Speaker cone movement on vinyl

[Geoff101]

Hello,

I've posted this over on pink fish as well but though it couldn't hurt to ask here as well:

I noticed something last night and wanted to ask if it was normal.

Whilst listening to a record, I happened to have the grilles off my speakers. I noticed that if I go anywhere near my turntable whilst it's playing and in particular touch the rack, I get a large movement on the speaker cone (as if it's getting DC on the coil). It didn't really look healthy and as I'd never be able to afford to repair them, I'm worried about damaging my speakers.
It never sounded as if the cones bottomed out which I believe mine are prone to but none the less was a bit worrying.

That part of my system is:
Michell Focus One with Hadcock arm and Shure M91ED cartridge
Nakamichi CA-5Eii Preamp using internal phono stage.
Audiolab 8000P
Dynaudio Audience 52SE

I can swap back to my AV32R and external Creek OBH8-SE to see if I get the same on that or is it just likely to be arm setup or something else?

[spendorman]

Hello,

I've posted this over on pink fish as well but though it couldn't hurt to ask here as well:

I noticed something last night and wanted to ask if it was normal.

Whilst listening to a record, I happened to have the grilles off my speakers. I noticed that if I go anywhere near my turntable whilst it's playing and in particular touch the rack, I get a large movement on the speaker cone (as if it's getting DC on the coil). It didn't really look healthy and as I'd never be able to afford to repair them, I'm worried about damaging my speakers.
It never sounded as if the cones bottomed out which I believe mine are prone to but none the less was a bit worrying.

That part of my system is:
Michell Focus One with Hadcock arm and Shure M91ED cartridge
Nakamichi CA-5Eii Preamp using internal phono stage.
Audiolab 8000P
Dynaudio Audience 52SE

I can swap back to my AV32R and external Creek OBH8-SE to see if I get the same on that or is it just likely to be arm setup or something else?

Just read this and thought that I was on Pinkfish!

[walpurgis]

Assuming the rack is on the floor, what you are getting is floor movement transmitted up to the turntable, it common enough, some turntables are more susceptible that others. You could try standing the rack or just the turntable on a stone slab and the extra mass may help reduce movement, but really the best thing is a wall mounted support for the turntable. I doubt you'll damage the speakers, but it's a situation best avoided.

[spendorman]

Even if the the large movement of the cones is not that likely to cause speaker damage, it is wasting amplifier power, probably not so important these days, and it may be causing inter-modulation distortion.

[Geoff101]

Thanks for the advice.

It's on a stands unique rack (without the TT isolation platform) on spikes (into cups) stood on a laminate floor. The laminate has a felt layer under it so does move about a bit.

Hopefully moving house soon so may invest in a wall shelf once moved.

[YNWaN]

I've seen your question on pfm and, to be honest, the advice you have been given is correct which is why I haven't contributed further. Ported speakers, as you have, are more prone to the effect you describe than sealed boxes, but there isn't much you can do about that.

[Geoff101]

Thanks again. Wasn't sure if most people were on both forums or not hence the double post.

[AlfaGTV]

If you have the option, apply some subsonic filtering?
Not familiar with your equipment, but if available, it will also lessen the issue substantially! :)
Regards Mike