Either. The difference being each sub will get wired to each channel of a 2-channel whereas the subs would usually be wired in parallel to a mono amp.
For a 2-channel amp, each channel should be around the same RMS watts as each sub at the impedance of each sub.
Mono amps generally require being able to handle half of the impedance of two subs wired in parallel if both subs are single voice coiled as well as the watts RMS of the amp being around the sum of both subs watts RMS. To wire in parallel http://i81.photobucket.com/albums/j230/sparky3489/PARALLEL.jpg
For instance, a mono amp that's 200 watts RMS @ 2 ohm would work best if both subs are at least 100 watts RMS @ 4 ohm.
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