Many Vehicles today are already equiped with factory amplifiers. When upgrading to an aftermarket radio, integration with these "premium sound" amplifiers is generally the quickest and simplest way to adapt an aftermarket radio to a factory system. Most factory amplifers are six or more channels but use a four channel input at a low signal. Metra's integration harnesses include a color coded set of four male RCAs which can be used to feed a low level signal into the factory amplified system. To obtain this low signal, line output converters could be used in conjuction with the speaker outputs of the aftermarket radio, or ground loop isolators could be used along with the pre-amp outputs of the aftermarket radio.
Description
Metra 70-8591
BMW 1990-up
Plugs into OEM Radio wiring harness
Applications:
BMW
1990 - 2001 3 SERIES
1997 - 2001 323
1997 - 2001 328
1990 - 2001 5 SERIES
1990 - 2001 7 SERIES
1997 - 2002 Z3
1998-2000 M Coupe
1998 M3 Coupe
