Also, I'll point out that unless your dual wall heatshrink is VERY HARD when it's shrunk, that connection won't last long. Crimp connectors usually surround the entire circumference of the wire...you'll be trying to hold the wires together with heatshrink adhesive.
Crimp connectors are cheap and easy - ask any electrician, they'll tell you solder joints are always superior. I wouldn't be suprised if a lot of house fires caused by bad electricial were because of poor connections. When you crimp or wire cap (ESPECIALLY wire cap, crimp isn't that bad if done right) and the connection loosens over time due to vibrations, you end up with two conductors touching at a really small point...and when you're pushing 120 or 240 VAC and 20 amps through it, smaller conact means more resistance...which means heat...which means fire.
Anyway maybe that's not the cause of a lot of house fires, crimps are pretty good if you do them right, but the point is that solder is better. If you HONESTLY think 60/40 electrical solder will somehow effect sound quality, go buy some of that 40 dollar/pound Cardas solder. At least you'll get a good joint and I hear it smells good.
