Which brand of separates are known to be mellow and smooth particularly on the highs? I don't like brands which have highs that are to harsh or bright.
focal utopia. damn expensive, but you get what you pay for.
btw, 'brightness' is usually caused by equalization/treble levels not set to your taste, or possibly improper placement. while there are some separates with a reputation for being bright (like mb quart), in my personal experience a good equalizer cures any harshness.
good call on the infinity brand. i used to have the infinity 'kappa' series and it was very, very good for the price. i definitely would not characterize the sound as overly bright. i would say that the mid + tweeter has very good range and excellent reproduction, especially for vocals.
I recommend Peerless separates installed in house by"The Source".
It has a very smooth, warm sound, its has crystal clear vocals and tweeters that sing not tweet. Stereo imaging is great. Way up high and in front if the windshield.
My equalizer & bass treble settings are flat in my car installed with Peerless separates.