woofer flutter normal

[6mantoys]

my woofers flutter when playing tt is that normal

 

[Sir.Byrd]

yes, rumble, try to isolate your turntable from something that is connected to your speakers. If you secure your TT to a shelf on the wall, this is ideal.
You can also use a "low filter" or "subsonic" if your amp/receiver has that feature.

 

[6mantoys]

the subsonic filter does help,thanks been twenty yrs since i used a tt

 

[catman]

G'day all, a good 'sub- sonic' filter works wonders! One of my systems had an alarming level of unwanted cone movement (on a ported loudspeaker system), but I solved the problem by building and installing this DIY filter. http://sound.westhost.com/project99.htm Regards, Felix aka catman.

 

[gusten]

Though a subsonic filter reduces the amplitudes of the woofer, that is not really the cure. These amplitudes indicate that something should be fixed on/with the TT. It can be that the TT should be better isolated from feedback, it can also be so that the resonance frequency of tonearm/cantilever is to low.
In any case the influence on the sound is not solved without addressing what is causing the problem. Sonically these amplitudes are adding quite a bit of distortion that should´t be there.
/gusten

 

[catman]

Thanks Gusten, I tend to agree with you, although in the case I mentioned the problem was essentially caused by very warped records (I have quite a few of those thanks to storage in a hot environment in past years), and the low frequency woofer cone movement was as a direct result of the record warp and not any cartridge/ tonearm incompatibilty.

In any case the use of a good sub sonic filter has other advantages such as 'cleaner' playback due to reduced intermodulation effects and greater available amplifier power as the amp is no longer required to reproduce the sub bass signal rubbish. Regards, Felix aka catman.

 

[gusten]

felix
I totally agree, in some cases it´s very useful to have a good "rumble" filter.
I was merely pointing in a direction that most of these problems with woofer pumping should be investigated and solved, and with a better sound in the end.
/gusten

 

[6mantoys]

ok so what should i be trying to do to get rid of it

 

[gusten]

Do a search here at AK, there are a tremendously amount of info in these matters.
/gusten

 

[musichal]

What is your turntable?

 

[catman]

Greetings all, one of the really nice things about my beloved M97xE's apart from their sonic virtues, is the dynamic stabiliser!

In the case of real cartridge/ tonearm incompatibilities, the dynamic stabiliser damps undesirable resonances beautifully! Regards, Felix aka catman.

 

[6mantoys]

its a jvc ql-f4

 

[fiddlefye]

I've had rumble filters (under different names) on many integrateds and preamps over the years and never have felt a need to use one. My amplification has no problem getting down to the problem zone etc. so I guess I've just been lucky with the combinations I've run. I can see where it could be a potentially dangerous issue for your speakers, though.

 

[audiofred]

Rumble filters tend to cut too much of the low-end from the audio. Maybe catman's sub filters won't be so un-kind to the audio you want to listen to.
I have had good results with my Yamaha YPD8. A good solid TT that can be used at high volume in the same room as the speakers.

Fred