16hz HPF - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 23 Old 11-01-13, 09:33 AM Thread Starter
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Re: 16hz HPF

Thank you, above said it should be a 1.2microfarad? (uf)
What resistor would I need and where on the line would I place it, across the positive and negative lines?

Thanks again

Craig
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post #12 of 23 Old 11-01-13, 09:46 AM
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You would need a 10Kohm resistor, placed across the positive and negative lines on the sub amplifier end.
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post #13 of 23 Old 11-01-13, 11:00 AM Thread Starter
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Re: 16hz HPF

Thank you, is it a ceramic or tin top capacitor I need?
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post #14 of 23 Old 11-01-13, 11:57 AM
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post #15 of 23 Old 11-01-13, 01:37 PM
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Re: 16hz HPF

Those bigs caps and resistors are overkill, and I believe you are confusing the op. For a hpf, all he needs in an inline cap, as in the drawing he posted. Where does the 10K ohm resistor come into the picture for a simple 1st order hpf? The cap value is calculated based on the input impedance of the amp he's using, which the op really should try to identify.

Remember, we are dealing with line-level inputs here. A small smd 50V cap will do the trick, maybe even 25V depending on his source. NOTE: I haven't calculated the cap value needed for a typical 47kohm input impedance amp, so I'm not sure if a value close to needed is even available in smd form.
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post #16 of 23 Old 11-01-13, 01:55 PM
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I would agree that those are way bigger than necessary. But I also don't think the op wants to get into soldering any smd components.

I also agree that the resistor is unnecessary, but since he isn't sure what the impedance is, going with the resistor will reduce the error.

If it was me, I'd do it your way. Or Fusseli's way. But for someone who doesn't really know what he's doing: the most recent suggested components will be just fine.
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post #17 of 23 Old 11-01-13, 04:15 PM
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Re: 16hz HPF

A .21 microfarad cap will work if the impedance is 47 kΩ.
However, not knowing the exact impedance it is easier to add the 10 kΩ resistor with the 1.2 uF cap to guarantee you get the desired results.

If you have ways of measuring it then I would suggest trying the .21 alone as per above.

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post #18 of 23 Old 11-01-13, 04:18 PM Thread Starter
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Re: 16hz HPF

Is this correct guys?

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post #19 of 23 Old 11-01-13, 04:47 PM
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That is correct IF (notice the big "if") your amp impedance is about 8-10Kohm. Since we don't know, you will need the resistor.

How about you tell us what amplifier you are using, and maybe we can figure out a simpler filter for you.
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post #20 of 23 Old 11-01-13, 05:02 PM Thread Starter
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Re: 16hz HPF

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Paulcet wrote: View Post
That is correct IF (notice the big "if") your amp impedance is about 8-10Kohm. Since we don't know, you will need the resistor.

How about you tell us what amplifier you are using, and maybe we can figure out a simpler filter for you.
Thank you.

I did give it a try and it didn't work correctly the freq drop was WAY high.

The amp is an onkyo nr1007 and the sub amp is actually a modified car amp to work on mains power using a PC psu

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