Zapco ASP-Q2 7 Band Parametric Equalisation EQ/CrossoverASP Q2 7 Band Parametric EQ Crossover The ASP Q2 was not designed to be an accessory toy for the dash. It was designed to be an effective tool in tuning and controlling the sound of a car audio system. With 7 bands of parametric equalization you can put correction at any points in the frequency spectrum. The separate bass level lets you balance the bass to the highes. Each channel of both Main and Aux input has its own input signal adjustment.