Horn speakers are really bright?

Dig Sophie Zelmani. Garage sounds better! I don't get the "too bright" thing either. Unless it's searing your ears off, or just plain messed up frequency response,  you can't have enough detail.

Garage sounds good, very open and revealing. KLF in living room sound very bright to me. Voice not bad, but guitar and instruments sound thin with so much high-end energy.
BTW, I can hear up to 18kHz and I think the iPhone is positioned too close to speakers.

The years have taught me that generalizations about audio are often wrong. 

I agree with Russ, in that it’s often not accurate to generalize about the sound of anything because there are just too many other variables that often go ignored in the process.

With that said, I have yet to hear a horn I’d want to own. I remain open minded because so many people swear by them, but I just haven’t heard the right situation yet to convince me.

You have a nice setup there, but between YouTube compression, the Iphone, and my PC speakers, it's really hard to evaluate the sound you hear.