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Turntable Causes Speaker Cones To Excessively Move Rapidly

I have a Technics 1200G turntable, Luxman 595, and I use MM carts. For some reason, when I play my turntable I see my sub woofer cone (REL sub) and my Focal Sopra N1 cones move violently. There is a subsonic filter on it where helps cut down on it. But I am wondering... does anyone else have this issue?

If I didn’t have the subsonic filter would the violent moving of my cones damage my speakers? I ran it for about 2 hours total of turntable music before I noticed. 

Not a issue with my streamer... they stay almost perfectly still. Just with turntable. 

dman777
otimmons
11 posts
 

The Ortofon has a compliance of 22 compared with 22.5 for the Shure. The resonant frequency in a 22g tonearm is 6 Hz. Anything less than 8 can give the unwanted resonance. you may have a mismatch.

 

look for a cartridge with a dynamic compliance less than 16, preferably less than 13 x 10^-6 cm/dyne

stereo5's avatar
stereo5
6,711 posts
 

buy a KAB Rumble filter and call it a day.  It took away the oscillating with my former VPI Prime.  I no longer have the problem with my Technics SL1200G and no longer use the filter.

billstevenson
1,165 posts
 

lewm had asked you in another thread what headshell you are using.  I don't remember your answer.  @otimmons is giving you that same information in a different format as have others.  It does sound like you have a resonance problem.  This is caused by the mass of the arm and headshell being too high for the compliance of your cartridge.  If the resonance of the cartridge/arm assembly falls outside the range of 8-12 Hz there is a problem.  In your case it is likely the resonance is under 8 Hz and that is why your speakers are pumping.  This problem is more common than most people realize.  Step 1.  Use the OEM headshell, which is < 8 grams including azimuth adjustment and is the lightest weight one available.  That might be enough.  If not, Step 2.  Chose a cartridge with less compliance.  Staying with a MM, I have had excellent results with the new Audio Technica VMN60xSL for example on my SL1200GAE.  It works better than my 2M Black LVB on that turntable in part because of the compliance difference.  With other arms, the more expensive Ortofon more than holds up in the comparison.  Arm compatibility is just as critical as picking the best cartridge. 

dman777 OP
188 posts
 

@stereo5 can you please tell me what cartridge and what had shell you use?

dman777 OP
188 posts
 

@audphile1 I tried an experiment. I only used one speaker furtherst from the turntable. I had my sub off. I still got the woofer excursion on that single speaker that was on....so I don't think it's coming from the speakers or sound waves.

 

Could the lid on my turntable be causing it? I tried it with lid closed also and still had the problem.

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