If you’re like me, you think the point of headphones is to be able to listen to music on the go. Clearly, though, that isn’t the case for some audiophiles. The world’s most expensive headphones are hardly portable.

Sennheiser, a leading manufacturer of studio and stage microphones, created a limited number of what have been called the best headphones in the world. That’s right, only 300 of these headphones exist—possibly because they’re handmade. The set includes a high-end vacuum tube amplifier with an all-valve signal path and equally high-end electrostatic headphones with gold connectors.

The most expensive headphones in the world originally retailed for around $15,000 and can still be found for less than $30,000. Of course, if you plan on hooking them up to your iPod, you’ll need to leave the amp at home.

Another pair of expensive headphones, the ULTRASONE Edition 9 Limited Edition S-Logic Natural Surround Sound Headphones, come with some cool features. The S-Logic natural surround sound takes the sound out of the headphones and into the room around you for a three-dimensional sound similar to a live concert. Less stress is put on your eardrums because pressure is decreases by up to 40% (3-4dB), allegedly reducing the risk of hearing damage.

Ultrasone’s expensive headphones also utilize ULE technology with an MU metal shield that reduces radiation by up to 98%. . The ULTRASONE Edition 9 Limited Edition S-Logic Natural Surround Sound Headphones are certainly a luxury to be had by the most discriminating audiophile. At a retail price of $1499.00, they’d better sound good.