filters on speaker cables


I have a slightly long winded question on adding filters to my speaker cables to bleed of low frequencies. So is it possible to add a filter to each speaker cable to lessen to load on the amp when reproducing low frequencies? And if so what value,where do I get them, and how do you install them? I would like to add a stereo pair of quality subs to my system. I am using a Modwright KWI 200 integrated amp with Tyler Acoustics Woodmere II Speakers. I love the sound of the integrated but no way to add a crossover to the system as is. There are many here that say adding subs and lessening the load on the amp and main speakers has great results, so much so, that I really want to try it. So I am looking for another option without buying separates. Any advice is greatly 
mizike
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Hello Bob, I have a 5.1 set up with a single Paradigm Sig 12 sub and use the HT bypass when watching movies. I will likely move on from this idea and dream up something else to obsess over, thanks for the good advice. I had read so many threads on here describing the benefits of two subs with crossover to lessen the load on main speakers and amp for two channel that I was hoping that I could find a way to try it without buying separates. Looks like that is what I'll have to do to implement what I am wanting to try, thanks again, Allen.
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