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The CH-3 horn is often seen in Peavey’s loudspeakers. She is a 90° x 40° Constant Directivity Horn (CD) measuring 14.25″ (L) x 4.75″ (H). Unlike the newer flimsy ABS plastic types, she is made of sterner stuff of days gone by. Her flange is 1/4″ thick, strong enough to support heavier compression drivers like the Selenium D220Ti or even the Eminence PSD2002.
Fig 1 is the RAW response of the RX14 screwed to the back of the CH-3. This horn needs to be equalized in use otherwise she’ll end up sounding “honky”. The constant directivity feature of the horn is clearly visible in the way the horn is rolled-off. The lowest crossover frequency is at about 2.5kHz. The RX14 can easily handle this frequency without difficulty.
The Impedance of the RX14 with the CH-3 is in Fig 2. There is a slight impedance peak at 1.5kHz, indicating a conjugate network may not be necessary to flatten the impedance at her resonant frequency.
Summary Ideally, the CH-3 should be paired with a 12″ woofer. Most 15″ do not have the bandwidth to reach 2.5kHz without suffering from severe cone breakup. Below are some of Peavey’s loudspeakers using their CH-3 horn.
Unless otherwise stated, all measurements were made in Full Space (4 pi) with the mic at 36 ins, tweeter axis. Impulse Window=5ms. No smoothing applied. |
November 10, 2024Drivers Evaluation, PRO DRIVERS
Fig 1 – Peavey CH-3 with Peavey RX14 • RAW Frequency Response
Fig 2 – Peavey CH-3 with RX14 Impedance