Tuning a back loaded horn

Wool works best madisound has it.Or if cheap use the poly.

What is a "back loaded horn" ? Would that be like a Klipshorn? If so, no fill is used.

Eldartford,Back loaded horns are used in many full range driver systems using lowther AER fostex drivers, others. They are more of a hybrid of TL BR and horn in a folded pathway cabinet.But a few are true full back loaded horns but even they need some tuning. When you used a fullrange you need to absold some of the back wave to prevent a peak in frequincy responce. This is what the poster is refering too.

Thanks for the response John. I try some Madisound wool.

Would I start by putting some wool in behind the driver or close to the mouth of the horn? I have a sachiko design (from the Frugal Horn website) with 206 fostex, and I want to bring the upper bass down just little bit.

I am thinking I need to start close to the mouth of the horn.

thanks
Paul