For years, the Sony MDR-7506 headphones were in studios everywhere. I found them to be incredibly bright, but many of my friends used them regularly and loved them. I will say that I still own a pair, and even though the ear pads are a crumbly mess, they are operational and sound the same as they did 25 years ago. I cannot say that about all the headphones I have owned over the years.
The Sony MDR-M1 is the direct descendant/successor of the Sony MDR-7506, but with remarkable improvements. They have a closed-back design with 40 mm dynamic dome-type voice coil drivers, a neodymium magnet, a claimed frequency response of 5 Hz to 80 kHz, and an impedance of 50 ohms at 1 kHz – making them easily driven by nearly any device. I can listen to them comfortably, clearly, and with an impressive frequency response at the minimal setting on my Apple MacBook Pro. The set comes with two detachable cables that have 3.5 mm connectors. One is a little under four feet, and the other is over eight feet. A screw-on stereo 1/4-inch adapter is also included. The user-replaceable ear pads are synthetic leather, and the ear cups swivel for flat packing. Weighing in at 7.6 ounces, these headphones are extremely light and comfortable – so light that I couldn't imagine them sounding like much at all when I picked them up, but I was wrong. The MDR-M1s sound fantastic. The high end is smooth and pleasing to listen to, even for extended periods of time. The bass response is also impressive in a controlled but pleasant way. From Kendrick Lamar to Scientist dub mixes to Tycho to Blue Note recordings from the 1960s, these headphones delivered a pleasurable listening experience.