The Pure Tone Technologies stereo output jack contains dual rings for optimal signal and lowest possible noise. 100% greater surface area at all contact points creates a more stable connection; as a result, high and low frequencies are greatly improved creating a much more balanced sound while eliminating frequency spikes. No more noise crackle caused by pressure grounds. The Pure Tone jack allows for increased current handling at 500 volts for high-current applications. Tensioned design locks cable securely in place while the increased metal mass carries more signal.