The Harmon Kardon are usually under rated, so check your manual otherwise.
If you hook up 8 Ohm speakers in parallel, then you'd get a total resistance of 4 Ohm. If you connect 4 Ohm in series, then you'll have 8 Ohm. So ideally, you'd use 2 x 4 Ohm speakers in series for each channel (he he he).
If you're considering using the sub channel, then you'd be all set, as the sub channell is mono, not stereo, so you could go ahead with plan B, and hook up the subs in series to the sub channel.
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