Duelund speaker cable gauge for my system?

Get Auditorium23 cables, they are specifically designed for high efficiency speakers.

What is your system? Sounds like this is a component problem more than a wire problem. 
 

There is a place to show your system under your profile. It is really helpful for us to be able to help you, to see the whole picture.

I've been using Duelund 12 gauge in both of my systems for years.   They replaced considerably more expensive cables.   I've found they need about 200-300 hours to settle in, so the initial break in process is lengthy and frustrating, but ultimately worth it in the end.

If you google it, there's a good write up on Duelund on a blog.

I ran dual 16g and I found them bit on the warm side; I read that the larger gauge you go the warmer it gets.  Never tried the 12.  For speaker I ran them unterminated.

Legendarium 2A3 SET to Klipsch RP5000.

I only ran the singles as ICs; I don't think there was a difference.

@ghdprentice +1

I agree.  Solving that problem with wire changes sounds like chasing your tail.

BTW, I have a wide variety of speaker, interconnect, and power cables made from both Duelund and old stock Western Electric tinned copper wire.  The house sound is full-bodied and somewhat midrange-centric.  Another similar wire you could consider is made by Jupiter Condenser Co. in 16 and 12 gauge twisted pairs.  The machine twist is nice.

Yes you have a very complicated system knowing what it is would help very much and obviously high sensitivity horns are very sensitive to amplification.

The Duelund is warm sounding but not that great in detail ,especially low level.

try the Kimber  8TC , or12TC very good quality Litz wire,  a solid value.

Not knowing what Cha got, equipment and room, we can’t know how best to help.

All the best.

Well, a friend of mine sent me a short length of Duelund DCA12GA 600Vdc. It is the wire that is recommended for power cables, but some people like it a lot as speaker cable. I know my friend did! On horns. The difference is the dielectric, which is oiled cotton on the regular DCA cable, and a "Polycast" resin on the 600Vdc cable.

So, I connected the left channel with the Duelund, leaving the old cable on the right channel (there was not enough length to do both) and I must say that I’m impressed.

The Duelund DCA12GA used as speaker cable sounds a bit dark, very meaty, "intimate" but is articulate and quite detailed - I don’t feel there’s anything missing from my music. It seems the synergy with my horn speakers (which are not exactly "soft" sounding) and electronics (Gustard X26Pro DAC, Pass b1 preamp, Sublime Acoustics K231 active crossover, class D chip amps) is just right, toning it down a bit without sounding overly soft or mellow - electronica and rock sound great, upper bass is punchy and meaty, guitars have bite but everything is just darker in color)

On a laidback system, it would probably be better to use the regular Duelund cable, but on a bright / upfront system, the 600V cable works really well.

So, I’ve ordered some length of DCA12Ga 600Vdc to be able to cable the whole system, and I will come back to give my impressions with both channels. I expect the burn in period to be long and difficult but I’ll hang in there!

I have found multiple wires specifically solid wires sound better using 8 or 9 strands to make up a 10awg for example rather than one large wire. 
YMMV

@tecknik 

Multiple solid core wires for speaker cables is what Harmonic Technology has been doing for years.  They used individually insulated, small gauge, OCC copper wires and the cables sound great IMO.

@rolox You will know after 200-250 hours of break in.

@pdreher well yes I suppose there will be some break in happening, altho quite surprisingly there doesn't seem to be this awkward rollercoaster burn in period ( or maybe it hasn't started yet!) where you wonder why in hell did you purchase the cables.

I think I'm hearing small changes happening, but it never departs from sounding good - so far at least. We will see!

The rollercoasting I have heard generally happens between 100 and 200 hours.