Most of the people who buy headphones do so with the intention of using them (the headphones) with electronic devices such as radios, phones, iPods, computers and so on. Now, it emerges that there are two types of electronic devices on which headphones are used.
The first type of electronic devices on which headphones are used are those which come with specialized ports for the connection of the headphones. The best devices in this class actually have standardized ports: which make it possible for any type of headphones to be connected. Thus, with these devices, you don’t have to go about researching to find out what are the best headphones for their ports: because the ports are standardized, to connect with all (common) types of headphones.
The second type of electronic devices on which headphones are used are those in which there are no specialized ports for the connection of the headphones. In these devices, some tweaking with the circuitry has to be done, before the headphones can be connected. Thus, for instance, if you have just bought the best noise-isolating in-ear headphones and you want to connect them to these sorts of devices, you first have to create the connection, by tweaking with the circuitry. Thankfully, the tweaking that is necessary is basic: not the sort of technical undertaking that would require a rocket science degree from, say, the Massachusetts Institute of Technology.