I'm not sure any head phones are going to completely isolate you from a cranked amp that's in the same room as you but I bought my Sennheiser HD 280 Pro's for just that reason and they do a very good job. The best I've come across anyway.
A lot of people are touting the Sennheisers and I have no reason to doubt them, but I use Fostex T-50s because I know them and I hear exactly what I need to hear. They're about $100. Most studios I frequent use T-20s which are slightly cheaper but IMO not as true. T-50s also don't leak sound, while T-20s leak a little bit.
There is a company that mods the kind of protective headphones people who work around jet aircraft wear, to reproduce audio. I once saw it on the web, but I don't remember where.
I don't know of any other closed headphone that will seal out the noise of a cranked amp. The drummer I most often hire in my studio uses a combination of earplugs and very loudly cranked headphones. Sounds weird, but it works for him.
I think EQ mag did a review of the Ultrasones a while back.
I noticed better mixes when I started using Senn K271 phones, not because they sound better, but they translate very well to the monitors I'm using. Their isolation is pretty good. I regularly record guitar amps (5 to 100 watts) with the K271 in a one room studio.
Originally posted by LSchefman There is a company that mods the kind of protective headphones people who work around jet aircraft wear, to reproduce audio. I once saw it on the web, but I don't remember where.