DIY (do-it-yourself) speakers can be connected to a variety of devices using a variety of different connection types. Some common connection types for DIY speakers include:

1. Bluetooth: This is a wireless connection that can be used to connect DIY speakers to a variety of devices, including smartphones, tablets, and laptops.
2. 3.5mm audio jack: This is a small, circular connector that is often used to connect headphones and speakers to devices such as smartphones, tablets, and laptops.
3. RCA: This is a connector that is often used to connect audio devices, such as speakers and amplifiers, to each other.
4. Banana plugs: These are connectors that are often used to connect speakers to amplifiers or other audio equipment.
5. Speaker wire: This is a type of wire that is used to connect speakers to an amplifier or other audio equipment.

It's important to note that the specific connection type required for a DIY speaker will depend on the specific components and devices being used.