Beyerdynamic offers a broad line of headphones, but it's the company's midprice and higher-end headphones that are sought after by audiophiles and record industry pros. Needless to say, some of these models, including the flagship $1,399 Tesla T1, will set you back some serious dough.
Introduced in 2010, the T1 has a closed-back design and features the world's most powerful headphone magnets. Those ubermagnets dramatically improve efficiency and lower distortion. Every subsequent Tesla model has had a closed-back design until the T90 reviewed here was released in June of 2012. It's the first open-back Tesla model.
That's a significant change, because an open-back design allows the user to more easily hear outside sounds and also produces more spacious stereo imaging than closed-back headphones. The end result is impressive. The T90 delivers extraordinary resolution of fine detail, and since it's unusually comfortable, it's a pleasure to wear for hours at a time.
The bad news is that while it may be about half the price of the T1, it's still expensive at around $650 online. The good news: it more than holds its own in comparison with $1,000 audiophile headphones.
Design and features
The T90 is a full-size, over-the-ear headphone. The center section of the outer earcups is covered with a textured grayish-brown fabric, which allows the user to hear outside sounds. Like every other open-back design, the T90's sound will be heard by anyone near you, so it won't be a great headphone to use in bed. The understated look is a marked contrast to the more typical high-gloss plastic sheen on Beats and other popular headphones. The T90 is hand-crafted in Beyerdynamic's plant in Germany.
The Tesla design strategy isn't just about using bigger or more powerful neodymium magnets; Tesla systems are optimized to minimize magnetic power losses that would reduce efficiency. With the Tesla headphones, a ring magnet encircles the driver; in more conventional headphones the magnet is smaller and contained within the driver.
Quality is first-rate, and when you hold a T90 in your hands it feels more solidly built and impressive than Sennheiser's considerably more expensive
The headphone has a much higher than normal rated impedance, it's 250 ohms, which hinders performance with portable devices and phones, but the T90 was primarily designed for home use with AV receivers and headphone amplifiers that can easily drive high-impedance headphones.