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X1 Highpass Filter |
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matttcattt 
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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 Posted: 29 September 2004 at 4:58pm |
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How would I go about mesuring the delays?
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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Rog
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Rogers Archive Posts Joined: 23 March 2010 Status: Offline Points: 2166 |
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Posted: 29 September 2004 at 5:13pm |
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I use a anayliser that plots the GD. You can also do it with Smaart. Put in a tone and then click on the calculate distance button. This then gives you how far and hence the time it is from you. |
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matttcattt
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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Posted: 01 October 2004 at 5:55pm |
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"GD"? Wow, that Smaart is expensive software. Is it worth it? |
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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Dom
Old Croc 
Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
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Posted: 01 October 2004 at 7:00pm |
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You can download the trial and use it for 30 days and decide yourself if it's worth it... And if it takes you longer than 30 days to measure your delays then you've got problems... |
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 03 October 2004 at 12:46am |
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Or a really bad BP6 or higher.... :) |
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matttcattt
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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Posted: 04 October 2004 at 7:47pm |
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LOL. So I need to build the speakers first, design filters later? Ok. Thanks for the advice.
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 05 October 2004 at 5:46am |
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It would be a good idea to consider 'filtering options' BEFORE you get your hands dirty.... Just think about the speakers you're going to use. If it's a 15" and a small 1" HF you know for example that you need to crossover the 1" very high (2kHz and above) and that the 15" won't play good that high.... so you know this wouldn't be a good box. Or you want to build a 15" 3way cab. So you get an 8" for the midrange, now you have to check what's the lowest frequency the 8" can play well. I don't mean that you should have the crossover ready before the speaker. I just think that you should know what you want first.... |
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matttcattt
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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Posted: 05 October 2004 at 9:30pm |
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But the X15 is a 2 way design... A 15" will go up to 2k wont it? I realise that I need to plan. |
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 08 October 2004 at 3:10pm |
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I don't think that a 15" speaker should go higher than 1200Hz. Even that is in many cases too much if you want clear mids. It's plain physics. A cone with voice coil has a certain weight. This weight will act like any accelerated mass. The bigger the cone and the VC, the higher the mass. And the higher the frequency, the higher the acceleration. So high frequencies AND big cone add up to 'not that good at all'. It is NOT about 'mids are weak in SPL' or 'the freq plot isn't flat', it's more a question of details in sound. |
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matttcattt
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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Posted: 09 October 2004 at 10:46am |
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I understand the problem, and I agree, a three way design, or smaller bass driver would be better, but would Rog design a speaker that wouldnt work well? |
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 09 October 2004 at 2:32pm |
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I think the HF driver has a highpass at 2kHz, but the 15" somewhere around 1100 or 1200Hz or such. This is because the HF driver has a big hump around 2kHz and below and the acoustic crossover frequency is much lower than 2kHz. |
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matttcattt
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Joined: 21 April 2004 Location: United Kingdom Status: Offline Points: 106 |
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Posted: 10 October 2004 at 8:49pm |
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Oh. If the crossover frequencies are set for the designs im using, i dont have to do much planning really. |
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If it aint broke, don't fix it.
(and my own bit) If it is broke, fix it. (and more) If you can't fix it, take it apart and see how it "worked". |
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Dom wrote: