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Now I want to discuss what magnetic Planar design has over dynamic. Any input. With these two in mind. Thanks.
Dynamic drivers work using a cone with a moving coil at one end which sits within a magnet and have a soft moving membrane at the edge of the cone. The current your source puts through the coil creates a magnetic field which moves with/against the driver magnet, causing the vibrations which reproduce sound. The issue is that the cone, by its nature, can distort with extreme frequencies/amplitudes... we're talking about non-linear distortion... so an extreme exaggeration of this is fart-bass but generally speaking with mid-fi headphones upwards, you shouldn't encounter this issue unless the headphones are of poor quality/have poor implementation or are simply being overdriven.
Planars use a membrane with the equivalent to the coil 'printed' on the back of the membrane. This then sits between two powerful magnets called 'statters' which is why they are generally heavier but again, the current running through the thin circuit on the back of the membrane creates a magnetic field which moves between the statters. As the whole membrane moves this technology is less prone to distortion.
If we assume that the drivers in dymanics are of a good quality, without wanting to oversiplify the way these technologies work or the 'house sound' a manufacturer tunes their designs with, generally dynamic headphones are more capable of producing a more punchy bass and a 'dynamic' sound. Planars, on the other hand, produce less distortion and generally have far faster transients. With good implementation they convey more instrumental accuracy and a more layered sound (so less punch, more texture). The downside is that they generally have a smaller soundstage.
There are a couple of things which haven't been discussed in this thread which are: weight and power requirements.
Generally speaking planars require more power and are of a lower sensitivity than dynamic headphones. That said, the Hifiman HE400s is probably one of the easiest to drive planars on the market but it still requires a little more power than average and certainly benefits from amping unless your source (DAP, tablet, phone) is more powerful than average. Also, it weighs 350g, so bear that in mind if you're considering long periods of listening. It's not so heavy but still substantial.
The Meze 99 Classics are nice dynamic headphones are far lighter but have more clamp force and this is main comfort issue with it. It is quite a bit easier to drive though. The Meze doesn't require an amplifier at all and is certainly the more portable option as well as being closed should you decide to take it out with you. Personally I don't like the design for use outside though.
Right... I have to head off. I'll finish what I was going to say when I get back tonight.