ES-600 Bi-Radial Wood Horn

Sale price Price $2,540.00 Regular price

Custom Built-to-Order Wood Horn 

  • ES (Exponential Spiral) flare geometry 
  • Price is 'Per Pair' in Canadian Funds 
  • Wrap-around horn mouth 
  • Precision CNC cut 
  • Baltic Birch layered plywood 
  • Sanded and finish stained 
  • Crossover Design service available (Please contact)
  • Bass Cabinet and Mannequin not included 

Drawing click here


  • Frequency Response 600Hz - 20kHz 
  • 417mm Wide x 203mm High x 198mm Deep 
  • 1.4” Throat 

Frequency Response 

The frequency response shown above is with the RCF ND-940 compression driver without the optional wood rear cover. 

Horizontal Off-Axis Colored Polar Map 



  • Suitable drivers
  1.  RCF ND-650, ND-940
  2. Radian 745DPB, 745PB, or 745Neo
  3. TAD TD-4003
  4. B£C DE780TN 


Customer Reviews
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ES 600 & ONKEN Style Cabs

Mid this year 2019, I built my first SET amp. It was months in the making and lots of patience and hard work. I was very happy with the results. Being it a 300B based SET amp at 8wpc, I needed a sensitive set of speakers to go with them. CUSTOM design was in my mind already having good experience amd satisfaction in making my amp. This is where I saw Joseph on one of his Youtube Videos. I was very happy to know that he was not that far from me. We emailed him back and forth until we reached the design that I wanted. Amazing skill, both on technical skills and hands. A lot of pateience too with the changes that came along the way. This was my first Custom speaker and it is the best speakers I ever had. I have tried countless of speakers in my system. I even have a friend who came by who has a 40K speaker told me he likes mine better. I decided to use his ES 600 on top of the Onken Cabinets. Im using all RCF drivers on this build. Joseph designed the crossovers too. I am so so so happy of the outcome. No listening fatigue. Clarity and resolution is top notch. Now im enjoying these beauties. In my opinion these speakers would well competein quality with the top high end commercial offerings out there which cost way way more. And by the way, most of all, he is a very good guy to deal with. Fair, patient and willing to do extra mile to get things right and make you happy and satisfied.