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i either need to hunt for a 2-way XO that can split mids and highs or build a custom one.
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100% - but you cannot just use any old crossover here, the company who built the speakers have an idea of how their speaker drivers react to different slopes and crossover points as well as changes to phase etc and also probably could have additional bits of features in a crossover like attenuation for tweeters etc that would probably be missing in another brand of passive crossover, so in this instance i would recommended everything being done active because with an active crossover you could select the crossover points and slopes to more or less replicate what was happening in the original passive but you will have the advantage of feeding different amounts of power to each driver as well as adjustable levels
you could still use a headunit that has three way adjustability like the pioneer, or the alpine 9887 and complement that with getting a multichannel amplifier with a built in crossover which can adjust to the points you require
so your system configuration could be for example if you had an alpine 9887 (im using the alpine as an example cos i have one of those so its easy for me to recommend settings, but im sure the pioneer or the clarion could easily replicate those settings)
sub output - lowpassed at maybe 60 to 80 hz (depending where you like it)
mid output - bandpassed by highpassing between 60 to 80hz (depending on where sub output is set at) and lowpassing at the point to where your midrange can safely take over .... lets say for arguments sake you have a dome midrange which can only work from around 800hz up
tweeter output - highpassed at 800hz - but the interconnect from this output could be physically split at the amp end with a y-splitter to feed a 4 channel amplifier which has a crossover capable of processing between the mid and tweeter - so you could lowpass the mid at maybe around 4000 to 5000hz and highpass the tweeter at around the same point
if you do go fully active though remember that the safest bet is to use crossover points at least one octave above the drivers resonant frequency unless you use a steeper slope than normal
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Now consider this,
say i am driving the XO's from the HU. irrespetive of what my Amp's XO's are, can i go for a fully active setup ? If yes, then i am game for it
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built in power from the headunit is a form of amplification, so whatever applies to an external amplifier would also apply to the headunits built in power, so either you use the entire crossover OR you forget about using the crossover altogether and go the full active route as i have described above
if you can finds the correct amplifiers then it is very easily done. For example my 6 channel SPL Dynamics S7006 has a crossover capable of doing all the crossover duties for a three way component set and that too even if the headunit had no built in crossovers and only had 4 channels of output ie for front stage and sub only, obviously id need another amplifier for the sub but with a front input only i have a switch that could configure the entire amplifier to work with only two channels of input ie feed it only left and right, and have that expanded into three sets of left and right by flicking a switch and it has crossovers for all channels adjustable from 40hz to 5000hz at 24db/octave slopes
So you are only limited by the type of equipment you can find but there are more than one ways of doing things that will work well and for me i find that the system design aspects are best done in the planning stages because once you have bought equipment you are committed to only what that equipment can do