Why exactly these earpads need to seal, given that the K812 is open-back – I don’t know. The K812’s earpads are covered in what looks and feels like a nice soft pleather, and AKG’s unique design has the bottom of each earpad at least 5mm thicker than the upper part, which should help them seal better to heads that taper off rapidly below the ears. The connection to the left earcup is a ‘LEMO’ connector, with 3 internal pins that remind me of XLR’s (but smaller). The K812 cable is also nearly twice as thick as the Beyer DT1350 cable. ![]() I read somewhere where the K812 cable was described as thin or very slender, and while it’s certainly thinner than the Beyer T1 cable, it’s also much, much thicker than cables with many portable headphones such as the Bose models, or the B&W P3 or P5. The good news is that very large ears should fit the K812 just fine. Going the other direction, the adjustments to smaller heads are at most 10mm on each side. The earcup adjustments will fit heads that are only slightly larger than my average head. The K812 earcups are huge and the sonics are equally large – most decent stereo recordings should present a great soundstage, although if the slightly forward character of the sound coincides with music tracks that are recorded close-up or have been remastered for the ‘Loudness Wars’, that combination may have users turning the volume down to compensate. In spite of all this, I find the K812 to be more exciting, or more interesting than either Beyer headphone, and that may be due to its peculiar colorations, or the sonic roughness that I usually assume is a negative quality. The K812 has the big sonic presentation, but the T90 is potentially less fatiguing (just an impression). The T90 seems a little smoother, but the K812 has more detail. However, the T90 and K812 do make a good comparison in terms of sonic tradeoffs, despite the large price difference. ![]() Comparing the T90 to the K812 isn’t as useful, since the K812 has a much more impressive soundstage and sense of detail, albeit that some of that detail is exaggerated. Features, specifications and appearance are subject to change without notice.Listening to the T1 for awhile and then switching to the T90, I get an immediate impression that I’m hearing a lower-quality headphone, and it isn’t subtle. AKG is a trademark of AKG Acoustics GmbH, registered in the United States and/or other countries. ![]() © 2015 HARMAN International Industries, Incorporated. 8400 BALBOA BOULEVARD, NORTHRIDGE, CA 91329, U.S.A. input power Cable Connector Adapter Net weight Item number: Premium wooden stand for proper storage included Open back, circumaural, dynamic headphones 110 dB SPL/V 5 Hz - 54,000 Hz 36 Ohms 300 mW 3 m / 9.85 ft, 99,99% oxygen-free with genuine LEMO connector 3.5 mm (1/8”) 3.5 to 6.3 mm (1/8” to 1/4") 390 g / 13.8 oz (without cable) K812 3458X00010 AKG ACOUSTICS GMBH LAXENBURGER STRASSE 254, 1230 VIENNA/AUSTRIA AKG ACOUSTICS, U.S. Type Sensitivity Frequency range Rated impedance Max. The K812 was also designed for long mixing or listening sessions: An open mesh headband and 3D-shaped slow retention ear pads ensure maximum comfort that will let you forget that you have the K812 on your head. With the 1.5 Tesla Magnet System and an ultra-lightweight two-layer voice coil, these headphones deliver an accurate imaging and pure, natural sound. HIGHLIGHTS » Powerful 53mm transducers enable highest in-class headroom » Sophisticated open-back technology reduces reflections for accurate imaging and natural sound » 1.5 Tesla Magnet System provides the most accurate and powerful experience possible » Ultra-lightweight two-layer voice coil for superior impulse response and extended frequency range up to 54 kHz The AKG K812 Superior Reference Headphones carry 53mm transducers - the largest AKG has ever used.
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