Cheaper hard domestic tweeters are generally shrill, though I don't consider guitar solos necessarily tweeter duty. They add to the overall image and bring out the top end, but in tuning my system per speaker I've noticed most of the depth generally is coming from my mids (3 way active). It is all about ensuring proper tuning regardless of the driver. In my system (soft dome tweeters with only 65 watts rms), I tuned the upper ends of the tweeters down, and I had to back the volume off on the tweets vs the mids and midbass because I'm honestly convinced that at the volumes I listen to they would make your ears bleed. No joke man they can get insanely loud and way too bright. If you are running passive then the tuning and volume of tweets is limited by the crossover.