GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.

Post Subject: Midbass Adjustable HornPosted by Saturntube on: 8/8/2009

I have been running around this design for a couple of months...I re-designed it just now to change some numbers according to your post. The main idea is to have a lot of posibilities in a huge horn:It is formed by conical sectors that are not too heavy and can be easily moved.These conical sectors follow a design curve (hiperborical, tactrix, exponential).Once it is put toghether it is supposed to be light enough to move it and place it properly in the room.When all tests are final and it is positioned, it can be sand filled to avoid resonances. It also has the posibility to change throat diameter and its according lenght.It could even have the posibility of taking out the last sector in order to change it from say 160cm to 2 m mouth.(though we get far from the original curve, thats a price to pay)This could help out in choosing the right driver, or the right load for the driver. The first part, smaller and closer to the driver is made in turned MDF in very much the same way the upper bass horn is made.This damps resonances and does not contaminate magnetically the sorroundings of the driver.The throat can be adjusted by very small increases even, by taking out the first couple of MDF rings. The bigger sectors are conical and with a center chamber to be filled in with sand, these are made from sheet metal welded to thicker flanges that can be bolted toghether.The metals can be Aluminum, Stainless steel, or normal cheap magnetic, corrodable steel for testing.... I have made some Water tanks in sheet metal, and even a couple of conical upper bass horns, and I can tell it is very doable!I might have the space for testing it in a couple of weeks... But I dont think I could really fit them in my listening room. I am closing a transaction for a pair of WE 555 drivers in very good shape...so I might try them in a bent version, I want to see how low and high up they will go with a nice tone.. and build from there. Those snails look pretty complicated... If I make it to your place, would you let me scratch the cone of that Vitavox driver too!!!

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