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Old 5th January 2006, 09:58 PM   #1
mikee55 is offline mikee55  United Kingdom
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Default Gain amp after xover Query

Hi all, can anyone point me in the right direction please. I want to build a subwoofer that handles all signals below 40hz.The circuit is actually for my cousin and his reqiurements mean having to use a crossover,probably with more than 24db of lowpass filter!I wired a xover at 40hz 24db Linkwitz Reily and he complained that he still heard bass! When I added another 12db he was satisfied that he could no longer hear bass,but he now lacks volume. Is it possible that after 36db of attenuation that the signal is too weak to drive his amps fully? He's using a pair of JBL 12" car sub woofers in a sealed box with 100 watts r.m.s. per driver. His music taste is underground Dance as in hardhouse,hardcore and watches a lot of DVDs. Should I add a gain stage after the xover to drive the amps? I don't have the means to measure the output so I need to know how much gain to apply,and thought I'd post before trying.A highpass filter is included to prevent freqencies below appx 7hz,from power compression in the drivers and to prevent the amps from amplifying low subsonics that might cause problems. Is this ok,it's basicaly a cap on the input?Should I use an active highpass,instead,or leave it as it is?

Thanks Y'all.mikee55
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