I need advice on Lowthers

Fiddler, the imaging of the horn loaded speakers is really related to the frequencies that the horn is presenting. In the Lowther type back loaded horns, the driver is handling the mids and highs, with the horn working primarily to handle the lower mids and bass. As such, the critical midrange area is providing a point source which is excellent for imaging. The imaging problems of horns generally occur with front loaded horn designs, although I have heard of some which seem to image well. The Voight Pipes mentioned above are a very good imaging design with the point source, direct radiator design augmented in the bass with a combined back horn/transmission line in the shape of a tall wedge. This is a very easy/cheap way to get into single drivers that is very rewarding in sound quality. Also, the bass is better than you might imagine. Some Voight Pipes can get down to 40Hz with the right drivers and line length.

Dekay,

Thanks for the link. I just printed off the Voight Pipes design. Looks like a pretty straight forward weekend project.

You are welcome Doc (and thanks to TWL as well). Please give an update if you try them. I purchased my wife a car today (one that we have been searching years for) and have also been off work for two years, so it looks like I will be putting this project off for awhile. The car is a 72 Citroen ID (@ an unheard of price for the condition). I have no regrets (and hey it even has a stereo:-).