Side firing bass designs - Pros & Cons?...

Dawg,
That, my friend is an excellent question. The Pipedreams use a proprietary 'series/parallel' wiring configuration which ameliorate the lobing effects which is what you are asking about. Otherwise comb filter effects would cause a disturbing cancellation, pattern, which would make them very non linear.
The designer, who I know, won't talk about it in any detail, and I am honor bound to not discuss it more than I have mentioned already.
I hope this is enough to answer, what I consider to be a very good, and intuitive question.
Best,
Larry

You'll get comb filtering no matter what you do when using multiple driver arrays, but that can minimized by careful design and wiring. I ran across a website that was mentioned on Madisound when doing research on line array's that goes into detail regarding comb filtering, driver size and spacing, crossover frequencies and slopes, etc... I printed it out as it was worth having around. If i can remember correctly, the website was run by a gentleman by the name of James R. Griffin.

While i can't find his specific website, i was able to find one that had his work along with that of a lot of other line array advocates all compiled together as various downloads. At least some of Jim's work can be found here and is titled something to the effect of a "linus array". Sean
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Line Array information

Other than the AR 9's, 90's, NHT, Vienna Acoustics and Coincident Technologies, i can't really find any other speakers that made use of side firing woofers. I'm not counting Allison's and DCM Time Windows, as the woofers weren't so much "side firing" as the woofers were not side mounted so much as the cabinets were twisted sideways. Other than that, the only other thing that i can find was that EPI had a speaker that looked quite similar but used dual passive radiators where the 9's and 90's had active radiators. These were driven by one active 10" that was mounted up where the AR's mounted their 8" mid-woofer. If i can recall correctly, i think the EPI was a model 500 and made use of their popular and good sounding inverted dome.

Other than that, there might have been another company out of Europe selling a speaker with side firing woofers. I think i remember seeing some in one of Jerry Raskin's Needle Doctor advertisements, but i'm not certain. I thought i saw something about it using a Hiquphon tweeter, etc... Sean
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PS... I'm not including the Fluance ( Flatulence ?? ) speakers as found on Ebay in this list. I have a hard time believing that someone can build and market 4 and 5 driver towers of any quality for well under $300 per pair. Then again, who knows. Maybe these would shock me in regards to what they offer for the money. I kinda doubt it though : )

I think the key here is, 'minimized'.
Loudspeakers are all imperfect to me, versus real music.
The pipes do some things really well. Mostly micro, macro dynamics because of the drivers redundancy, plus the lack(make that lessening) of the earlier mentioned driver air displacement distortions.
The designer is tight lipped enough on this that he may have come up with the formula to make his filtering less than previously thought possible. Who knows?
They are great, though, in some ways, not all, of course.
Larry

Sean, check out Israel Blum's side firing designs. He places multiple drivers on the side. Thanks for the line array web site it looks very informative!