Cheap tweaks...What would YOU reccomend?

That is correct, current is neither positive nor negative, but voltage is + or -. Current can go in different directions in the same conductor depending on the difference in potential (voltage) at the ends of the conductor. That is why direct current is called that - the voltage difference from one end of the conductor stays essentially the same and the current flows in the same direction all the time. In Alternating current, the voltage difference changes and alternates between + and - from one end of the conductor to the other, so the current alternates in its direction. Current has no polarity.

And the current going to the speaker is ac or dc?

AC, of course. Speakers don't work on DC. Its the alternating of the current in the coils (dynamic speakers) that makes the speaker move back and forth (the principle is different on electostatic spekers, but still depends on the alternating of the voltage). If you attach a battery (9v), which is a source of DC, to the speaker it will move to one position, front or back, depending on its polarity.

Now do you understand why it is nonsense to talk of negative and positive conductors and using different types of materials for these supposedly different conductors?

Salut,

for people that wear eyeglasses is to take them off! a most noticable improvemnent for free.
next-the hifitommy toysRus turntable isolation tweek. four toysRus arm floaties (for kids arms while in the swimming pool) under the tt or under a mdf platform under the tt, adjusted for levelness. the cartridge will no longer hear the cabinet it sets on. the real benefit is that it is so pretty!
this is so much better than a single ring because it is rock stable.

Turn off refrigerator! The improvement will melt you away!
(And your ice cream...)