ES-600 Bi-Radial Wood Horn No.1978

Sold as a pair in either finished or unfinished (requires sanding), select option at checkout.

Horn No.1978 represents a sweet spot in terms of size, providing extension down to 600Hz and yet still maintaining acceptably wide horizontal off-axis coverage in the upper treble. This allows the horn to be used successfully in 2-way application with low frequency drivers ranging from 8" to 15". The picture shown above is with a 10" driver.  The horn measures 416mm wide (16.40") which fits nicely with bass cabinets as small as 400mm wide. This latest version of the ES-600 Biradial has the following changes compared to when I originally introduced the horn four years ago. 

Changes

• Includes removable throat adapter for either 1" or 1.4" throat drivers
• Special 3D printed adapter is printed as a solid (no hollow fill)
• Remains dense and inert compared to regular 3D printing 
• Holds drivers weighing up to 20lbs. 
• Rubber isolation feet x3 (pocketed into bottom of horn) 
• Brushed copper circular decal logo 
• Throat bump to eliminate small resonance near the cutoff frequency (600Hz) 
• New tapered appearance 
• Built-in rear extension for super tweeter (top and bottom) 
• The original design 3D CAD file can be found here. 
• The latest 3D CAD file can be found here. (slightly older version 1965, will be updated to 1978 soon!)

Continuing from previous revision the also features:

• Price is for a pair 
• ES (Exponential Spiral) flare geometry 
• Wrap-around horn mouth 
• Precision CNC cut 
• Solid kiln dried walnut construction 
• Sanded and finish stained with Rubio Monocoat 
• Crossover Design service available (Please contact)

Click on the images below to enlarge:

Specification 

• Frequency Response 600Hz - 20kHz 
• 416mm Wide x 203mm High x 198mm Deep 
• 1" or 1.4" throat depending on configuration 

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 

Below is an example list of suitable drivers. Any driver with a 1.40" throat and 101mm bolt spacing will physically fit. 

• RCF ND650, ND850, ND950
• Radian 745DPB, 745PB, or 745Neo
• TAD TD-4003
• B£C DE780TN 

Suitable drivers 1.0" throat (76mm bolt spacing) 

• TAD TD-2001
• Older Pioneer and Altec drivers 
• Coral M100 
• B&C DE250
• RCF ND350 

Shipping 

All horns are shipped in 3/8" plywood crates fully lined with foam padding.