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Crossovers - 6dB A vs B?

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vectorwarrior
KVRian
 
655 posts since 23 Sep, 2006, from Vancouver, Canada

Postby vectorwarrior; Wed Sep 13, 2017 8:59 am Crossovers - 6dB A vs B?

The new 6dB slope crossovers in the beta... what's the difference between A and B?

I've gone through the help and there's no clarity as to what they represent... any ideas?
2 i7 machines (work & home) on Windows 10 ___ 32Gb and 16Gb Ram ___ Reaper & Audition ___ RME Babyface Pro & TC Electronic Studio Konnekt 48 interfaces
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vectorwarrior
KVRian
 
655 posts since 23 Sep, 2006, from Vancouver, Canada

Postby vectorwarrior; Wed Sep 13, 2017 9:13 am Re: Crossovers - 6dB A vs B?

Looking at it in MXXX with a pink noise generator and multianalyzer, it seems to be related to how the high frequencies are handled.

A seems like A will cause a harsh drop around the nyquist (much like all melda filters). In the below, from a 48khz session, note the harsher drop off on the far right
A 48kz.jpg


This can be resolved by using oversampling, in this case 2x. Note the far right now doesn't drop off as harshly:
A 96khz.jpg


B on the other hand, seems to resemble A at oversampled rates but with a slight 'shelf' like quality. Note the similarity between B and A oversampled in the right hand side:
B 48khz.jpg


I also tried B oversampled and it looks pretty similar to B.

So, the question is, why bother with A and B? Curious to know what Vojtech says.
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2 i7 machines (work & home) on Windows 10 ___ 32Gb and 16Gb Ram ___ Reaper & Audition ___ RME Babyface Pro & TC Electronic Studio Konnekt 48 interfaces
jmg8
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1239 posts since 8 Jul, 2015, from UK

Postby jmg8; Thu Sep 14, 2017 3:36 am Re: Crossovers - 6dB A vs B?

This shows the 2 crossovers on top of each other. Red is A and Green is B.
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jmg8
KVRian
 
1239 posts since 8 Jul, 2015, from UK

Postby jmg8; Thu Sep 14, 2017 4:02 am Re: Crossovers - 6dB A vs B?

As you can see in the previous picture the crossover is set exactly halfway (632.5hz) but as the 6db per octave is not steep the most interesting differences between A and B extend beyond the audible frequency range.

So in this second picture it shows two crossovers at the same time one at 20hz and one at 20,000hz. This now shows some more differences between the two. Same colours as before.
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jmg8
KVRian
 
1239 posts since 8 Jul, 2015, from UK

Postby jmg8; Thu Sep 14, 2017 4:28 am Re: Crossovers - 6dB A vs B?

And finally just if anyone was interested, I thought I'd show ALL the slopes at the same time!
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MeldaProduction
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9588 posts since 15 Mar, 2008, from Czech republic

Postby MeldaProduction; Thu Sep 14, 2017 4:29 am Re: Crossovers - 6dB A vs B?

Hehe so many colorful images! :D
Vojtech - MeldaProduction
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