Jack connectors are popular for musical instruments. they are
available as 2 pole or 3 pole versions. (TS or TRS). 3 pole
(TRS) versions are sometimes used to transmit stereo audio (a
left and right channel with a common ground) but in pro audio it
is more common that the TRS type jack is used as a balanced
connection. Jack connectors are often used as Insert Points on
Mixing Desks where the send and return of an insert point are
made on the tip and ring (T and R) of the jack. This connection
shares the common ground (Sleeve (S)). - Standard jacks are 6.35
mm jacks. - Mini jacks are 3.5mm and 2.5mm versions are
available. Jack plugs are sometimes used for speaker connections
in some smaller setups. Again this is often frowned upon due to
the male connectors having live terminal showing. In larger
applications there can be several amps transmitted through a
Speaker Cable. Polarity (Phase) Reverse The Tip and Ring on a
balanced jack are reversed. Some mixing consoles have a switch
on inputs and sometimes output