E36 M3 (1999) with HK stereo and Hifi Switch

[Black_Tire]

I am planning to install an aftermarket head unit in my 1999 E36 M3. Should the Hifi switch on the console be turned on, off, or disconnected. Just what does this switch do anyway?

[jllphan]

I am afraid I don't know what that switch does. Does it mention anything in your manual? If it is merely a stereo/mono switch for AM/FM, I wouldn't worry too much about it. See if you can find some more info...

[Black_Tire]

Here is what the owner's manual says:

In the "ON" position, the listener is given the impression of a considerably larger passenger compartment with and improved stereo effect in all seats. This function should be switched off in the case of poor radio reception due to the frequent changes between stereo and mono which result.

After listening, my installer thinks that the switch does something like the simulated dolby surround in home stereo units. I think it may play with the delays at different frequencies to accomplish the effect.

I have an appointment to have a new aftermarket head unit installed tomorrow.

[jllphan]

From your manual's description, I can safely say I was correct. It is indeed a Stereo/Mono button. As AM stations are not in stereo, and weak FM stations may fade back and forth between stereo and mono, this is merely a switch to turn off stereo...

Don't worry about it. I would just leave it be.