![]() Thus the power to the woofer decreases at filtered fequencies, which reduces the excursion and risk of damage. It has a roll off "slope" where whatever frequency its set to will be attenuated, and the attenuation effect increases as the frequencies get lower. ![]() So that way, if there's music below the ports frequency, it gets filtered out protecting your woofer.Īlways remember the subsonic filter is NOT a cut-off. In other words, you set your sub-sonic to 34 hz. Whats half an octave you say ? Lets do some maths ! One octave up is double the frequency, One octave down is half the frequency. So for safety, we set the subsonic to 1/2 an octave below our tuned frequency. The enclosure can also play below that frequency, but only half an octave, before the cone starts over-excurting and there's potential for damage. In a ported box: You tune the port to a certain frequency, the enclosure is then capable of playing all frequencies above that tuning without an issue. For a sealed enclosure you adjust the subsonic filter to 25-35 Hz, to filter the extremely low bass frequencies your woofers unable to play. So for safety, we want to cut those frequencies out. Subsonic frequencies potentially damage your subwoofer because they make it expend a lot of energy, travel right to the limits of its excursion and play below the enclosures tuning. A sealed box is tuned by enclosure volume, larger enclosures tune lower, smaller enclosures tune higher. Then use that port tun number to set the subsonic. There are vids that show you how to figure it out. In a sealed box: The lower the frequency, the more excursion your subwoofer exhibits in order to play it loudly and accurately. You need to be setting the sub sonic based on the port tune of the enclosure. From my experience deck to amp with slopes added and tuning freq set accordingly can get you sounding real real clean. I asked the deck to find out if the pre is necessary. If you still work same place and want me take a listen I can swing by a day as is right up the road. Rule is ssf about 5hz below box tuning freq BTW, so stick to it. ![]() I'll need your idea of lows to know where you crossing. I asked type of car and tuning to recommend a center freq and possibly lpf to start with. Has a nice thump, nice rumble, no gaps, sounds very clean and can play anything.įirst two bands on the deck boosted a bit to increase low freq response. Tweeters crossed at 6.5khz, same slope, one have inverted phase I think. Inverted phase, midbass extension well into 60hz so no gaps. Mids high passed at 63hz and band passed at 4khz, -12db slopes. System 1 has sub low passed at 63hz -12db slope, phase inverted, box slightly bigger than manufacturer recommendation to increase low freq extension but at the expense of power handling. But my next system have a low pass of 31.5hz on the sub.
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