way to rain on my parade! what are some cheap drivers with the correct values then?  hehe I am majorly bummed that I don't get to build these but thankful for you guys saving me some time and MONEY!

yep, you got it.  Is that the Selenium 15pw5-slf you are talking about?  Its in my PartsExpress catalog for $89 (a lot more than the speakers you wanted to use).  However you are probably talking $400 worth of materials to build your Imperials, so filling them with $25 speakers may not be the best bang for your buck.  If your going to spend $89 for a speaker, I think you might do better on Ebay.  You can sometimes find JBL E-140's in the $60 range which will put it up to $90 when you add shipping, and yea its a risk but I've bought a lot of good used speakers off Ebay (just be sure you get the shipping insurance), and a JBL E-140 has Fs/Qts = 32/.17 = 188.  Here is a link to the thiele - small data base which will help you out:

http://www.thielesmall.com/database.asp

(read the directions - I only enter diameter and brand)
Good luck.  Again, your probably only talking 1 speaker per (full range) Imperial that needs the high Fs/Qts.  The other needs good frequency response, ideally a coaxial.

Braggi and all

See my post in the "Scorpion Vs Black Widow in Imperial" thread for some pictures and my story.  The pictures have changed a little from the descriptions in that post as I figured out a way to fit dual 18's in and thats what I'm running now, dual Cerwin-Vega 18's on both sides.

That site looks quite a bit cheaper! thanks for that, I noticed all of those woofers looked alot liek some better known companies.

actually, i was hoping to build it myself, but i have run out of money and i had trouble selecting cheap, usable drivers.

Ive seen bigger magnets on my fridge

[quote author=j_rock777  link=1122076674/0#0 date=1122073074]Does the larger flare of Steve'd horns increase efficiency? [/quote]
This is kind of an old thread but since nobody answered this question I thought it might be nice to get a discussion started.  It seems to me that since the larger mouth will permit the horn to play a broader spectrum, it will therefore play not as efficient as a one which was concentrating the driver's power into a narrower range.