Either one of these options would work very well. If the size is not an issue then the M60s would probably make the most sense. I gather you already have the EP175? Using the EP125 in conjunction with the EP175 is a very good match; so no problem going the M22 and EP125 combination if this is what fits your space the best. The x-over on your Harman Kardon will limit the sub to 100Hz making any of the x-over settings on the sub above this to be 100Hz. If 100Hz is the desired x-over setting for your system in your room, then I would just turn the x-over on the sub up to the maximum frequency setting. If you would like to set the sub below 100Hz then you can use the frequency adjust on the sub woofer to accomplish this.
Ian Colquhoun
President & Chief Engineer
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Ian Colquhoun
President & Chief Engineer