Why do you think you'd need a line driver? What problems do you currently have?
If you have no issues with noise in the amp at higher gain settings then a line driver will do nothing for you.
^^^ DING DING DING!!! we have a winner!......
what "kenwood" would you be referring too OP?
see, nothing agains this specific OP, but as a general/genric rule, it should be required that if you ask a question about how X, Y, or Z will bennefit a given system, then it is the responsibility of the OP to give a complete break down of said system.... If you told me you were running old school Eclipse or Audio control amps, then hell yes a line driver will help with a current Alpine HU. If you told me you had a Zapco, Linear Power, Alphasonik/US aCoustics etc amp, I would reply as above... if it ain't broke don't mess...
most important is DETIALS...
Rob