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2face View Drop Down
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    Posted: 03 August 2020 at 1:45pm
Hi All,

I've got a Behringer CX3400 crossover that I used to use for my 2-way system that i've now upgraded to a 3-way system and would like some help with crossover points, specifically with how to access these crossover points as the crossover is not digital, so need to use the parameters supplied as such.

The 3-way system (to make the post slightly more interesting maybe!) is 2Kw of dual 18" RCF on sub bass, 4x PD-loaded HD15's on kick bass and and a pair of Mackie's that i've reloaded with Turbosound and PD on mid-high duties (these mid-tops are internally crossed over). All powered by old school Matrix STR and QSC.

I need to specify 2x crossover points with 2x knobs (as below picture) giving 3x frequency bands. I want the sub bass to meet the kick bass at approx 60hz and so I have set knob 1 to this, I want the kick bass to meet the mid-tops at about 160hz, but knob number 2 only starts at 440hz -way too high for HD15.

Is there something i'm missing, or is it that this setup is just not possible on this crossover and a digital dsp or similar is required?

Got a little party this weekend and have been refurbing and upgrading the rig during lockdown. It was last used 10 years ago so i want to come back in style if at all possible. PS i'll add a rig-porn shot if anyone manages to solve my issue Tongue

Thanks!
Submission VS 2facedBass 21/11/09 @Basingstoke Bang Bar!
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odc04r View Drop Down
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Points: 5482 		Post Options Post Options   Thanks (1) Thanks(1)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2020 at 4:49pm
It's not possibly to go lower than 440Hz with the lower point of the upper range, you'll need a different unit. This is aimed at a more classical 'bass - mid - compression driver' split of bands. You'd have to lose the HDs and then bi-amp the mackies to use it realistically.

Do yourself a favour and just get a dcx or similar!
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munkey View Drop Down
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Originally posted by odc04r odc04r wrote:

It's not possibly to go lower than 440Hz with the lower point of the upper range, you'll need a different unit. This is aimed at a more classical 'bass - mid - compression driver' split of bands. You'd have to lose the HDs and then bi-amp the mackies to use it realistically.

Do yourself a favour and just get a dcx or similar!

+1

That x over you have is worse than terrible imo. 
the midtops!
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Originally posted by odc04r odc04r wrote:

It's not possibly to go lower than 440Hz with the lower point of the upper range, you'll need a different unit. This is aimed at a more classical 'bass - mid - compression driver' split of bands. You'd have to lose the HDs and then bi-amp the mackies to use it realistically.

Do yourself a favour and just get a dcx or similar!

Look at the photo again. Look at the numbers.I bet from it goes down to 44. 
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I think in 3 way mode if you read the manual you will find out that the mid/high crossover point cannot go lower than 440 and that's the question. The low/mid can, but that's not an issue. And you can have under it in 2 way mode too, but again that's not the issue!
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munkey View Drop Down
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Originally posted by KDW32 KDW32 wrote:

Originally posted by odc04r odc04r wrote:

It's not possibly to go lower than 440Hz with the lower point of the upper range, you'll need a different unit. This is aimed at a more classical 'bass - mid - compression driver' split of bands. You'd have to lose the HDs and then bi-amp the mackies to use it realistically.

Do yourself a favour and just get a dcx or similar!

Look at the photo again. Look at the numbers.I bet from it goes down 

If you set it to 60hz, your next point is 600hz. I had one of these many years ago. They're Bollox. If you have to use it. Plug subs in sub output, kicks in low and tops in high. The trouble is, there's no hpf other than the 25hz button. When using the sub out put and the low output, both will play from 25hz, upto they're x over point. Eg. Sub set at 70hz (will play 25 to 70). Low set to 120 ( will play 25 to 120). Playing your bins down to 25hz will cause problems. 
the midtops!
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Points: 300 		Post Options Post Options   Thanks (0) Thanks(0)   Quote munkey Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2020 at 9:53pm
That x over is the reason your drivers died in the 1st place imo
the midtops!
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abrupt View Drop Down
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Playing your bins down to 25hz will cause problems. 

not for me 
its all about infrabass
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have a read there is a way but dont know if its any good i had one of these years ago very limited u need a loud speaker management like dcx then u will have all the control u need Tongue
feel the vibes !!!   "Who Feels it Knows it"            Strong like Lion              
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odc04r View Drop Down
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Had one about 20 years ago also. Got rid for same reason. They were about half the price of a DCX back then too.

I am sure they can be internally modified to change responses, but what's the honest point. Bin it off and get a decent LMS with all the other joys they also offer.
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Thanks All.

I'm in no way trying to keep this xover at all costs, just a little surprised at it's lack of range now moving to the 3-way setup!

Managed to get a borrow on a DCX earlier today and about to get stuck in to some setup videos shortly. Will set the high pass at 30hz so the sub can hit some 33's if possible, hopefully without destroying any of those lovely tasty drivers -as I had enough of that the last time round Thumbs Up

(^ mind you most of these went when the STR2400 popped)
Submission VS 2facedBass 21/11/09 @Basingstoke Bang Bar!
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Originally posted by abrupt abrupt wrote:

Playing your bins down to 25hz will cause problems. 

not for me 
Big smile
the midtops!
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