The crossovers built into most amps are ok, but for efficiency sake, I like to pre-amp filter so the amp isn't concerned with what it doesn't need to be concerned about.
So to answer the question (that was wicked buried in your post):
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I am curious to know what gear you are running in particular that wouldn't work to its full potential without including a line driver with the rest of the system.
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Any time you are putting a full range signal into an amp the is not going to amplify the full range, it is not working to its full potential. The line driver is only a nice feature, it's the pre-amp filtering and splitting of the stereo signal that I am after.