Hello, everyone. I am looking to build some 3 ways, hopefully utilizing some gear I already own and adding the missing items. These will be part of a 5.1 system, but they're primary role will be 2/2.1 channel music playback. They will also be active using DSP.

What I already have:
5x 2226H
5x 2447J
5x 2381

I came across a killer deal on 5x SP215-9 boxes, so that's where the above come from.

Some questions I have:

1. Would the 2447 benefit from an SL diaphragm, maybe the 2451SL? I don't necessarily need them to play higher, I'm fairly certain my hearing above 16-17k is non existent, but smoother would always be desirable...not that I have a lot of complaints about their performance as is. I'm not made of money, so Be will have to wait for the foreseeable future. Really, I'm just curious if the added cost is worth it? Subjective, I know.

2. For the midrange, I can purchase either the 2168, 2169 or 2251 for about the same price. These will be direct radiating, no horn/waveguides. There isn't much info to find on these, or maybe my google-fu is lacking. I was able to find that a variation of the 2251 was used in at least 1 of JBL's high end systems, and the other 2 in the Vertec line, which is a completely different application from mine. Has anyone used any of the three? Any suggestions as to which one will work best for my application? The intended pass band will likely be 300-1.5kHz, roughly.

The lows will be handled by 2x 2226H per L/R, and the remaining 5th for the center channel. The 2 remaining 2447/2381 conbos will be used as surrounds, 2 way, with an undecided woofer at this time...but my main focus with this thread is the main L/R.

Subwoofers for HT use are already in place, I've got a ton of Crown amps in various power capability and DSP will be handled by a Symetrix piece. I'm hoping the dual 2226H's will provide enough low end to not need subs for music playback.

Any info and suggestions would be greatly appreciated.

EDIT: My listening time with the SP215-9, so far, has been really limited. Only a handful of hours, and not very critically. Some of the info I have been able to find about the 2447J is that they are not usable up high. The info is rather spread out, and so are the opinions, ranging from 4k-10k...the consensus I've managed to gather is that they are not good above that rather large range, which in itself I have a hard time taking without a grain of salt or two. What is the consensus here on this forum? How much does the horn/waveguide play into the upper end extension of a CD?

If anything, the area I'm not too thrilled with is in the midrange, and my best guess without taking any measurements is that it's somewhere near the crossover...hence the want to go 3 way.