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James,  you said that “Romy seems sure that Line arrays will only work properly when used on the long dimension of the room”, still you do not defined what it “only work properly”. Wherever you put the woofers they will work – the question would be where they produces less alinearity and where will inflict more positive influence to imaging. I say that along a long wall.  The LF arrays along a long wall produce better (WAY better) imaging and crate less standing waves in a room. The expense of the pro false is fine but I see a little correlation with what we do in hoe audio. I personally was successful with arrays only across the long walls. As far as I know the none-moronic high-end companies that the make the LF line-array-like speakers came to the same conclusions - I mean the Dunlavy speakers and the Australasian Duntech. Anyhow, James it will be very sample to check. When you bring the arrays home try both long and short wall positions. Listening for the imagine and the looking of your TRA will clearly tell you what to do.

I do not agree with John Murray’s “In order to act as a line source”.  I do not know also how he can advise on a crossover point without having a whole picture what you do.  Also I very much disagree that LF channels care no stereo information. Perhaps if you build a LF resonator that sits below 20Hz with 4th order then it might be the case. But an auditable sound does care stereo. John illustration about the ears is correct but we do not perceive LF by ears.

Make an experiment and confirm for yourself. Take an playback the goes in it’s room down to 40Hz. Add to it a regular consumer subwoofer, crossed relatively sharply at 40H for instance. Place the subwoofer on the right. Then take a good stereo recording with an orchestra that position with all cellos and double bases are at extreme right from a conductor. Play the playback and get some reference. Not move the subwoofer on the left. Pay attention how higgledy misbalanced the Sound become. I mean everything is the same but you for whatever reasons feel very space-disoriented and you will have that feeling the something is not right. Try it, I did it many times. BTW, there is an irony in it. If you “get” that in the given recording the basses should be on the right then immoderate turn yourself back to the soundstage will give you a feeling of short relaxation….

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