Buy High Pass Filter or KAB RF1?

I'm pretty new to the forum and have read a thread about rumble filters and how some folks think they degrade the sound.  

I have a second system that I use a MoFi Studio phono pre that has a rumble filter which I use and it works quite nicely.  I haven't noticed any sonic degradation but maybe my system or ears are not quite as resolving as others.  

Why do you need it ? 

I need it because the cones on my two speakers as well as the woofer on my sub are modulating very badly when playing phono. 

@craigert...……………………………...

Everyone here will tell you to relocate the turntable, put it on a maple, slate or granite platform, or tennis balls, mount  turntable to a shelf on wall, change cartridge, etc.  I tried all that, blowing money on 3 different platforms, new cartridge and I STILL had to buy the KAB Rumble Filter.  Save yourself the grief and expense that I did and get the filter.  I can't hear  a difference with and without it and I am feeding it expensive cables to boot.

Thanks Stereo5. Yes, it’s quite frustrating the number of people who say to relocate the table when they know a TT has about two feet worth of phono cable length to work with. There are only so many relocation options. 
On other threads I have asked questions like...what does everybody like better A or B....and everybody seems to want to give C as the answer. Lol 

I have already determined I am getting some sort of rumble filter to try no matter what anybody says, because the problem can come at an instant when I am showing my system like last time I had guests and I want to be prepared. 
I will probably get the KAB and then buy an Atoll phono preamp because they are my favorite sounding audio company. 
I just hope having the KAB and the Atoll feeding into a line input in my Marantz isn’t going to be too many connections.

Do you think it will?