As a test I bought a pair of fostex ft17h super tweeters and a aitima a07 chip amp.
Using my driverack 360 crossed them at 14k at 12db per octave in a up fire configuration
Amazing sound adding great high end
I own a pair of quest z speakers I replaced the woofers with the peerless also bypassed the crossover and used the minidsp hd Biamp the speakers what a huge difference adding a sub made it world class
I have a pair of Quest Z, just installed the peerless drivers and think the results are fantastic bass now very tight matches speed of the panels and the depth I sub
Ordered the peerless woofers and I am going to get something like dynamat to line the box and the speaker basket, moved the dsp to 300hz to 80hz for the sub