You can build a measurement mic for just a few dollars, and, LspCAD and ARTA both have free demo versions, also here is totally free measurement program:
Thread: http://www.diyaudio.com/forums/showthread.php?t=144984&highlight=holm+impulse
Download: http://www.holmacoustics.com/holmimpulse.php
Here is an excellent link regarding designing speakers with "software only" (without measuring):
http://www.geocities.com/woove99/Spkrbldg/DesigningXO.htm
Here are a couple interesting two-way designs from which you could get ideas that you could apply to a 2-way Peerless 830884 design:
http://www.audioheuristics.org/projects_gallery/RS225_RS28A_updates/dayton_reference_rs225.htm
http://audioheuristics.org/blog/?cat=7 ("ER18DXT")
I recently got a pair of 830884s to test and measure myself, will most likely use them in a 3-way similar to Augerpro's "Delphis", just with a different tweeter. I've had the MDM-55s for quite a while planing to do a "Duelund" type design also. The Peerless 830884 and the Dayton RS225 would be my top two choices for 8" woofers. For an 8" in a two way, there might be "easier" choices, such as this Seas for $59: http://www.madisound.com/catalog/product_info.php?cPath=45_228_257&products_id=834
EDIT: I've heard the RS225 in a few designs and always really liked it, I'm very curious to compare the 830884 to the RS225 in side-by-side listening - I don't have any RS225s myself yet, hope to get some soon.
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