Duelund DCA16GA

I thought the dielectric was responsible for the sound of this wire?  The tin coating is to prevent oxidation.

No, it does not melt off and cannot be removed

I'm not proposing to remove all of the tin coating, just the very end were it gets soldered.  It should be very easy to get off with Scotch-Brite, right?  It should just be a very thin layer.  Copper is a much better conductor than tin.  If you remove the tin, the signal will travel from the copper in the wire to solder to the RCA connector instead of from the copper of the conductor, through the tin, through solder, and finally to the RCA connector.  It's one less layer of a (poor) conductor that the signal has to pass through.
Have you compared cables with and without the tin removed?

The tin plating is part of the sound and Duelund did not use it to ward off corrosion which is no longer an issue with today’s better wire coating.....including oil impregnated cotton. So it is there for the tone. It is a fine stranded copper wire and I would not try to remove the tin, I don’t you can anyway. It is part of the wire.

So yes the wire and cables sound better with the tin. You can buy stranded Duelund copper wire in cotton without the tin. It does not sound as beautiful.

After reading all the reviews, I decided to buy a bunch and redo my whole system in these, after 15 hours ..

I just tried the 16 in my system along with 20 to the woofer and had the same issue scm, the bass and low end on these wires are nice. 

The mids and voices are gone, the sense of realism is gone. 

The highs are still there but not as good. 

Then I added the 16 as IC to my system, and it sounded even worse. 

These are compared to generic cables from partsexpress 

They also require the volume to be turned up. 

I don't know if i can have them for another 80 hours, and have to listen to them for a few months to see if they work out, when they are so far from what I was looking for. 

You need to give it a good 200 hrs to really make a judgment, the last to come back is the mids and highs. 

I think the 20 on woofers is way to thin, I use the 3.0 silver foil on my woofer and 2.0 silver foil to the tweeter.

@ketchup    

If you remove the tin, the signal will travel from the copper in the wire to solder to the RCA connector instead of from the copper of the conductor, through the tin, through solder, and finally to the RCA connector. 

  Solder is mostly tin.  Just solder your joints and don't worry about it.