Sennheiser HD 400S – Over-Ear Headphones with Smart Remote (Black)

What this product is

The Sennheiser HD 400S are over-ear, closed-back headphones equipped with a smart remote and a lightweight design. With an impedance of 18 Ω and a 3.5 mm angled jack, they are aimed at everyday listening and casual use, offering a compact option for mobile devices and home setups alike. The built-in microphone provides omni-directional pickup for calls, while the closed-back construction aims to minimise external noise intrusion.

How it performs on paper

On the technical side, the headphones report a frequency range of 18–20,000 Hz (headphones) with a nominal sensitivity of 120 dB SPL @ 1 kHz, 1 V RMS. The microphone specifications include a frequency response of 100–10,000 Hz and a sensitivity of 44 dB V/Pa. Total harmonic distortion remains under 0.5% at 1 kHz/100 dB, suggesting clean playback at moderate listening levels. The weight is around 217 g, which is light enough for longer sessions, and the cable length is 1.4 m, a reasonable reach for most desks and laptops.

What to know before you buy

If you prioritise simple, plug-and-play listening for daily use, the HD 400S offer a straightforward setup without the need for extra amplifiers. Their 18 Ω impedance makes them compatible with a wide range of devices, from smartphones to PCs. However, given the absence of mentions about built-in emphasis on bass or treble tuning, expectations should be aligned with neutral, balanced sound rather than a coloured profile. The closed-back design should help reduce ambient noise somewhat, but these aren’t noise-cancelling headphones.

What stands out

• Light and comfortable for everyday wear, with a compact build that’s easy to carry.
• Low impedance means decent compatibility with most consumer devices without extra gear.
• The included microphone supports calls and basic voice input, which is convenient for hybrid work setups.

What might not persuade you

• They don’t list active noise cancellation, so outside noises may still intrude in busy environments.
• The emphasis appears to be on a balanced, generalist sound rather than any strong emphasis on bass or analytical detail.
• Without explicit mention of premium materials or reinforced cables, long-term durability in rough handling scenarios is not fully confirmed from the data provided.

Who this is for

These headphones suit someone who wants a simple, portable listening option with a built-in microphone for calls and online meetings, and who values compatibility with a wide range of devices over aggressive sound profiling. They’re a sensible choice if you’re looking for a budget-friendly pair that can double for music and video calls without fuss.

Who it isn’t for

If you crave a highly specialised sound signature (e.g., booming bass, studio-grade accuracy, or top-tier wireless performance), or if you need true noise cancellation for train commutes, these may not be the best fit. Additionally, if you require rugged build quality for travel in busy environments, you might want to explore models with more robust construction or dedicated cables.

When does it make sense to buy

Purchase makes sense when you want a straightforward, value-for-money pair of over-ear headphones with a mic for everyday listening and remote work, without the complication of extra features or premium pricing. They’re particularly convenient if you own multiple devices with a 3.5 mm jack and prefer a lightweight profile for extended use.

What to review before buying

Check whether your primary use is calls, casual listening, or mixed media consumption. Confirm that your device provides a compatible microphone input and that you’re comfortable with a wired connection. Consider how important external noise attenuation is for your setting and whether you’re satisfied with a neutral sound presentation rather than a more colourful tonal emphasis.

Practical usage note

A typical in-use scenario could be listening to a playlist during a short commute at moderate volume, then pivoting to a video call on the same headphones without swapping gear. The 1.4 m cable length suits a desk at home or in the office, though it may feel a touch short if you’re far from your device.

Tech specs (summary)

• Impedance: 18 Ω
• Frequency response (Headphones): 18–20,000 Hz (-10 dB)
• Sound pressure level: 120 dB (1 kHz/1 Vrms)
• THD: <0.5% (1 kHz/100 dB)
• Cable: 1.4 m, 3.5 mm angled plug
• Weight: 217 g
• Microphone: Omni-directional, 44 dB V/Pa
• Pick-up: Dynamic transducer, closed-back

FAQ

• Do these headphones cancel noise? Not actively, they offer passive isolation typical of closed-back designs.
• Can I use them with a phone? Yes, provided the phone has a compatible 3.5 mm jack or you use an adaptor where needed.
• Is the microphone good for calls? The omni-directional mic is suitable for typical calls, but performance will depend on the environment and your device’s input quality.

Is it worth it?

Worth considering if you want a lightweight, budget-friendly pair with a straightforward wired setup and a built-in microphone for calls. If you require a strong bass response, rugged travel build, or wireless convenience, you might want to explore other options.