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Beyerdynamic DT 700 Pro X & DT 900 Pro X

Headphones By Phil Ward
Published June 2022

Beyerdynamic DT 700 Pro X & DT 900 Pro X

How do Beyer’s new studio cans compare with the competition?

In his review of the Sennheiser HD 400 Pro headphones back in February (https://sosm.ag/hd-400-pro), Sam Inglis mentioned a direct competitor, in the form of the Beyerdynamic DT 900 Pro X. And as if by magic, I now have a pair of said Beyerdynamic headphones in my review sights, along with their closed‑back sibling the DT 700 Pro X. To complete the circle, I also have Sam’s review pair of Sennheiser HD 400 Pro, as well as a pair of Sennheiser HD 650s, for reference and comparison. It’s in danger of looking more like a headphone party than a review.

The open‑back DT 900 Pro X and closed‑back DT 700 Pro X are very closely related. Not only do they retail at the same price and incorporate the same newly developed 45mm‑diameter ‘Stellar.45’ driver, they share the same mechanical design and much constructional and material detail. And one of the first things that strikes about them is the high quality of those constructional materials and details. There’s something grown‑up and professional about their use of metals rather than plastic, for instance, and where components are plastic, their silky black finish is good to the touch and faultless in appearance. Unusually at the relatively affordable price level, the DT 900 Pro X and DT 700 Pro X are manufactured in Europe rather than the Far East. There’s also a good‑quality feel about the accessories supplied and the entirely recyclable cardboard packaging, too. Those accessories I mentioned include 1.8m and 3m cable options, a drawstring travel bag and a 6.3mm to 3.5mm jack adaptor. The cables, while I’m in the vicinity of that subject, attach to the left earcups using a smart, locking mini‑XLR‑style plug and socket. Beyerdynamic say that almost all of the headphones’ components are replaceable.

The possible downside of heavyweight construction is just that: heavy weight. The DT 900 Pro X and DT 700 Pro X are, respectively, 105g and 110g heavier than the Sennheiser HD 400 Pro, and in the context of a pair of headphones, that is a big difference. Having said that, there’s a lot more to headphone comfort than weight, and I’ll get around to discussing how the DT 900 Pro X and DT 700 Pro X feel on the head a little further down the page. In the meantime there’s some more technical description to cover.

The closed‑back DT 700 Pro X.The closed‑back DT 700 Pro X.

Specs

The DT 900 Pro X and DT 700 Pro X are of course simple wired passive devices, and sharing the same driver means they boast the same published technical spec in terms of impedance, sensitivity and frequency response. The ‘Stellar.45’ driver, say Beyerdymanic, incorporates a three‑layer sandwich‑construction diaphragm, the filling of which comprises a damping layer. The diaphragm is driven by a neodymium‑iron‑boron magnet and copper‑clad aluminium voice coil. One of the most important numbers in the DT 900 Pro X and DT 700 Pro X specs is the headphones’ nominal 48Ω impedance, because that partly defines how easy or difficult they will be to drive. Forty‑eight Ohms is on the slightly low side of typical, which suggests good headphone sensitivity; considering that they’re intended for recording and mixing duties where they will most likely be driven from a DAW interface headphone amp, it is a good compromise. Having said that, I’d be slightly wary of using the DT 900 Pro X or DT 700 Pro X with an elderly smartphone or laptop that has limited current delivery and/or a high output impedance.

Diagram 1: The measured impedances of the Beyerdynamic DT 900 Pro X and DT 700 Pro X (purple and red, respectively), and Sennheiser’s HD 400 Pro (blue) and HD 650 (brown).Diagram 1: The measured impedances of the Beyerdynamic DT 900 Pro X and DT 700 Pro X (purple and red, respectively), and Sennheiser’s HD 400 Pro (blue) and HD 650 (brown).

Speaking of headphone impedance, as with that of passive monitors, it varies significantly across the audio band. This is no great surprise, as the fundamental architecture of...

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