The difference you're describing is what everyone else has said all along. Balanced drive vs balanced transmission. The benefit to balanced transmission is improved noise reduction. The benefit to balanced drive is improved power, speed, etc. They're different things, and that they have the same name is where you're getting hung up. You can connect the balanced amp to the balanced preamp to the speakers any way you like, and as long as there are conductors for positive and negative, they're being driven balanced. You may get noise if you run the cables too far, or through a noisy environment. That's where balanced transmission provides a benefit. But shielding can have positive and negative side effects. Run fully shielded balanced connections to each earpiece in your headphones, and you'll stop wearing headphones due to neck strain.