Dolby Pro Logic is meant to roll off around 5-7KHz on the high end, getting a tweeter should be easy then.

Horn response of the tractrix loaded with alpha 6, way outdoors 1m on axis:

I guess I could use it to 1.4KHz. Should I use a horn tweeter with it? I dont want another horn/comp driver combo, too much effort (and money). I guess I just want to use these tractrix for something, as they are sitting around doing nothing and I put a lot of work in them (unlike the easy conicals I did haha). would need to buy another pair of alpha 6's.

I would have posted this on the home theatre roundtable forum, but it appears very little people go there :(

Adrian