I don't know about the whole tri-speaker thing.. I've got 4 Jensen 6x9's that are triaxle (the woofer, the mid, and the tweeter) and these things produce some of the loudest, most crystal clear music I've ever heard. right now I have them hooked up to my home unit (I know.. not the KJ, so irrelevent, but still) and you can just crank it and crank it and these things WILL NOT distort. they just get louder and louder, and the CLARITY of the sound coming from these speakers at such a high volume is just unbelievable. when the reciever is at maximum volume, you're just standing there going "holy shit.. how is this possible from a 6x9" It's truely something you'd have to witness.
now, when I tried to install them in the Jeep, hooked to a 4 channel 600w amplifier, yes they were loud, but they just didn't seem to sound correct. the highs sounded muddy and the mids and lows sounded like someones ass exploding.. so I put them back on my home stereo, and they continue to amaze. something tells me I wasn't feeding them enough watts with the little 4 channel amp.
I, too, would like to try and find a solution to my audiophile needs in mah Jeep. What if I purchased two sets of component speakers (4 woofers and tweeters, 4 crossovers) installed them into the front doors and dash like normal, and perhaps place the other two woofers in the back doors, and mount the extra two tweeters on the dash somewhere? would that be too much highs for the front?
I've already got two rockford fosgate 12's in the back, which are drowning out my worthless stock door speakers. I've got the amp turned down about half and the sub volume on the CD player set at -10 (-10 - +10, and ATT (off) ) and they still thump too loud. This is only a 760 watt pioneer amplifier im running the subs on.
need moar highs, mids, and door speaker bass!
PS: I also have the crossover on the CD player set so that the door speakers don't try to produce the really low notes found in some songs, this makes it so I can listen at a louder volume without worry of distortion.. but because of this, theres a gap in the frequencys. it goes from highs, mids, mid bass, (huge lack of low bass from the doors), and then the subs. with the subs off and the cross over off at a lower volume, it sounds marvelous.. till about half volume, then they start takin a shit. I want a setup where I can get a bit moar lows (not much, just enough to fill the gap) from the doors.