warpie said:Thanks Ian,
Can you please explain a bit further the "the poles so they are no longer coincident." part?
Do you mean that the cutoff frequencies will be close but not identical? And what would be the result? Maybe not 12dB/oct but 10dB/oct for example? Any other drawbacks?
thanks again!
warpie said:Thank you Ian, one last basic question if you don't mind The Fc on a 2nd order filter is still -3dB, isn't it? I mean, it's not -6dB...
ruffrecords said:Good question. If the poles are coincident then at Fc the response will be 6dB down. However, I suspect a lot of people will spec the filter at the -3dB point.
Cheers
Ian
warpie said:You lost me there. Are you saying that although the filter might be 2nd or even 3rd order, a manufacturer will spec the Fc at -3dB?
On a 1073 for example, does the HPF frequencies on the faceplate represent the -3dB or the -6dB points? (I realise that the 1073 is an LC HPF).
warpie said:I see, you are right. It just seems to be a bit odd to spec at -3dB no matter what but it's definitely the case, at least on this example.
Thanks Ian!
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