The drive rack includes all of the system processors that connect between the mixers outputs and the amps inputs. These processors maybe graphic equalizers, compressors, a crossover, limiters and time alignment delay; what the drive rack provides is the ability to tweak the system for better performance and add extra functionality.
Graphic EQ allows for the engineer to ring out the sound system sweeping through different frequency bands pre-gig at a venue. This in turn can help stop feedback through the mics and monitors and help improve the quality of the live sound.
Compressors are used for dynamics of the sound; compressors use ratios between 1:1 and 10:1 and the resulting effect of compression is that the peaks of the signal that are the loudest and generate the most voltage are turned down and the low levels within the signal are turned up; the overall amplitude of the signal can then be increased or decreased using the gain on the compressor. A compressor is ideal for the likes of drums i.e. kick and snare as the drummer may not always play at consistent velocity.
A crossover is a great add on to a sound system, its basic function is to send the low mid and high frequencies to the subs, Mids and horns. This allows for better control and optimization over the sound system. Using a crossover gives the sound system its full potential and allows the system to possibly be driven harder.
A time alignment delay is used when a distributed system in used in a large venue or fill speakers are also used. This processor allows for the signal to be delayed in milliseconds to selected speakers stopping a delay and phasing between the speakers.
The disadvantages of a drive rack are the expensive processors and extra cabling needed for live sound gig although the advantages far out way the disadvantages.
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