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RE: 100Hz Vs. 140Hz horn

Posted by Don Reid (A) on September 6, 2009 at 09:53:42

In Reply to: 100Hz Vs. 140Hz horn posted by j_s on September 3, 2009 at 01:23:01:

When considering the nominal cutoff frequency best for integrating woofers or subs into a system without degradation of mids and highs one is only working with half the equation. The other equally important consideration is the slope of the crossover.

I use a DEQX HDP-3 preamp-processor to digitally handle crossovers, time phase and room correction and EQ. A pair of Bill Fitzaurice designed HT-Tuba subwoofers (18 cubic Ft. folded corner horns with 15" drivers) up to a nominal 160Hz crossed over to Oris 150 horns driven by AER MD-3s crossed over to Fostex T500a horn tweeters at 7,000 Hz.

Normally the 160 Hz crossover would be unacceptable for the HT Tuba subs because of degradation to the midrange. I avoid this problem by making the slope of the 160 Hz crossover 96 dB/octave. The level of the subs at 320 Hz is substantially lower (about 24dB lower) with the 160Hz 96dB/octave crossover than would be the case with a more typical 40Hz 24dB/octave crossover.

The combination of horns, drivers and DEQX presents a very seamless, coherent and extended, fully horn loaded sound. They sound great. After nearly forty years of buying designing and building various soeakers I am at a point where I don’t know how I could do better.



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