I know there are a lot of threads covering HK upgrade info already. I've read pretty much all of them, they have been really helpful but I still can't find the answer... My car came from factory with HK audio. The front speakers consist of a 3 way set up consisting of: 1. 6" midbass in the lower door 2. 2.5" midrange in the upper door 3. 1" tweeter in the upper door The 2.5" midrange has blown, i considered a vifa replacement driver but decided to upgrade the front speakers for some aftermarket components. I have a set that fit the E46 without adapters and are rated at 3 ohms. I'm only looking for adequate sound that doesn't buzz because of blown speakers so i'm not interested in upgrading the factory HK amplifier. From factory the HK amp has an inbuilt crossover and splits the audio frequencies and sends the corresponding audio to each of the front 3 drivers in each of the front doors. This was quite clever as it saves on weight by not having separate passive crossovers for each speaker. But this has also posed a problem now i want to replace with aftermarket components. Usually i would take a full range speaker wire to a passive crossover and connect each of the speakers to this. The passive crossover would ensure that the correct frequencies are sent to each of the drivers. But there is no single full range wiring going to the front speakers. So whats the best way of wiring the speakers? I think the aftermarket crossover is not needed. I can wire the 6.5" midbass direct to the factory wiring. I can also wire the 1" tweeter directly to the factory wiring. But then i'm missing a 2.5" midrange unit. What frequencies would this cover in the oem setup? Is there anyone else out there that has only upgraded the front HK speakers without the amplifier, if so what have you done?