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Ron Clarke Horns


Ron Clarke has brought us some of the very best modern Horn designs for Fostex drivers -- the Dallas II for the FE206e, the Austin A166 for FE166e (seen here with FE168eSigma), & the Austin A126e for the FE126e as well as having a hand in the development of the Frugel-Horn.

Ron's Horns have brought the concepts of the curved mouth, the deflector, and the supraBaffle to the fore. All 3 of these have been tied together in the Austin Horns. There is more information on what these features bring in the
Frugel-Horn documentation.

Ron uses some very sophisticated tools (see Ron's comments below) that allow him the visualize the airflow in the horn. This, and an open-source model that encourages user feedback has engendered a line of finely tuned horns -- none of them a rectangular box.

Austin A126 (with non-standard supraBaffle) & 2 examples of Austin A166

Insides of a Dallas II & Austin A166. The last 2 pictures of executions using smooth curves, the Dallas in kerfcore, and the Austin "layertoned" (ie made of a stack of CNCed MDF)

  Actually i have never built one outside of a test horn that was used to accumulate data and it wasn't the Dallas II, but a step up from the original Dallas.

Neither have i built or heard the A126 or the Austin 166. All my designs are computer simulated from a program that has undergone continuous change for over 2 years.

When i first got into Single Driver Full Range Back Loaded Horns (SD FR BLHs) i built around 10 different horns all based on the figures established by the greybeards, and even some from GM, and later i borrowed some of the math from Martin for the TL action. During these builds i went thru extensive testing using pressure sensors mounted inside the horns and established a great deal of data. Later i incorporated a basic program which was established to measure pressure surges in petro chemical vessels. This program was extensively modified to act with the data i had accumulated and the different medium that the wave travelled thru. The program is still being changed and if it will ever reach an end, i have no idea. The last major change came about when Dave (planet 10) and Chris remarked on the compressed sound effect of the A126. I thought the programming was correct, but when i investigated further i realized there was an error in the BW of the horn vrs the baffle step. The answer is an increased CC and the supra baffle.

All went to show me that i wasn't as smart as my boss thinks (if ya cant stun them with brilliance, buffalo them with BS is my motto). Now i really have poor programming skills, but a fair handle on math and some physics, so i have a young kid who is an exceptional programmer actually do the work and all i do is say " incorporate this or change that" and he really does the work, not me.


I would highly recommend baltic birch over MDF for any Full Range design.

YES! After undergoing a fight for my life for the big C in my lungs i would go with BB ply as MDF dust is just plain old bad for living things. Besides it takes weeks to clean up those fine particles that gets into everything.

Plan Documents



Austin A126

  Fostex FE126e

Austin A166

  Fostex FE166e

Dallas II

  Fostex FE206e

Ed Horn Deflector

  Add-on Deflector for the Hornshoppe Horn / 15-april-08

Note: these are plan documents assembled from various bits & pieces that were gathered from various places on the web. I will be working with Ron to get prettier, more consistent (& up-to-date in some cases) drawings