High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place.

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700Hz

Posted by RCA-fan (M) on August 5, 2007 at 08:40:41

In Reply to: good XO freq. posted by Jacobusje on August 5, 2007 at 02:55:27:

There are a few considerations when choosing a crossover point.

1: Directivity-- For a 12" woofer 1200Hz-- 15" woofer- 700Hz
2: Distortion--- A 1" driver distorts sooner than a 2" driver.
Best fit is 1" 1.5kHz to 2kHz--- 2" driver 700Hz and above.
Note this parameter is also power dependent. You can crossover a 1" driver at 500Hz as long as you do not exceed 1w/1m.
Note also that this means total program power. About 30% of lets say 10 watts, what hits the HF driver is 3watts.
This is 106dB 1w/1m ( 10 watts) if the system is 100dB 1w/1m ..pretty loud.

The fabulous RCA LC9 crosses over at 500Hz--sounds terrific, with a JBL 2410/D175 driver ( 12 dB per octave). The radial horn with it's 20 degree x 90 degree dispersion is why this is possible.

PS the Altec 802 has an underhung voice coil. The JBL D175 voice coil is .125" longer-meaning better power handling at 500Hz. ( same size as .250” gap)
You must have at least 12-18dB per octave network to protect driver. 6db is OUT!

Hope this helps, Bill

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