Rerurn to Romy the Cat's Site

In the Forum: Horn-Loaded Speakers
In the Thread: Practicality of paper mache horns.
Post Subject: Pulp fictionPosted by Gargoyle on: 12/28/2015
 Paul S wrote:
My results so far agree with Romy's theory, that the paper horns begin to eat energy when I used them "too low". In this case I used 4-600 Hz with 6 dB roll-off.

Thanks, this gives me somewhere to start.
I am considering adding some additives to the pulp, like sand for added mass, or rubber particles to diminish ringing. If possible.

I had even contemplated thick rubber sheets (overlapping pedals) for a bass horn, but I think I will leave that for a different discussion.

 Paul S wrote:

I hope you will share your results if you try this.

Best regards,
Paul S


I think I can start by making some square sample sheets of material while I'm planing the form. I will probably try Inlow's jig to make the form mold. It uses a drywall compound, at first I thought there may be better materials, but upon further reflection it seems a good candidate.

Most likely I will use wood glue instead of flour for the binder as an attempt to mitigate some of the drying time. I don't know how this will affect tone, but I will predict that they may sound a little different. The glue will probably result in a stiffer horn then one made with flour.

Also wooden rings or ribs could be added strategically to the exterior if need be, or perhaps spiral-wind some hemp string during construction.

I don't expect miracles, I think anything that is moderately dense is going to have some issues with resonances, short of making a "soft horn".
I also share your enthusiasm for the technique compared to working with solid wood. Mind you I will still have to get creative when it comes time to make the big horn with no lathe.

Rerurn to Romy the Cat's Site