Beyerdynamic recently introduced a new pair of top-of-the-line headphones, called the T1 Teslas. These showed great promise when we heard them at CES 2010, so naturally we phoned the people at Beyerdynamic and asked for a review set. We’ve had our test T1s for about a month, and have engaged in extensive listening.
Priced at $1295, the T1 is a semi-open back design. The T1 involves several departures from Beyerdynamic's standard practice. The driver is an entirely new design, with a multi-layer diaphragm, machined metal structure, and new magnetic geometry. The drivers are also placed at an angle to the ear, a strategy we've also seen with the Ultrasone Edition 8 and the Sennheiser HD800. The idea there is to capture some of the outer ear reflections that one experiences with live music and loudspeaker. But in the case of the T1, interestingly, Beyerdynamic’s engineers say their objective in the offset driver placement was to avoid creating reflections from the outer ear—the opposite of the objectives of other offset designs, it would seem. The earpads have been designed to reduce reflections as well.
Beyerdynamic says the new transducer in the T1 is the first model to break through the one-tesla level of magnetic flux density (hence the T1 designation for this model). Measured in tesla (T), magnetic induction is an indicator of the strength of the magnetic system in headphones (or other dynamic drivers).