François Yves Le Gal wrote;

On Thu, 16 Mar 2006 15:49:15 +0200, Fella wrote:

In the manual the tannoy people say something *very* similar to what our
pal shp is saying.

Nope. Tannoy as well as other manufacturers only ground the baskets. This
can be safe with most amps, even floating ones, as there is no direct
connection between grounds.

Sonics benefits, if any, are another story. This approach creates nice
antennas picking up RFI...

The initial post
roups.com
mentioned:

Solder each piece of wire to the positive terminals of each driver
connected to the crossover board inside the speaker. Do the same for
the other speaker. Now combine the free ends of all 4 (or 6) wires, and
connect this to the terminal grounding screw at the back of your amp.

Positive to ground = short circuit for non floating amps, where the "+"is
live and the "-" is referenced to ground; a short plus a common ground for
floating amps. A very stupid thing to do in both cases...

I tire of your ignorance. You've never tried this or any of my other
tweaks, so as with everyone else who hasn't tried the tweaks, you don't
know what you're talking about. You're trying to obfuscate the matter
with technical arguments that are not valid in my case, any more than
they invalidate the manufacturers of grounded loudspeakers. Your
arguments only prove your ignorance. So as I have extended to others, I
invite you to come to my place and I will demonstrate how tragically
wrong you are. You will be able to see the wires connected from the +
terminals of the drivers on the x-over of both speakers to the
grounding screw terminal on my amp; as it and numerous other
amp/loudspeaker combinations I've owned have been so wired for 7 years.
You will hear the amp driving the speakers at realistic volumes.

Among the things I will prove are that: there is no hum, there are no
sparks, there are no detrimental effects from RFI or EMI, the speakers
sound worse when the ground wires are displaced from the amp, the amp
does not blow up, and that you're a dogmatic ignorant twit, who
arrogantly speaks with confidence over things that are false. If I am
not able to demonstrate any of the above, you will have your travel
fare fully reimbursed. If I am, then you agree to post an apology on
RAO to me excusing your mindless ignorance, and admit that I'm right.
(The only condition I will not guarantee, is the part about hearing the
improvement. Like everything in audio, that is entirely a subjective
matter, and being a religious pseudo-objectivist, my belief is that
your listening skills are non-existent, or thereabout.).

Since nothing but demonstration can convince the truly ignorant, this
will put the issue to rest as to whether attaching earth wires from the
loudspeakers to the amp's grounding terminal will blow up an amplifier.
For the last time, either put up or SHUT UP.