Open-Back Reference Headphones with Minimal Discrepancy from Speaker Environment: Sennheiser HD 400 PRO

＜Lightweight Construction Free of Heavy Components＞

Upon unboxing, the first impression is just how light these headphones are: the HD 400 PRO weighs only 240g. While some on-ear models come in lighter, this level of weight is exceptional for over-ear headphones that cover the entire ear. Without any metal parts, the build’s dedication to lightweight design is immediately evident.

In audio gear, there’s often a correlation between weight and sound quality, so one might wonder if something so light could really deliver. So did I, however, any doubts quickly dissipate.

＜Open-Back Design Reduces Long-Wear Fatigue＞

Even high-quality headphones can become uncomfortable during extended sessions. In closed-back models, good sound often comes at the cost of increased pressure, which can lead to fatigue. While I’m a fan of closed-back headphones, trying open-back monitor headphones again was a revelation—minimal pressure and maximum comfort.

These headphones are so comfortable that, after long hours, I forgot I was even wearing them, staying fully immersed in sound crafting. At one point, I felt the need to double-check on speakers just to confirm the results, finally removing the headphones.

＜Forward-Tilted Driver Units＞

I believe three factors contribute to the HD 400 PRO’s seamless feel, closely resembling a speaker environment. While the lightweight build and open-back design are part of it, the third factor is the driver mounting technique.

Looking inside the ear cups, you’ll notice that the HD 400 PRO’s drivers are angled slightly forward. Although subtle, this small tilt significantly reduces the sense of disconnect from a speaker environment.

＜Dear Reality dearVR MIX＞

The HD 400 PRO can also be used with Dear Reality’s dearVR MIX plugin, which recreates a speaker-like experience in headphones. This plugin allows for mixing in an ideal room setup defined by Dear Reality, as well as playback checks in challenging environments, such as car stereos, living rooms, or kitchen while wearing headphones.

＜Selectable HD 400 PRO Compensation＞

The plugin’s Headphone Compensation feature adjusts EQ settings to match headphone characteristics, and HD 400 PRO is an available model. While the HD 400 PRO offers robust monitoring on its own, integrating it with dearVR MIX could expand its usability further.

The dearVR MIX plugin can be purchased directly from Dear Reality (separate from Sennheiser’s support), and inquiries must be directed to Dear Reality in English.

＜Solid Build Quality and Practical Features＞

Overall, the HD 400 PRO is meticulously designed for professional music production despite its lightweight appearance. The robust construction, including durable moving parts, provides peace of mind and ease of use, sometimes even more so than heavier headphones.

＜Two Interchangeable Cables Included＞

On a practical note, the HD 400 PRO includes both coiled and straight cables. This feature allows for versatility in use and easy replacement in case of damage, making the headphones a potentially long-lasting companion.