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Joseph Crowe

No.1861 — Biradial for RAAL Lazy Boy 210-10 Flat Foil

Regular price $1.00 USD
Regular price Sale price $1.00 USD
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This is a custom product. Please contact for pricing and lead time.

Horn No.1861 is a custom horn designed to work with the RAAL 210-10 pure ribbon tweeter.  We've worked with RAAL to ensure exact physical fitment. The 1861 Horn is built to order and can be customized for other ribbon type tweeters including planar.  We can also supply the drivers and do crossover design for an extra charge.  

Click HERE for technical drawing. 


  • Price is for one pair of horns 
  • Solid Walnut Hardwood 
  • Mounts to existing bass cabinet (baffle mount design)
  • Secured to cabinet from inside (wood screws into the backside of the horn) 
  • Plastic throat adapter to ensure smooth horn flare transition 
  • 1.2kHz Fc 
  • Precision CNC machined and stained  
  • Pictures shown for reference from previous project 

    Acoustical Measurements 

    The below measurement is a comparison between the 1155 Horn (Green) and the driver mounted to a regular speaker baffle (Red).  

    Off-Axis Performance 

    The 1155 horn drastically improves the off-axis performance providing much wider coverage in the upper treble and also controlling the coverage in the midrange so that it matches the power response into the room.  This drastically improves the natural sound of instruments giving them better musical timbrel accuracy.  Edge diffraction is completely eliminated with the 1155 horn which improves transient detail.  

    How it’s made video click here.