Re: Installed components - need gain help
Your crossovers should be blocking the sound of a 1 kHz test tone from the tweeters. They use a 3.5 kHz crossover frequency with an 18 dB/octave slope. This means at 1 kHz the sound is attenuated more than double the loudness. You may have the gain set incorrectly as I suspect you're hearing distortion created by the head unit and possibly from the amplifier as well.
You'll need to listen to music recorded with live instruments to judge your settings by ear. If you're setting the gains with some dubstep playing that isn't going to help one bit to tune for natural sound. It would help you judge where to set the high pass filter for the mids.
New online business launching soon. Specializing in car audio system designs and sales for those seeking great sound.