Known impedance for use in loudspeaker measurements
An impedance box is necessary for measuring the impedance of a loudspeaker. Listen Inc.’s impedance box contains a 0.25Ω resistance. This value is suitable for most loudspeakers, but may be easily swapped out for a different value by the user if speakers with a particularly high or low impedance are being tested. It is available with either XLR or 1/4″ balanced connectors. Please specify type of connectors when ordering.
If you are using a Listen SC Amp audio amplifier or AmpConnect ISC all-in-one test interface, you do not also need an impedance box as it is included within both these products