[jostber]

Check out the PureAudio Trio10 Mundorf speakers:

http://www.pureaudioproject.com/trio10-open-baffle-speakers/

[ebag4]

GR Research here on AC has several narrow OB options.  You will have a proven design going this route which has worked best for me.  I don't have the time to Rebuild speakers multiple times, I have been incredibly happy with my 4 GR builds, one of which was not OB.

Best,
Ed

[nicoch]

http://www.quarter-wave.com/OBs/OB_Design_Part_1.pdf