I have a pair of walnut veneered cabinets with JBL D123 woofers, some tweeter I can't identify with a large vintage 4mfd capacitor for each tweeter. There is a square cut out in the top of the front for the tweeter. I believe it to be a cone tweeter. There is a port measuring 13.25" wide by 2.25" tall for @30 sq.in. and no duct or tunnel. The interior space measures 2.292 cu.ft. Using the port charts on this website I should have a 13 sq.in. port with a 2" duct by one chart and 20sqin with a 5" tunnel.

Should I modify the port to be smaller and add a tunnel? If so, what length and sq.in.? I probably should replace the wiring and capacitors. They are a Mallory and Aerovox. I do have a pair of Magnavox horn tweeters I could replace the smaller tweeters with. Any ideas?

I did take some photos earlier, but can't find them. Maybe on my other computer. Thanks for any help.

Bo