The OPT-6/70 is a 70 volt version of our famous OPT Series of speaker selectors. The OPT-6/70 features independent volume controls, on/off switches, and dedicated A/B switches for each of the 4 zones.
Designing Systems With the Constant Voltage OPT. Each channel output supports many speakers! Simply calculate how much wattage is required for each speaker. Connect no more than 20 watts to each channel out. Remember the rule of thumb is to reserve 1/3 to 1/4 of the available power for step down transformer insertion loss.