A decent quality 8 ohm speaker with a baffle will give you good sound. The baffle is all important for making good sound, even and old spray can cap will do it. For most steamers, you can fit a 2" speaker in, the bigger the better. If you can fit two 4 ohm or two 16 ohm speakers in, so much the better. Obviously, they have to be connected in series for 4 ohm speakers and parallel for 16 ohm speakers. Again, the baffle is all important here.
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