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Tapped Horn "Proof of Concept #3.1"

last updated: 17 August 2017

 

Introduction
This is just a minor update to my POC3 TH design.  I basically replaced the Dayton PA310 driver with an Eminence Kappalite 3012LF-4 driver.  The Kappalite's greater Xmax and lower impedance not only will increase the TH's power handling capability, it will also make it a better match for a portable PA system driven off of a 12V power source (e.g. car audio amplifier), which is how I use it for the most part these days.

The HornResp parameters are as follows:

POC3.1 - HornResp parameters

The predicted performance is as follows:

POC3.1 - Hornresp performance

Results:
The upgrade was a success, and the TH is now capable of being powered to a higher level before audible distortion sets in.  Pictured below is a linearity test that I performed on the TH recently, with levels all the way up to 40V (HornResp predicted that the driver would exceed Xmax in the passband with 33.5V input). Note that the compression visible on the 40V graph actually might be primarily due to the mic being overloaded. At lower levels there is virtually no difference at all between the response at different voltage levels, which is likely why I think it has an "effortless bass" sound

POC3.1 TH - linearity test

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Brian Steele
17 August 2017