lewm

Responses from lewm

Why do my bass drivers shake violently listening to vinyl
As others already pointed out, the physically visible woofer pumping is typically seen when the woofer is mounted in a ported or vented cabinet that does not backload the woofer at extreme low frequencies. You’d never see it with acoustic suspensi... 
Why do my bass drivers shake violently listening to vinyl
Well if the OP's tt is not broken, and if moving the tt in his listening room or improving tt isolation do not have any effect, up or down, and if his LPs are not warped, then he does need a subsonic filter, preferably a good one. 
Why do my bass drivers shake violently listening to vinyl
I think dynamic and crusty have very good ideas about what might be going on. I was an early fan of transmission line woofers. Specifically I bought Irving M Fried (IMF) speakers in the early 1970s, because I thought they had unusually natural low... 
Triplanar Users VTA
3 for 3: it’s the cartridge, baby. 
Why do my bass drivers shake violently listening to vinyl
That’s why there’s been some mention of the KAB rumble filter which is a well made add-on. 
Why do my bass drivers shake violently listening to vinyl
Chak, If the 1200GR is without construction or operational flaws, I quite agree with you.  If it has a construction defect, like an off-balance platter or bad bearings or something rubbing on something, then it is better to identify that problem t... 
Why do my bass drivers shake violently listening to vinyl
That's very interesting.  You mentioned you are using a 1200GR turntable.  Do you own or can you borrow a different TT, just to see if the problem is the same with a different source TT?  I am wondering whether there is some sort of defect in your... 
Why do my bass drivers shake violently listening to vinyl
I generally prefer to go from the simple to the complex, in trying to solve any problem.  Simple is to either move your turntable in your listening room or suspend it, or both.  Complex is to add a subsonic filter.  If you add a subsonic filter, t... 
Manley Chinook Owners Tube Rolling
The Steelhead, and possibly the Chinook, uses a 30 µF metallized film capacitor for output coupling between the phono section and the line section. Then there is a second 30 µF metallized film capacitor between the line stage section and the outpu... 
Observation: Passion vs Obsession
Passion: Crazy things I do to make my system sound “better”.Obsession: Crazy Things other people do to make their systems “better”, in their opinion.  
Why do my bass drivers shake violently listening to vinyl
Before purchasing a rumble filter, I would first see whether changing the location of your turntable in relation to the speakers has any effect on the phenomenon you are observing. Also, the addition of some isolation to the turntable base might h... 
Phono Hum Question
You may think you painted a clear picture of your ground scheme, but I’m a bit confused. The only thing I do understand is that the source of AC makes a key difference. I would start with that observation and work backwards. 
I'm a Dummy, Tell Me About Turntable Mats
I think Ralph would opt for replacing the stock G series tonearm (are they all the same tonearm, regardless of cost?) with a Triplanar, if he had his druthers.what this discussion suggests is that most don’t like heavy floppy rubber mats, most pre... 
I'm a Dummy, Tell Me About Turntable Mats
I think this is like what the Supreme Court justice said about pornography. To paraphrase, he said he couldn’t define it but he knew it when he saw it. I can’t define tracking noise but I know it when I hear it. Except I’m not even sure of that. 
I'm a Dummy, Tell Me About Turntable Mats
Mijo, You wrote, "It is not really record noise. You are hearing the mechanical system of the record/stylus/cantilever/tonearm vibrating."  How does that contradict anything I wrote?  Moreover, your statement itself is a bit contradictory internal...