Wireless headphones normally mean you're compromising on sound quality versus wired headphones. Normally. Audio-Technica's new ATH-DSR7BT are so committed to the highest possible Bluetooth sound quality, though, that they don't even have a 3.5mm wired headphone cable, nor anywhere to plug one in. These Hi-Res Audio over-the-ear cans are all about hi-fi wireless, with a unique speaker driver and amplifier setup that promises the best. Can they deliver?