Housing preset tunings developed expressly to optimize the performance of QSC loudspeakers, the SC28 system controller is a 2-input, 8-output DSP device, offering user-adjustable EQ and delay. The unit is rooted in 48kHz, 24-bit A/D and D/A conversion technology with 32-bit, floating-point DSP with wide dynamic range and low distortion. Balanced, line-level, analog XLR connectors are provided at all inputs and outputs, while all DSP tunings incorporate IIR (Infinite Impulse Response) and FIR (Finite Impulse Response) filtering. System tunings can be selected by scrolling through a list of loudspeakers found on the front LCD panel and selecting the desired configuration (two-way, three-way, etc.). A nearly identical process is used to select amps and input sensitivity. New tunings can be loaded into the controller via a USB port found on its rear panel. Integral 6-band parametric equalization can be added along with high- and low-shelving filters, and signal delay. Fully password-protected, the unit also provides thermal and excursion loudspeaker protection, as well as a channel-linking feature that can be used to select linked or independent control of stereo channel settings.