About the JVC KS-U57
The KS-U57 adapter allows you to connect an auxiliary source (portable cassette, MiniDisc, MP3, mobile VCR, etc.) to a compatible JVC in-dash receiver with CD changer controls. The adapter converts the J-Link CD changer input on the receiver to stereo RCA audio inputs.
Important Note: When the KS-U57 adapter has been connected to the head unit, a CD changer cannot be used.
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More details on the JVC KS-U57
General Overview: This line input adapter may be used to add an auxiliary input to any JVC head unit with CD changer controls and J-Link changer interface. This adapter allows you to connect an external audio source, such as a portable MD player, CD player, cassette player, or mobile VCR to the JVC head unit. The adapter connects to the J-Link CD changer input on the head unit and has RCA stereo audio inputs.
Note: When the aux input adapter is connected to the head unit, a CD changer cannot be connected.