[QUOTE=Compelica;3375622] I get it now. I wasn't aware that the high, bandpass and low filters are 'hardcoded' to the front, rear and sub outputs respectively. But I'm pretty sure my door speakers are playing what they should. Regardless this warrants another look - I'll do a test on the crossovers later./QUOTE]
It takes some pre-planning and proper equipment selection, but I see no reason why you wouldn't be able to have a four-way system with your head unit that you have purchased. Tweeters on the high RCA channel outputs, mid-range AND mid-bass on the mid RCA channel outputs, and subwoofer on the low RCA channel outputs. You could run new sets of wires to the tweeters and midrange drivers in the dash and then power each pair of OEM speakers and your subwoofer on 7 or 8 channels. Of course, this would mean installing more amplifiers to separate all of your speakers from each other, but as long as your amps have additional built-in band-pass crossovers it will work. You'll have more adjustment potential if you use your new head unit in 3-way networking mode with the addition of more crossovers to work with. But this is really getting into more expense than what it looks like you're wanting to do.
For example:
I researched this system and planned for the best system build I have ever designed. I decided that the rear 3" speakers will not be needed in this build so they have been disconnected at the head unit.
I have replaced the rest of the stock speakers with aftermarket Dayton drivers, no passive crossovers in this system at all.
What I did with my Pioneer head unit was to set it to 3-way network mode and then split the mid-range outputs at the head unit, running two sets of RCA cables for the mid-range and mid-bass, along with the high and low RCA cables to the trunk where all of my amplifiers are. So I have a total of four sets of RCA's running back to the trunk for signal inputs to three amplifiers. One four channel amp for the tweeters and mid-range dash speakers, one two-channel amp for the door speakers, and a mono-block amplifier for the subwoofer. That's 7 channels total.
First, I set the high channel high-pass crossover of the head unit to 5000 Hz, for the amplifier powering my tweeters.
Then set the mid channel band-pass crossovers of the head unit for 100 Hz high-pass and 5000 Hz low-pass to give me the frequency band for the amplifiers that I want the mid-range dash and mid-bass door speakers to play.
Then set the low channel low-pass crossover of the head unit to 100 Hz for the subwoofer amplifier.
From there, I further set the dash speaker amplifier's built-in high-pass crossover to about 400 Hz, and the door speaker amplifier's built-in low-pass crossover also at 400 Hz.
I set the subwoofer amplifier sub-sonic filter to about 20 Hz.
These are my initial settings, and time-alignment is a major benefit in this head unit also to be able to have every speaker arrive to my ears at the same time. But the drawback with splitting the mid channels from the deck was that I can't time-align the mid-range dash and mid-bass door speakers separate from each other.....HOWEVER, due to the fact that where I sit in the driver's seat, the door speakers and the mid-range dash speakers on the left and right side are almost equidistant to my respective ears, so there was no need to time-align them separately. It just by chance worked out that way.
So as you can see, it takes a lot of planning and proper gear selection if you really want to go all out on one of these systems. It's definitely not impossible, it just takes work. And personally, I think the OEM speakers are actually pretty decent in these cars. The electronics powering them, although sufficient for some, may not be for everyone else. But I have yet to see anyone leave all of the stock speakers in place and only upgrade the amplification and signalling. That would be of interest to me.
If you go here,
https://www.ft86club.com/forums/showthread.php?t=141784
you can see the beginning of my build. I will soon be updating that thread with some recent pictures as I just got my sub enclosure roughly set in place last night.
[QUOTE=Compelica;3375622] Getting stuff from where I'm from is difficult - the PS95-8s are at least twice the price here, but it's still considered cheap compared to other higher end stuff. You guys are fortunate
/QUOTE]
Strange how that is, since almost everything we get here in the States in regards to inexpensive mobile electronics and speakers is manufactured in your part of the world.
You'd think that a boat could easily stop in Malaysia on it's way here from China in order to make a drop off. But then again, I'm a technician not an economist.