JBL horn tweeking

[Ian Mackenzie]

Guys,

Some of you may be interested in damping tweeks to sweeten those 2307s/08 or hot up your L300s.

Here is an extract of the link below fron a fellow JBL diy Guru Rodd Yamashita. Rodd has been tweeking JBL horns for 20 years and has some handy tips:



http://www.diyaudio.com/forums/showt...&highlight=JBL


"Cover the baffle around the mid-horn and the 077’s with 7mm foam or felt (remove the lens first so the foam goes right to the edge of the horn). Cut strips of the same foam and wedge them between the fins on the rear of the lens, but not more then 10mm in from the back edge. There should be a round area open to the horn mouth. This will help to control any baffle diffraction as the sound wave travels through the lens. Wrap the mid-horn very tightly with some heavy rubber or neoprene. You can use large wire ties to hold the rubber tight around the horn, the more the better.

In the photo, you can see the foam on the baffle and wedged into the back of the fins. You can also see the N7000 which I totally rebuilt with Solen coils and caps. I may eventually replace the L-Pad with fixed value Caddocks."

Happy listening

Ian