900hz Smith Horn for 1.5 Drivers

[John W]

I just finished a pair of smith horns for a pair of 2345 drivers, and did some measuring this weekend.

I started with the design drawn up by yggdrasil in the 1200hz thread. http://audioheritage.org/vbulletin/s...ead.php?t=5454, then scaled it up for a 1.5 in driver, which comes out to 900hz. A lot of the design aspects are covered in the original 1200hz thread.
I’ve attached the spreadsheet with the modified numbers. If you have a hard time deciphering the spreadsheet, basically:

• the horns are an arc with a 12.75 inch radius
• fins are 7.29 inches long and 1.18 inches high
• the throat is 1.5 inches diameter

These horns are mahogany and the material is 1in thick.