JBL LSR28P, Technical & Service Manual

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The third method of connecting signal to the LSR28P is still an unbalanced hookup and is a
variation of the above XLR method by using a two-conductor cable or RCA cable with two XLR
adapters at each end or two Tip/Ring/Sleeve connectors at each end.
The Tip/Ring/Sleeve connectors are also commonly referred to as 1/4" connectors and can be
used with the LSR28P's Neutrik connectors. The popularity of TRS connectors is related to their
early use and acceptance within the consumer audio industry. The tip of the TRS connector or
the center conductor of the phonograph cable is the “hot” lead and should be connected to Pin 2
of the XLR connector for signal transfer. The use of the RCA connector is, by far, the least
expensive method of hookup, the noisiest and most problematic, too. They are simply two
conductors one hot and one cold, however, they do connect both grounds together and have
caused many problems including damaging equipment. They are not recommended for
professional sound systems.
THEREFORE, IT IS HIGHLY RECOMMENDED THAT THE TECHNICIAN USE A
THREE-CONDUCTOR CABLE WITH XLR CONNECTORS TO CONNECT THE
PREAMPLIFIER OR SOURCE TO
THE LSR 28P MONITOR