The short & simple answer is that line drivers take the output of whatever your source is and increase the voltage without otherwise changing the signal. You therefore get a higher volume output without having to...Originally Posted by 3onDubs
A: overdrive your source (causes clipping)
B: overdrive your amps (causes clipping)
The end result is that line drivers are a good thing (assuming you get one worth a crap). You know how your stereo sounded (like crap) before the days of amps when you turned it all the way up to get it loud enough? The same applies here. The sound coming from your puter is much better if you leave those sliders at midrange and use a linedriver to increase the voltage of the source signal before it reaches the amp. Ideal is 7 to 11 volts...my choice being the linedriver/eq/crossover half-din dash unit by Memphis. The advantage to that unit is it has separate controls (rotary knobs) for main volume & subs, so if you wanna pump out the bass you can, but if you wanna turn the subs all the way off (or down), you can do that too without climbin in the back with the amps.