Speaker Plans for ES-300 Front Horn

Sale price Price $15.00 Regular price


Special Note (August 7, 2019): Added the following Files.  Previous customers will automatically get a download link with the new zipped filed.

  • 1059-ES-300-07.iges 3D Math File ---  Support Stand which raises the horn to accommodate a High Frequency horn below it.  (see Picture)
  • ES-300.iges 3D Math File -- This file is the entire ES-300 Horn 3D Math File to help support those that are machining the horn on a CNC machine.   For G-Code please email Joseph_crowe@josephcrowe.com 
  • All the other files contained in the zipped folder are unchanged. 


The ES-300 Front horn is a unique horn design offered by Joseph Crowe for the DIY Audio Hobbyist.  This horn utilizes the affordable and popular Fostex FE126En fullrange driver.  This horn is perfectly suited to front horn loading because of it's low QTS and high sensitivity. The horn provides good loading down to 300Hz and provides excellent extension up to 15 kHz.  The coverage pattern is relatively wide at 50 degrees even at 15kHz.  A passive crossover schematic is also included in the plans to further flatten the response and provide the high pass filter.  The unique Exponential Spiral (ES) horn flare features a complete wrap-around horn mouth which virtually eliminates edge diffraction.  The horn throat features an unusually wide angle of 40 degrees to also eliminate nasty throat resonances that has given horns the stigma of sounding "honky".  


  • Drawing package to fully build the ES-300 Front Horn 
  • Scale drawings which allow tracing the drawings onto the wood
  • Dxf files of all components for use in CNC cutting (optional) 

Purchase Process 

  • Click on 'Buy it Now'
  • Complete the Transaction 
  • You will receive an email link to download the zipped file containing all the files required to built the horn. 
  • Unzip and print the PDF drawings on 11x17 (Tabloid) size 
  • Use drawings to build the horns 

For questions please contact Joseph_Crowe@Josephcrowe.com 

Technical Details 


  • Constructed from various thicknesses of Baltic Birch Plywood 
  • Horn itself constructed of bent 3mm thick plywood that's supported by 12mm thick support rib behind each petal
  • 3mm thick plywood horn pedal is bent using a special process and fixture which is included in the plans 


  • 300Hz - 15kHz Bandwidth 
  • 100dB Sensitivity 
  • Wide coverage (50 degrees @ 15kHz) (see coloured polar map) 

Video showing bending fixture:



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John N.
United Kingdom United Kingdom
A budget way into horn loudspeakers

Provided you have a workshop, some decent woodworking skills and the ability to work from a set of drawings, these plans provide you with a low budget route into the world of horn loudspeakers. There are no step by step instructions so you have to figure out the order of assembly yourself. It took me the best part of two weeks to complete these with quite a few hiccups on the way. The end result is a stunning looking loudspeaker with a lovely mid range which makes vocals sound really very real. I paired the horn with an existing woofer box and got a pretty smooth transition between the two. You will have to be prepared to figure out a suitable crossover which to some extent will depend on your woofer. You will also need a biggish room as these horns are two feet across! The plans are good value, but be prepared to put in quite a lot of work.