Joseph Crowe
ES-600 Bi-Radial Wood Horn No.1978
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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".
Features
- 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)
- Built-in rear extension for optional super tweeter (top and bottom)
- Price is for a pair (select x1 at checkout)
- ES (Exponential Spiral) flare geometry
- Wrap-around horn mouth
- Precision CNC cut
- Solid kiln dried walnut construction
- Sanded and finish stained with x2 coats of Rubio hardwax
- Zero maintenance finish
- Repairable finish
Purchase 3D CAD Files for (DIY only)
- The latest 3D CAD file can be found here. (slightly older version 1965, will be updated to 1978 soon!)
- This horn is used in our 2154, 2155, and 1815 Turn-Key Build Plans
Click on the images below to enlarge:

Specification
- Frequency Response 600Hz - 20kHz
- 416mm Wide x 203mm High x 198mm Deep
- Standard mounting for 1.40" compression driver
- Can be adapted down to 1.00" using an adapter (special request)
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 (Using optional adapter)
- 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.















