Manufacturers Info
Brand: JBL/Selenium
Model: HC23-25
Style: Exponential
Coverage (H x V): 100 x 40
Minimum Frequency: 600Hz
Throat: 1"
Mounting Type: 1-3/8"-18 TPI
Dimensions: 10" W x 5" H x 5.7" D
Embedded Files
Additional Notes:
Thanks to jvphotog for sending me this horn to test.
Diffraction style horn which uses a slotted grill in the middle of the throat to widen coverage.
Measurements:
Measurements:
Test Notes: Off axis and polars measured using a Celestion CDX1-1731 compression driver.
Mic distance 1m, measurements gated at 4.5ms and are smoothed at 1/48 Octave.
Horizontal:
Vertical:
Raw horizontal off axis response
Raw vertical off axis response
Horizontal off axis response - normalized to on axis
Vertical response - normalized to on axis
Horizontal Polar Response - Normalized to On Axis
-6dB Coverage Angle Highlighted
Vertical Polar Response - Normalized to On Axis
-6dB Coverage Angle Highlighted
Notes:
The diffraction grill design introduces a bunch of reflections in the throat which makes a real mess of the frequency response. The average coverage might be roughly 100 x 40 but it varies wildly with frequency. Not a great horn unless you need wide horizontal coverage with decent low frequency loading and don't mind the overall hash in the frequency response. The JBL 338800-001 or clones (like the Dayton H6512) might be a better choice as my testing shows that style horn does have roughly 100 degree horizontal coverage and is a much better design overall.
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