The Protech Audio Models 2004 and 2008 Automatic Mixers are designed specifically for small venues and rental service. The unit is designed around the patented Dugan Speech System. Much like an experienced console operator, the Dugan algorithm allows turning up the gain on an active channel, while simultaneously attenuating unused channels. By subtracting additional gain from unused channels, the unit reduces echo and redistributes that gain to active channels. This allows greater gain-before-feedback than gated mixers. Engineers at Protech Audio have worked directly with Dan Dugan to develop circuitry that accomplishes his algorithm economically and accurately, bringing transparent automixing to smaller installations. The Model 2004 has 4 microphone/line inputs. Two frames may be linked together to provide up to 16 inputs. For larger installations, Protech Audio manufactures the Model 2000 and Model 2000-C Automixers.