A little more impedance please?

Using dumpster parts I made a remarkably system for our outdoor barbecues. I'm moving but my 2.1 amp is coming with me. Just as an exercise I want to rewire the speakers to be driven from a stereo amp.
If I convert the sub to passive stereo it will be 6 ohms. The satellites are also 6 ohms. This gives me an impedance of 3 ohms per channel. If I use a cap as a high-pass filter to limit the mains to 100hz+ will I get to 4 ohms nominal.
 

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