have you actually tried powering the fan with 5 or 6 volts to see if it will start up? you wont know unless you try.
as far as the fan controller goes, you'll have to see what the max amperage per channel is. for mine, its 1.5 amps. i would think that most quality rheobuses would be able to handle those fans without any issues. Power (watts) = Voltage * Current. so with 12 volts going to your 1.2amp fan, you'll need a controller that can handle at least 14.4 watts per channel (and most can). when in doubt, email the manufacturer.
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