speakers
if they are a dual voice coil they will be 2 ohm or 8 ohm with two 4 ohm voice coils ( 2 positive,and 2 negative terminals on each speaker) or 1 ohm and 4 ohm with two 2 ohm voice coils, etc or it could be a single voice coil (1 positive, and 1 negative terminal) which could be 8, 4, 2 ohm etc. usually its printed on the speaker somewhere. hope this help a little