I just purchased a mp3 deck (JVC KD-S890) to replace my stock cd/radio/cassette head unit. One guy at the installation store said he needs to do the amplifier by-pass when installing the unit and it'll cost $50(us) to do so. However, another guy at a different store said all he has to do is disconnect it in the wire hardness and it would not cost any extra to do so.
Can anybody confirm this? Does he really need to by-pass the amplifier?
thanks Brian