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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

lpf and hpf setting.
lpf and hpf setting.
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Old 23rd July 2012, 06:44 PM   #1
olsound is offline olsound
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Default lpf and hpf setting.

Can someone explain now to use and set lpf and hpf on a crossover.
Thanks
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Old 23rd July 2012, 06:53 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Low pass filers, as its name says, is to pass low frequencies to the woofer. High pass, inversely, pass high freq. to the tweeter. Finally, a band pass filter is made for a band limited freq response normally for squakers.
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Old 23rd July 2012, 07:08 PM   #3
olsound is offline olsound
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Can someone explain how to setup bass frequency with lpf and hpf.. 35hz to 90hz. This is the part I don't understand.
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Last edited by olsound; 23rd July 2012 at 07:18 PM.
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Old 23rd July 2012, 07:26 PM   #4
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Passive or active? There are some online calculators in the web. Google for them. Use Butterworth type.
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Old 23rd July 2012, 07:29 PM   #5
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by olsound View Post
Can someone explain how to setup bass frequency with lpf and hpf.. 35hz to 90hz. This is the part I don't understand.
It all depends on what you want to do. Do you have a passive or active crossover, how many ways, what's the freq range of the individual drivers?
You need to know that to be able to select the correct xover freq and the filter slopes.

jan didden
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Old 23rd July 2012, 07:32 PM   #6
olsound is offline olsound
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I am using a active crossover. 4 way

Bass 35hz to 90hz , midbass 80hz to 250hz, midhighs 200hz to 1.5 khz and highs 1.5khz to 20000khz.
Thanks
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Last edited by olsound; 23rd July 2012 at 07:55 PM.
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Old 23rd July 2012, 07:56 PM   #7
jan.didden is offline jan.didden  Europe
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So? What are the freq ranges of the various drivers?
If you don't know, you really should make an effort to find out.
You CAN do it by ear, but it's tedious and not guranteed you find the best solution.
Is there ANYTHING you know about the drivers?
In the trial and errror case, I would start with a 80Hz, 2000Hz, and 10kHz xover frequencies.

jan
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Old 24th July 2012, 10:05 AM   #8
olsound is offline olsound
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Jannneman I just want to know if this Is the rightway To set hpf lpf for a sub.

Eg. hpf@35hz and lpf@ 80hz or lpf@35hz and hpf@80hz.

And if the same thing goes for the other freq range
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Old 24th July 2012, 11:23 AM   #9
jan.didden is offline jan.didden  Europe
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I understand, but I'm sure you understand that this wholly depends on what the various drivers can handle. If you have a midrange that drops below 200Hz it would be pretty silly to set the hipass at 80Hz.
If you don't have that info, maybe you should just literally play it by ear.

Edit: you mean that you need to know how a hpf or a lpf works? It's all in the name.
If your midrange can handle say 100Hz to 3kHz, you set a hpf at 100Hz, that wil 'pass' all signals above (higher than) 100Hz to the midrange.
You then set a lpf at 3kHz which will 'pass' anything below 3kHz to the midrange but progressively cut of signal above 3kHz. Does that answer it?

jan
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Last edited by jan.didden; 24th July 2012 at 11:26 AM.
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Old 24th July 2012, 11:24 AM   #10
DF96 is offline DF96  England
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As Jan told you, the crossover has to match the drivers (and, to some extent, the enclosure too). There isn't a magic right answer. Speaker design is always a matter of compromise. For a subwoofer you need to know something about the sub and the main speaker too, because your crossover settings will interact with their native response. It might have helped if you had made it clear from the beginning that you are talking about a sub, not a main speaker.
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