Insulation in the Horns

[vrod]

Why is there no insulation in the Horns, is it because of the design? How do you deal with cabinet resonances in the Horns. Hey guys been away for two months due to hellacious problems with my Email and bellsouth.net. Like Idependance day " I'AM BACk"!

[henry]

Hi vrod, Ed knows more about this than I do for sure.  My take is that there is alot of internal structure in the Horns with all the folding present.  For such a small cabinet, there's a lot going on inside.  This makes the cabinet very robust, so vibrations aren't an issue.  Besides, stuffing a Horn would diminish the effect of amplifying the back wave (my guess  ).

Back in the day, some folks using First Watt amps did stuff the horn mouth a bit to attenuate the bass response.  The FW amps can make wide-range drivers defy physics.  For us tube guys, stuffing isn't needed.

[thehornshoppe]

Henry is pretty much correct. Stuffing the path would almost make it into a TL, don't know, never did it since you could not get it out!
The area behind the driver is a compression chamber, the area behind the driver should NOT be relieved to allow "a smoother airflow". It don't work that way!
Hope this helps!
Ed

[vrod]

I was just thinking that the rear wall of the compression chamber could reflect energy back to the the rear cone of the 126en speaker resulting in stored energy on the driver cone. I noticed when several years ago I upgraded to the 126en that there was an area in the back wall of the compression chamber with, if I remember correctly, a rubber pad (?) at the level of the speaker connectors. I thought the purpose of this was to mitigate reflected waves.