To determine the appropriate wattage for your room, you'll need to consider the size of the room, the purpose of the speaker, and the acoustics of the space.
If you are using the speaker for background music in a small room, you may not need a high wattage speaker. On the other hand, if you are using the speaker to host a party or event in a large room, you will want a speaker with a higher wattage to ensure that the sound can reach all corners of the space.
It's generally a good idea to choose a speaker with a wattage that is appropriate for the size of the room, as a speaker that is too powerful may result in sound that is too loud or distorted, while a speaker that is not powerful enough may not be able to produce sufficient volume to fill the room.
One rule of thumb is to select a speaker with a wattage that is equal to or greater than the total square footage of the room. So, for example, if you have a 500 sq ft room, you would want a speaker with a wattage of at least 500 watts.
It's also a good idea to consider the acoustics of the space. If the room has a lot of hard surfaces (such as concrete walls or a tile floor), the sound may bounce around and be amplified, so you may not need as much wattage. If the room has a lot of soft surfaces (such as carpets and curtains), the sound may be absorbed and you may need a more powerful speaker to compensate.