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Grounding Speakers

My Tannoy DC8Ti speakers have a ground connector.  Can someone give me a good idea as to why I should use it?  Full disclosure - I had them grounded to my pre amp before.  I just received, assembled, and reinstalled my gear on a new Butcher Block four shelf rack.  My other rack has 3 shelf, so I’m reconfiguring the layout.

My turntable is grounded to my phone pre Amp.  My power amp also has a ground connector.  Should I ground the speakers to the pre amp, power amp, or to a dedicated earth ground?  And is there any reason to use the power amp ground?
128x128oldschool1948
pjr801's avatar
pjr801
192 posts
 
I always like solid copper over stranded
cd318
2,636 posts
 
It’s nothing more than marketing.

Every design is trying to offer something unique and whilst I know some Tannoys use autotransformers in their crossover, I’m pretty sure it’s nothing to do with that.
audioguy85's avatar
audioguy85
2,018 posts
 
Yes supposedly over time, stranded can develop the so called skin effect distortion etc, at least that is what I've read. Stranded major advantage is flexibility. Solid is a bit more difficult to work with, but is better for a more wide open space, as stranded is better for tighter quarters due to its flexibility. However, it being only the ground wire and not a signal carrying wire, it probably will not have any audible influence whether it be solid or stranded wire. 
geoffkait's avatar
geoffkait
23,365 posts
 
Skin effect distortion? I’m not sure that’s true since the signal is not frequency varying. Or is it? Hmmmmmmm...🤔
mijostyn's avatar
mijostyn
8,570 posts
 
You can get 14 gauge twisted pair power cord with a shield  (third conductor) This is what Tannoy had in mind. If your cable is not shielded using the ground connector is useless. 
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