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KAB RF1 Sobsonic Ruble Filter - Worked but feels like I lost some sound quality

My system: 

Technics 1200G with Orofon black LVM

Luxman 595 MM/MC integrated 

REL 830

Sopra N1s

 

I bought the KAB RF1 Rumble filter for MM. I did it because I have woofer excursion really bad in my set up with my Turntable... and not to derail this post into things I tried let’s just leave it as I tried everyhing.  

The Subsonic filter on my Luxman helps alot but it does not get rid of all the woofer excursion... there is still some... especially in electronic music. 

So I tried the KAB RF1. It did not get rid of the woofer excursion by itself. But when used with the Luxman subsonic filter, it did successfully get rid of all the woofer excursion with the turntable playing. I was quite suprised. But here is the downside.... I felt that I lost some of the holographic sound stage in my sound. Enough to bother me. Anyone else have exeperinece with KAB RF1 filter? 

https://www.thecableco.com/rf1-subsonic-rumble-filter.html?gad_source=1&gad_campaignid=10024381600&gbraid=0AAAAADmuR9dGQ54YEDtMg9w1EumnwYIkN&gclid=CjwKCAjw6f3RBhApEiwAMaCqWVuhNEupwaT8BJNb0c6m9vbdX2w2MIY2z9wGqCvUrQA9ZYWzME69LhoC2p0QAvD_BwE

EDIT: Sorry for the missspelling in the title. I can’t edit it.  

dman777
anton3rdman
6 posts
 

I experienced this with stereo REL 9i's. Help from

REL, Grado, Paul McGowan and Rogue Audio was to no avail despite their kind guidance in trying to find the cause. Kevin at KAB sold me this filter and it stopped my RELs.from hitting the stops. I lost the below 20hz pressure which does effect the sound somewhat but it was that or forget vinyl.

BTW, same songs on CD, no problems. Speculation was subsonic sound caught during cutting the shellac master, even possibly the cutting machinery. No way to test this hypothesis, however. 

 

yogiboy's avatar
yogiboy
6,203 posts
 

A tonearm and cartridge mismatch will cause the problem that you are having with woofer pumping. If you don’t address that the woofers will pump till the cows come home!

yogiboy's avatar
yogiboy
6,203 posts
 

Here ya go!

https://abmusics.com/tonearm-resonance-causes-effects-and-solutions/

billstevenson
1,219 posts
 

@yogiboy Is correct, which is why it is important to understand the system before we can help.  We are all whistling in the wind so far.

lewm
14,707 posts
 

Also, some cabinet designs permit woofer motion that can be seen. That phenomenon is not “woofer pumping”. The question is are you seeing a regular and very pronounced movement or is it subtle and visible only with loud low frequency musical passages? The latter can be normal.

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