Crossover networks separate or join together several specific frequency bands. Crossover networks are typically used in speaker systems to separate the low-, mid-, and high-range frequencies to respective drive woofers, midrange, or tweeter drivers. These filters protect the drivers from wasteful, noise inducing, or harmful frequencies that the driver is not designed to handle. For example, there is no need to send high frequency to a woofer. The woofer is not able to reproduce high frequencies and just adds distortion. A tweeter can be damaged by strong low frequencies, thus the recommendation is to filter these before sending the signal to these drivers. Linkwitz Riley implementations are tailored to produce an overall gain of 0dB at the crossover frequency when the low-pass and high-pass filters combine together so the overall musical tone is not changed during reproduction.