![]() If the eq was set in the head unit to protect the basic speakers there would be an awful lot of correction to do to the signal in order to drive the subs of the Top HiFi. There must be some form of crossover or aggressive eq to stop them getting low frequencies which they couldn't handle. The thing that currently does not quite compute is the rear mids. I had the Harman Kardon in my e46 coupe and I was never aware of needing to fiddle with the bass and treble as I increased the volume and I imagine we are looking at a similar set up here. ![]() I think there is then another circuit in the posh amps (either a fixed one or a fancy variable one with the DSP option) that effectively corrects this - or perhaps simply boosts the bass. I'm feeling pretty certain that the eq is programmed in the head unit to protect the factory speakers so that as the volume increases the mid and top (relatively) increases relative to the bass signal. ![]() This is just making sure that each speaker gets a range of frequencies appropriate to its type. 10 of them as opposed to the 6 on the un-amped version). Those crossovers would be for each individual speaker (i.e. When you refer to crossovers in the amps I think your talking about something else. Otherwise there would have been loads of different upgrade codes and options with restrictions on what can go with what. I can't say with any surity but it seems likely that the head units would be the same regardless of the amp/speaker upgrade options.
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