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[Jim Schneider]

Hi,

The setup.
2 JBL SR712m Highs driven/w (Crown Macro 2400)
2 JBL SR4715 Mids driven/w (Crown Macro 3600)
1 Yorkville LS2100 powered sub Lows. (2400w)
DBX Driverack 260

The genre.
Dance music loud and thumpy

My question.
What would be a good starting point for crossovers?

Thanks in advance for any advice.

[Paul G. OBrien]

Dance music loud and thumpy
What would be a good starting point for crossovers?

80hz and 500hz should produce the results you want.

[Jay Barracato]

I don't understand. It sounds like you are using one full range box for one passband and a different full range box for another passband.

[Scott Carneval]

I don't understand. It sounds like you are using one full range box for one passband and a different full range box for another passband.

+1

And a single sub, 21" or not, isn't going to keep up with those 4 tops. 

[Tim Weaver]

The SR4715 is a dual 15 sub cabinet. This setup is fine I think.


I would shift the crossover points a little further down though. I'd probably run the 21" from 25 to around 60. Then the 4715 from 70-75 to 160-200 ish. Then the 712 from 200 and up.

The 4715 in this setup would be what the DJ's call a "kick bin". Being responsible for the bulk of the pumping kick drum. The 21 would handle the extreme low bass.

Although the Yorkville is loud for what it is, it will not keep up with the rest of your system so take it easy on it. Until you get 3 more of them, that is.....

[Bill Hornibrook]

I get what you're trying to do.

I'd probably start at around 120hz and 45hz BW24 (with the option or raising to about 50 if the Yorkville isn't working enough). I think it will keep up with the rest of the system if crossed over low enough.

FWIW I DJ EDM with double 21" subs that contain the same B&C driver as that Yorkville. There's considerable sub40hz content in contemporary dance music. When those drops hit it feels like the floor is going to collapse.

High pass your sub at around 28hz BW (LR is down 3dB at cutoff point and you don't want that).

Also FWIW I'm no sound expert or anything - just a guy out in the field. The pros may have other ideas.

Neat idea. Post follow-up please

Edit: This is all assuming that you're playing contemporary dance tracks. If it's a live band you'd better listen to what the live sound guys have to say.

[Jay Barracato]

The SR4715 is a dual 15 sub cabinet. This setup is fine I think.


I would shift the crossover points a little further down though. I'd probably run the 21" from 25 to around 60. Then the 4715 from 70-75 to 160-200 ish. Then the 712 from 200 and up.

The 4715 in this setup would be what the DJ's call a "kick bin". Being responsible for the bulk of the pumping kick drum. The 21 would handle the extreme low bass.

Although the Yorkville is loud for what it is, it will not keep up with the rest of your system so take it easy on it. Until you get 3 more of them, that is.....

I was thrown off by the reference to "mids".

[Jim Schneider]

Thanks everyone for the suggestions.

So far I tried Pauls 80hz and 500hz, and it has a nice FULL sound.
Except I went a little lower with 70hz and 400hz.
I saved as a preset to work on later.

I also tried a combination of Tim & Bills suggestions.
27.8hz BW24 - 59  Yorkville
59hz - 162hz  SR4715's
162hz - 17.5Khz  SR712m's
This gives me a little more thump and the Yorkville isn't working as hard.

Again Thank you all for the input.

[David Morison]

High pass your sub at around 28hz BW (LR is down 3dB at cutoff point and you don't want that).

Right idea, wrong number - LR is down 6dB at the nominal cutoff frequency, BW is down 3, so less of a loss. (Unless you just missed the word "more" after the "3dB"    )
Cheers,
David.

[Nick Enright]

Quote from: Bill Hornibrook on Yesterday at 11:10:24 am
High pass your sub at around 28hz BW (LR is down 3dB at cutoff point and you don't want that).

Right idea, wrong number - LR is down 6dB at the nominal cutoff frequency, BW is down 3, so less of a loss. (Unless you just missed the word "more" after the "3dB"    )
Cheers,
David.

I much prefer a 48db/octave HPF, with a bump at the port tuning, and a notch right below the HPF to get the slope even steeper. I'll normally alter the filter type depending on phase response in the local area.

[Tim McCulloch]

I much prefer a 48db/octave HPF, with a bump at the port tuning, and a notch right below the HPF to get the slope even steeper. I'll normally alter the filter type depending on phase response in the local area.

How much group delay do those filters create?

[Bill Hornibrook]

I much prefer a 48db/octave HPF, with a bump at the port tuning, and a notch right below the HPF to get the slope even steeper. I'll normally alter the filter type depending on phase response in the local area.

Sorry - my figures were what I have set up on my DRPA and I can't do 48dB on that unit. I do have a 3dB bump at 32hz though - my box tuning.

My LR slope figure was just plan ignorance though. Thanks for the correction - and I just learned something too

If you're playing tracks like "Down On Me", "Drop It Low", "Bottom's Up", "Rack City" etc. I would imagine my lower figures between the 21 and 15s would work best since stuff like this has significant sub 40hz content.

But if you're not - probably higher would give you the most thump.

BTW have you ever noticed how tracks about oral sex have the most sub40 content?

[Chris Carpenter]

How much group delay do those filters create?

36Hz arrives after the band has packed up and gone home.

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