Aquí quizás veas el esquema más claro:

In order to work SW needs a connection between the output and the input of the sound card, and the device to test (DUT). There are three types of connections depending on what we want to measure:



I suggest to use bi-polar shielded cable, 2 x 0.75 mm, well made connectors and keep short the cables that are to be connected to the sound card, Line In and Line Out, while there is no length problem with the DUT cable. Be careful when soldering the minijack: remember that SW use the left channel as REFERENCE and the right one as DATA.

In the following pictures the red cable is right channel; the white is the left channel; the black is the ground while the light blue squared cable is the one connected to the DUT.


As you can see my JIG is very easy to build and we can use it as LOOP or IMPEDANCE CABLE just changing a piece of cable with a resistor:

IMPEDANCE CABLE:
Claudio Negro's home page, how to project and test a loudspeaker using Speaker Workshop

...extraído de este otro hilo:

http://matrixhifi.com/foro/viewtopic...dir+impedancia


Un saludete