It depends on the model speaker. The speaker has an RMS amperage rating used for choosing the amp size needed. You would want to choose the upper number if there is a range. For example 50-200 rms watts, choose an amp with 200 watts. It is worse for the speaker to have too little than too many amps. Crutchfield even recommends 75%-150% of the RMS rating. You will also need to know the OHMs of the speaker when choosing the amp. There are sub woofers rating at 2 and other rated for 4 OHMS and have different amp requirements.
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