Buy High Pass Filter or KAB RF1?

Thank you very much. It either buy the KAB or buy a preamp with rumble filter I guess. I was thinking of possibly the pro-ject tube box S2 if I don’t go the KAB route. 

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.