The A. T. Professional 2.4 and 4.8 Digital Signal Processors feature all the necessary tools for full comprehensive control of even the most sophisticated professional audio systems. The DSP2.4 offers two inputs and four outputs whilst the DSP4.8 features four inputs and eight outputs. Both models offer crossover functions with Linkwitz-Riley, Bessel and Butterworth slopes in 6/12/18/24/48dB per Octave ranges as well as powerful equalization including high and low shelving and up to five full parametric equalizers with “Q” from 0.02 to 3 octave bandwidth for each output. When combined with the memory storage, facilitating signal routing, as well as output limiting and time delay functions on all inputs and outputs an operator can control every required parameter when setting up any audio system.