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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Was out of town for a couple of days with the grandkids, but I have spent some time,money and effort on treating my room, and YES it was a major step forward in sound, Thanks, Allen.
I’m in a similar situation to you... I have floor standers (that don’t even go as deep as yours) and two JL 12" subs, in a system that does double duty for HT and 2-Channel. I found an amp I really love, but it’s an integrated, and I had been banging my head over how to integrate the subs.

While I was also expecting the mains to get better, with the subs taking over bass, I haven’t noticed any difference. So I think your intuition to move on and obsess over a different aspect of your system is wise :) Where two 12" subs will make a difference, is providing deep prodigious tight bass, which is amazing if you watch movies or listen to certain types of music. So, if that’s what you’re craving, the extra trouble to properly integrate subs can be worth it--but if all you’re wanting is to improve the performance of your main speakers, I think you’ll be disappointed.