2-core HD800 female socket, small Utopia earphone female socket, HD800 female socket, HD820 female head

It sounds like you’re referring to various types of headphone connectors. Here is a breakdown of each type mentioned:

1. 2-core HD800 female socket: This refers to a connector designed to fit the female socket on Sennheiser HD800 headphones. The 2-core design likely indicates that it has two separate connection points within the socket.
2. Small Utopia earphone female socket: This would be a connector that fits the female socket on Focal Utopia earphones. The “small” designation may refer to the size of the socket or the type of connection it uses.
3. HD800 female socket: This is similar to the first point, indicating a connector that fits the female socket on Sennheiser HD800 headphones specifically.
4. HD820 female head: The HD820 is a model of closed-back headphones from Sennheiser. The “female head” may refer to the socket or connector on this particular model.

These connectors are essential for ensuring compatibility between your headphones and audio equipment. It’s crucial to use the correct cables or adapters that match the specific connectors on your headphones to ensure proper audio transmission and optimal sound quality.