These should be plenty bright-I have some and even with the presence and brilliance knobs less than halfway up there is lots of treble.Determine that the tweeters are working. If you can't hear them, make sure they're not blown. if they are still good, clean the L-pads with a good quality solvent like De-oxit (you will need to remove the crossovers from the cabinet- don't just spray stuff "at" the pots) and rotate the pots several times to disperse the cleaner. if that doesn't help, the L-pads may be toast- replace them.
