Which headphone is "best" is always subjective, and depends on a listener's tastes and intended use case. Here's some info that may help you decide which headphone is best for you:
The LCD-2 delivers audiophile quality, low-distortion sound that articulates the power and nuance of your favorite music. Continuous evolution and the addition of Fazor Technology has enhanced its transparency and overall performance. 70 ohms impedance.
The LCD-2 Classic comes with a new suspension headband, special glass-infused nylon rings, and features the wonderful, warm and laid-back sound signature of the original 70 ohm LCD-2 pre-Fazor drivers. A little more spacious sounding than the LCD-2 but with less specific imaging.
For the LCD2 Closed-Back, we’ve taken the very popular LCD-2 Classic and developed a special sealed earcup for increased isolation. Still has the slightly warm tonality of the LCD-2 Classic, but has a stronger bass presentation due to the closed back. This is very similar to the sonic differences between the LCD-X and XC. 70 ohms impedance.
Many say the LCD-X is the most neutral of the LCD Collection; they’re used by sound engineers and musicians to create the most accurate recordings. They do a great job of translating your mix to the real world. The X and the closed-back XC are sensitive enough to be driven directly by portable players like iPods, iPhones, and some of the better smartphones, but you’ll enjoy better sound with an external amplifier. Its impedance is 20 ohms.
Sharing the same transducer design as the LCD-X, the closed-back LCD-XC offers all the benefits of a planar magnetic design with increased isolation and greatly reduced ambient noise for a private and powerful listening experience. The XC remains far and away the best-sounding closed back headphone available, a truly immersive listening experience. Its impedance is 20 ohms.
The LCD-3 is a high-resolution headphone that always sounds musical and spacious, with powerful bass, an engaging midrange, and an extended top end. Its rich, vibrant sound has real scale and authority. It features a deep soundstage and reveals music in a very ambient way with exciting transparency and detail. You’ll find yourself emotionally connected to the artist and music. Pair it with a high-quality headphone or integrated amplifier for best results. Its impedance is 110 ohms.
The LCD-MX4 a perfect combination of the LCD-X and LCD-4 - it has the easy-to-drive diaphragm and voice coil of the LCD-X combined with the 1.5 Tesla magnetic force of the LCD-4. It has a different soundstage than the LCD-X or LCD-4 to help simulate a room’s ambience, and the sensitivity to be easily driven by any high quality headphone amp, mixing console or audio interface. Impedance is 20 ohms.
The LCD-4z is the easy-to-drive version of our previous flagship, the LCD-4. Features a 15 ohm voice coil, so it’s very easy to drive. Incredibly powerful bass, a rich midrange and an extended top end makes music come alive. Comes standard with magnesium rings and gold hardware, and is significantly lighter than the LCD-4. If you loved the sound of the LCD-4, but didn‘t have the amp to drive them, you can now get the LCD-4z and your problems are solved.
The LCD-5 is our current flagship planar magnetic headphone for good reason. It has an immense sound stage, shockingly accurate bass (which is flat to 5Hz!), with an engaging and powerful midrange that encapsulates voice and vocals like none other. It features a totally redesigned LCD chassis and driver construction for the maximum in comfort and sound quality with minimum fatigue, weighing a full 1/3rd less than the LCD-4. Our brand new Parallel Uniforce voice coil, laser etched on our nano-scale diaphragms, coupled with our Fluxor Magnet array offers immense driver control with almost zero distortion. Low impedance (14 ohms), but also lower sensitivity, so you'll want to pair them with a high quality amplifier to experience the thunder.