Here's an interesting take on this matter-
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Originally Posted by RichardP1
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Originally Posted by UKenGB
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Originally Posted by RichardP1
The "output to amp" is true if you have anything but the standard audio, if you have any Amp (e.g. DSP) then the radio speaker outputs go to the amp (which accepts speaker level inputs).
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I don't think that's true. AFAICT, if any amp is connected the radio module actually outputs line level signals. Only if there's NO amp does it output speaker level. Clever or just complex? |
Just a normal characteristic based on the load that the amp is driving. Speaker loads are relatively low impedance (usually 2 or 3 ohms on BMW's) whereas amp inputs are higher impedance, if the amp is designed with this in mind then it will drive both types of load. |
In which case the radio module could drive a third party amp without having to fool it into believing the OEM amp is connected.
There is still the issue regarding the output varying with volume depending on whether it's a DSP amp or other, but if this is true there's no need for any Speaker->LineOut converter. There would just be the DC bias to take care of. Not sure if that's better or not.
Could do with the experts offering their insight on this one.