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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
oldschool1948's avatar
oldschool1948 OP
501 posts
 
@lalitk Thanks for the input.
gs5556
1,234 posts
 
Just one caution: If that earth connection on the speaker ties the common (negative terminal) to ground then it would damage an amplifier with active speaker terminal outputs if you ground the speaker.
audioguy85's avatar
audioguy85
2,018 posts
 
I have the tannot legacy eatons and I use 12 gauge stranded green wire (could use solid copper, but a bit less flexibility), terminated to one gold plated 8 gauge #6 spade to the amp. On speaker end, stripped and silver solder tinned wire ends to the 5th ground speaker terminal. The ground wires from both left and right channels are terminated together into the one aforementioned spade connector (two 12 gauge wires equates to 9 gauge) and attach to one of the rear chassis screws of my Sugden A21se. Not certain if I can detect a difference....anyhow, I like the fact that the 5th terminal is provided and it probably can’t hurt...
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.
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