The EH 150 and HD 202 have similar noise isolation characteristics. The EH 150 will give you an upgrade in detail and tighter bass response. Both are an outstanding value.

It depends on the quality of the extension cable. Most extension cables of decent quality (you get what you pay for) will not degrade the sound at a detectable level within 50 or so feet. After that first 50 feet, you can expect a loss of detail and volume with each cable you add or each few feet of cable extra.

These headphones are the recording studio standard-- they were created to exceed the recording studio's heavy demands.

Hello- The PXC models are always noise cancelling capable (they have NoiseGard inside them to reduce droning, low frequency rumble). The HD series is "Headphone-Dynamic", meaning they are all dynamic headphones that go on or around your ear. The eH series stands for "evolution Headphone", which was designed for musicians who are into recording, DJ work or mixing/editing. There are various differences depending on the need and sound quality desired, but you get what you pay for-- our lower priced models are an excellent value and a great way to get awesome sound without spending a fortune. As you move up the line, expect better sound, more accessories and other features such as NoiseGard, etc.