JBL Control 1x Personal Monitor Speaker System (Pair) (Discontinued by Manufacturer) For over 50 years - before audio components became popular - JBL has been manufacturing speakers The Control 1x is an ultra-compact speaker that can be placed virtually anywhere Works with most stereo or home-theater amplifier or receiver components 2-Way sound distribution using a 4-Inch bass driver and a 1/2-Inch Titanium-laminate high-range driver A crossover frequency of 4000 Hz results in excellent distinction and clarity among the high and low frequencies