Beyerdynamic DT 900 PRO X Review - Open-Back Studio Headphones

Today we review the Beyerdynamic DT 900 PRO X closed-back studio headphones for critical listening, mixing & mastering. We'll also take a look at all the features of the DT 900 PRO X and tell you about the sound quality of this device. For 2021, Beyerdynamic is releasing the updated DT 700 PRO X and DT 900 PRO X professional headphones. The first model is traditionally closed-back, and the second is open-back. Both models are designed for use in and out of the studio. It would not be very reasonable to think that any pair of headphones can replace monitors. However, for a true specialist, the most important thing is good sound and reliability, and headphones will always be used.

In addition, the new STELLAR.45 headphones expand the range of applications considerably due to their low impedance of 48 ohms and high sensitivity. You can connect the headphones anywhere, the volume will be enough without a special powerful amplifier. As a reminder, the classic 770 and 990 models required a very high voltage swing, which is usually only possible with stationary amplifiers. Of course, any headphones will sound much better with a good source, amplifier or audio interface, so it's worth connecting them to good equipment if possible.

Are the new PRO X models suitable for audiophiles? If the high impedance of 250 ohms did not prevent you from using the headphones for any purpose before, it is even more so now. It is worth saying that the excessive professional brutality is gone and the manufacturer is trying to please a large number of users at once. Let's keep things in order and start our Beyerdynamic DT 900 PRO X review as usual with the headphones' specifications.

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Classic Package

Beyerdynamic DT 900 PRO X Specifications:

• Wearing style: Over-ear
• Ear pad material: Velour
• Transducer principle: Dynamic, open-back
• Sound coupling to the ear: Circumaural
• Driver diameter: 45mm (STELLAR.45 driver)
• Frequency response: 5 - 40,000Hz
• Nominal sound pressure level (@1mW / 500Hz): 100dB SPL
• Nominal sound pressure level (@1V / 500Hz): 114dB SPL
• Nominal impedance: 48Ω ohms
• Short-term maximum input power: 100mW
• Rated maximum input power (continuous operation): 30mW
• Total harmonic distortion (THD) (@1mW): 0.80% @ 100Hz | 0.05% @ 500Hz | 0.04% @ 1kHz
• Headband pressure: 5.3N
• Folding/collapsible: No
• Cable - Detachable: Yes
• Length and type of cable: 1.8m (5.9ft) - straight cable | 3m (9.8ft) - straight cable (each detachable, with 3-pin mini XLR cable connector, single-sided)
• Connection: Gold-plated mini stereo jack (3.5mm) & 1/4" adapter (6.35mm)
• Weight (without cable): 345 grams (0.76 lbs)
• Set includes: Beyerdynamic DT 900 PRO X unit, 1.8m straight cable, 3m straight cable, 2x 3.5mm (1/8") jack plug to 6.3mm (1/4") adapter, tight neoprene pouch (bag), stickers, bracelet, manual
• Made in Germany!

Overall Build, Design & Features

Unfortunately, we are not going to go into detail about the package, design, and ergonomics, as we have already covered all of this in detail in our review of the Beyerdynamic DT 700 PRO X. Yes, the Beyerdynamic DT 700 PRO X and the Beyerdynamic DT 900 PRO X have the same package, design, and even the same dynamic driver. The only difference is that the DT 900 PRO X are open-back headphones and the DT 700 PRO X are closed-back headphones. The sonic character of the headphones is also slightly different, but we'll talk about that later.