This is the introduction page for the Smith Chart, giving a tutorial on Smith Charts and the application to impedance matching. From here you can click the links to enter the Smith Chart tutorial pages, and learn about impedance matching for antennas.
OSD Audio SVC405 300 Watt In-Wall Impedance Matching Volume Control Knob with A/B Switch
World Premiere! Wyred 4 Sound DAC-2 DSDse DAC.... Bulletproof across all formats I could find. Great remote with a comprehensive menu, multiple inputs and outputs with impedance matching using gain controls. www.EnjoyTheMusic.com/magazine/equipment/1013/wyred_4_sound_dac_2_dsd_se.htm
Russound - Impedance-Matching Volume Control Knob - White
Impedance Matching, Speaker Wire, Speakers, White P, Knob, Music Speakers