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Junior Varsity
Stage issues. Help!
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<blockquote data-quote="Bennett Prescott" data-source="post: 23599" data-attributes="member: 4"><p>Re: Stage issues. Help!</p><p></p><p>Indeed it will, Jonathan. This is because no crossover has infinite slope. You can demonstrate this by holding your hands flat so they touch at your fingers and form a V, your left hand is the low pass response of your subwoofers and your right hand is the high pass response of your mains. Where they connect is the acoustic crossover frequency. If you raise your left hand up (add gain) and imagine the response continuing to connect, you can see that the effective crossover point rises up your right hand. The way to compensate is to also move your left hand left (lower the crossover point in frequency) you can see how it is possible to get them to match up again.</p><p></p><p>This is standard practice, since most people like a fairly hot bass environment. The problem is that now the two crossover points are at different frequency, and they experience different phase shift (read: delay). This means you will have to delay your mains to get them to line up in time again. You can probably do this by ear, 1ms at a time. You will probably end up with 2-4 ms of delay, maybe 6, but if you find you want more you have probably gone too far.</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 23599, member: 4"] Re: Stage issues. Help! Indeed it will, Jonathan. This is because no crossover has infinite slope. You can demonstrate this by holding your hands flat so they touch at your fingers and form a V, your left hand is the low pass response of your subwoofers and your right hand is the high pass response of your mains. Where they connect is the acoustic crossover frequency. If you raise your left hand up (add gain) and imagine the response continuing to connect, you can see that the effective crossover point rises up your right hand. The way to compensate is to also move your left hand left (lower the crossover point in frequency) you can see how it is possible to get them to match up again. This is standard practice, since most people like a fairly hot bass environment. The problem is that now the two crossover points are at different frequency, and they experience different phase shift (read: delay). This means you will have to delay your mains to get them to line up in time again. You can probably do this by ear, 1ms at a time. You will probably end up with 2-4 ms of delay, maybe 6, but if you find you want more you have probably gone too far. [/QUOTE]
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