ka7niq Posted July 2, 2010 Share Posted July 2, 2010 I have had some success in the past voicing speakers for my room and my tastes by slightly altering the values of the stock crossover capacitors. In many Klipsch Heritage speakers, I have been reluctant to do this, because of the cut off of the horns. Dynamic drivers can usually be made to cover a little more frequency spread. My Electro Voice Sentry III's use the SM 120 Horn and 1843 driver, I think that is the number. They are crossed from the 15 inch woofers at 600 and 3500 to the E/V ST 350 tweeter in the E/V Sentry 3's. However, in the Sentry IV's, using this same horn and driver, they are crossed at 400 hz! This indicates to me this horn/driver combo can play down lower, so I am going to try it. The SM 120 and the 1843 driver will play well above 3500 hz, yet that is where it crosses over to the ST 350 tweeter. Why ? Why not let it play above 3500, since it can, and see how it sounds in my room ? All it will take is altering the capacitor values a bit, and see how it sounds ? The SM 120 is a CD horn, and is said to require some equalization? I am not familiar with CD Horns and the EQ they require. Is it the high frequencies that require EQ once you go up past a certain frequency ? If so, perhaps that is why EV stopped at 3500 when they have a combo that can play well above that ? Anyone have any thoughts on what I am contemplating ? Quote Link to comment Share on other sites More sharing options...
Elso Kwak Posted July 3, 2010 Share Posted July 3, 2010 It's probably the EV 1823M driver. It can't go lower than 400Hz. Quote Link to comment Share on other sites More sharing options...
ka7niq Posted July 3, 2010 Author Share Posted July 3, 2010 It's probably the EV 1823M driver. I can't go lower than 400Hz. Yes, it is the 1823M, I thought it goes from 200 to 8000 ? Quote Link to comment Share on other sites More sharing options...
djk Posted July 3, 2010 Share Posted July 3, 2010 10dB down points. 1823 on SM120 needs boost to make it to 4Khz. Quote Link to comment Share on other sites More sharing options...
ka7niq Posted July 4, 2010 Author Share Posted July 4, 2010 10dB down points. 1823 on SM120 needs boost to make it to 4Khz. That is probably why EV crossed it over at 3500 in the Sentry III's then ? There seems to be 2 1823's ? One for PA use, and one for music use, with wider bandwidth ? Quote Link to comment Share on other sites More sharing options...
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