whistles and offers a simple means of listening that still delivers amazing clarity and quality. If you need a good first pair of headphones or need something that you can take out of the house, then the HD 400S is definitely for you. It becomes clear right from the first notes that the Sennheiser HD 400 Pro are detailed in the highs, but not annoyingly brilliant. The tonal harshness sometimes heard with other headphones is absent here. As is typical for open headphones, the Sennheiser have no annoying compression in the bass range. Nevertheless, they are by no means thin in the lower frequencies. Even the deepest sub-basses are easily perceptible. This is where the ultra-wide frequency range of their reproduction comes into its own.