• Item: Stereo Loudspeakers  
  • Type: Horn loaded  
  • Posted: 2 February 2013  
  • Builder: DorinD  
  • Country: Romania  
  • Comments: 11  

3-Way Horn System

This combination of readily available and easy made items is the result of 5 years of iterations. The aim was getting best audio-reproduction realism in a dinning-room with reasonable cost. And time is pretty cheap for an DIY amateur.

A pair of 70Hz down-scaled "Show Horns" by Bruce Edgar were combined with 90x40 trumpets. Digital processing was used to cope with acoustic path mismatch, crossover duty and room-correction. Class-D power modules were preferred while output autoformers adapt professional equipment range to home usage.

Multiple 6th-order subwoofers were deployed after Earl Geddes method. Tactile transducers were provisioned under the coach for greater impact on movies and music (piano, percussion).


  • YNWaN
  • 31 March 2013 at 06:19AM
  • Very 'funky' and cool looking - would love to hear them.
  • Ray
  • 25 May 2013 at 08:38PM
  • I was admiring your system the other day. It looks real good! Nice workmanship!I'm sure it sounds good too!
  • DorinD
  • 29 May 2013 at 05:25AM
  • Thank you both for the kind words!

    If I would ever have a bigger room, my system will look most like your uncompromised system.
  • DorinD
  • 23 June 2015 at 08:55AM
  • I have changed all Behringer processing to an all-in-one DIY solution based on miniDSP and APart stuff.
  • paschima
  • 1 July 2015 at 08:50AM
  • Nice work! Did you use EVM12L like Bruce Edgar? Think about same project from 80 Hz, but too slowly learn HORNresp for re-sizing original 50 Hz box :)
  • DorinD
  • 2 July 2015 at 06:35AM
  • Thank you. I didn't use Hornresp but I reduced all liniar dimensions by 1.4 to convert "Showhorn" to 70Hz. Consequently, I am using an 10 inch driver instead of the original EVM12L. I don't remember the code, but it's an Selenium with 2xFr/Qes more than 500Hz.
    You can use any 10inch driver looking for not too low Fr (about 60-70Hz) and high Bl. Good luck!
  • DorinD
  • 21 December 2015 at 05:18AM
  • -update-
    I begin using FIR filters (LR48dB/8) for the Mid and Hi ways (Bass and sub-Bass remain on IIR LR47dB/8). Both listening and measurement confirm the improvement which I describe as more clarity in dialogs --no need to increase volume to understand it-- and smoothness of the high spectrum.
    Also, I have tryed FIR of greater orders (96dB/8, 192dB/8, 384dB/8) but highs became more and more aggressive.
  • DorinD
  • 17 January 2020 at 01:05PM
  • -update-
    New strait midbass horns that improve balance on cellos and low voices. These new horns are ready-made outdoor speakers by Audac but the low-end horns are just perfect for my use.
  • hallcon83
  • 24 January 2020 at 01:19AM
  • Hello, I love your horn system, amazing work, and great looks! Can you tell us what you are using for your speaker drivers and which horns you are using?
    Best Regards,
  • DorinD
  • 27 January 2020 at 12:33PM
  • Thank you Dean! For Mids I use Selenium D405 on HL47-50R horns, Eminence APT 150 as tweeters and Audac HS212 for midbass. Crossover frequencies are 100/500/5k.
  • DorinD
  • 27 January 2020 at 12:42PM
  • ...sorry, Selenium D405 in Hm4750 horn...

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