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I will go ahead and put the original question back on track as just about every response seems to be about "Interconnects" which with the gold coated wire at 20 gauge the poster asked about in the link would work fine for interconnects, but he specifically asked about a 40ft roll of / 20 gauge wire used in a speaker cable with bananas. No not worth it. Basically with a 40 ft spool you could make a total - 10ft pair - with a pair of positives, and pair of negatives all 10 ft each.And this would be hardly worth working with for DIY in speaker cables, and I doubt you will even find teflon tubing along with it to do this at the price you quoted yourself "$150".20 gauge would just be too small for any serious system. It would work if your 1 ft away on a desktop speaker system, but I would not go much smaller than a good 14 gauge speaker cable in any mid to high end stereo with equipment capable of delivering any real current. Also, no you don't need gold coating. Honestly it's for corrosion more than anything. Tonally it might vary the sound to a degree vs. Rhodium, Platinum, Nickel coatings etc... or just bare copper, but won't necessarily make it better or worse.
How much power is your amp? I mean you can use 16 awg, but I would not use 20 awg as you originally posted. 16 awg is "Enough", but honestly I would just go up to 14 awg at least because there won't be some huge cost difference in this case, and you can find very good quality 14 awg generally for a basic speaker cable. If you want better you can find special geometry cables which Neotech happens to make in bulk for your DIY design if you choose. Since you have Neotech interconnects I can tell you that the speaker wire is excellent as well, but not exactly cheap... I currently use it myself, and made in Japan so quality is excellent. http://www.soniccraft.com/index.php/wire-speaker-c-296_179Also, another very cheap, but higher end than almost any bulk available is Supra cables. It is "tinned" to keep corrosion out. They sound great for over a buck each foot, and by far and away beat your basic "Zip cord" of the same style that is available from Monster cable or Radio shack in the basic clear dielectric. It's a little easier to terminate vs. the Neotech above, but the Neotech is a little more organic, slightly refined, and high end sounding. The Supra is just very good for what it does, and in some systems just as good made in Sweden, but easy to get here in the states. You can get it in 15 awg, or 13 awg...it's better than most of the generic stuff you will find on ebay. https://www.madisoundspeakerstore.com/speaker-wire/supra-classic-1.6/bulk-cable-per-foot-15-awg/https://www.madisoundspeakerstore.com/speaker-wire/supra-classic-2.5-speaker-wire-per-foot-13-awg/
The same seller also has 16awg wire. http://www.ebay.com/itm/25ft-Clairvoyant-Cables-24k-Gold-plated-99-9999-pure-OCC-copper-wire-16awg-/121754119017?hash=item1c591c6b69:g:B6wAAOSwuTxV7oa6
The problem here is from a material standpoint you have a lot of work to get them to "Speaker cables" and you don't know what the capacitance, resistance etc... will be in the end so it may not be the best choice for sound quality in speaker cables honestly. Unless you are hell bent on "Solid" core because you don't want stranded core I can tell you then Audioquest TYPE 4 cables are also excellent netting just in over 15 awg, and not very expensive, but designed and proven to sound good as speaker cable. http://www.audioadvisor.com/prodinfo.asp?number=AQT4NFThey make it in Bulk for DIY as well.http://www.audioreview.com/cat/cables/speaker-cables/audioquest/type-4/prd_116384_1584crx.aspx
Here you go if you really want to save, and get the best results with the proper bananas already terminated. And it's a step up in copper quality as well.http://www.ebay.com/itm/Audioquest-CV-4-8-Pair-Full-Range-Speaker-Cables-/182133880720?hash=item2a68067790:g:T4gAAOSwdrRXGBH9
They look good. I have had Tara labs before. But it was with a system not worthy of reviewing at the time so I can say they have been around a long time, and make some very respectable cables. At these prices not bad at all. But I might buy those Audioquest for 70 bucks if you don't they are pretty nice for a good solid primary or backup speaker cable the price is hard to pass up