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Old 31st August 2009, 09:17 AM   #1981
pos is offline pos  Europe
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I found it (took me all that time...)

http://www.diyaudio.com/forums/showt...684#post726684

210dB/oct initial slope!
I cannot find the post with the exact ratio of each filter and eq though.
I keep searching!

Last edited by pos; 31st August 2009 at 09:26 AM.
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Old 31st August 2009, 11:03 AM   #1982
AndrewT is offline AndrewT  Scotland
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the DCX is limited to a max of 48dB/octave (in the spec).
The DEQ can go much steeper.
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Old 31st August 2009, 12:54 PM   #1983
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Andrew, The trick can be used with either unit. The "trick" is to hug a PEQ or notch filter right next to the crossover filter. The extreme steepness is only within the first octave or so.
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Old 31st August 2009, 01:22 PM   #1984
Pano is offline Pano  United States
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Interesting...... what would be the use of such a steep slope?
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Old 31st August 2009, 02:00 PM   #1985
pos is offline pos  Europe
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I want to use it for a 10khz crossover to a UHF ring radiator.
At these frequency you always have comb filtering, and trying to time aligne is pointless, because the wave lengths are so small.

according to Greg Timbers, about the design of the JBL S98000 :
Quote:
The comb filter effect is normal and cannot be eliminated, even with the use of electronic delay. The wavelength at 10k is an inch or less and even if the 045be were delayed to the z plane of the 435Be, even the slightest movement up, down, left or right of the measurement position would change the relative path length between the 435Be and 045Be to where the interference pattern would return.
so the steeper the slope, the smaller the comb filtering.

I contacted member sfogg to know the precise filter/eq ajustements he used.

Last edited by pos; 31st August 2009 at 02:05 PM.
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Old 31st August 2009, 02:59 PM   #1986
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by WithTarragon View Post
Andrew, The trick can be used with either unit. The "trick" is to hug a PEQ or notch filter right next to the crossover filter. The extreme steepness is only within the first octave or so.
does measuring confirm that the extra steepness is achievable in practice?
I would not be surprised to find that the specification does not confirm you can achieve what the "trick" looks like it might do.
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Old 31st August 2009, 03:18 PM   #1987
pos is offline pos  Europe
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measurements of the outputs of the DCX can be found in the link I posted above

Click the image to open in full size.
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Old 31st August 2009, 03:28 PM   #1988
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by WithTarragon View Post
The extreme steepness is only within the first octave or so.
that frequency response plot shows the extra steepness is available only within the first one sixth of an octave (~100Hz for a 600Hz roll off).

But, it's nice to know that the DCX does not have an inherent 48dB/octave steepness limit and that cascading filters can indeed allow each to perform as expected.
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Old 31st August 2009, 05:12 PM   #1989
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Default noise and click

I have not used my dcx for a long time. Now I notice that my dcx produces a loud plop when I switch it of. Is this normal? I thought it had a mute circuit to avoid this.
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Old 3rd September 2009, 08:15 PM   #1990
Liliya is offline Liliya  Norway
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Default Digital input/clock unit for DCX

Go to Swap Map and see my offer.

Eivind Stillingen, Norway
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