... tone controls, an echo repeat adjustment Professional Mixing Amplifier With 2CH Graphic EQDescription:The SA-7500B system ... repeat adjustment, an echo speed adjustment, a powerful amplifier, and smooth vocal sound reinforcement capabilities.In addition, the ... / 600 Ohms Input Sensitivity--------------- 300mV / 22 KOhms Output Level (Pre-Out)--------- 2.5V / 1 KOhms Mic. Freq. Response------------ 10 ...