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Calibrating Subs with Behringer DCX2496

post #1 of 8
4/14/09 at 11:09am
Thread Starter 
Having built 2 - 18" driver Sonosubs and previously owning another 18" sub, all passive I would like to calibrate them properly. I ordered the DCX2496 yesterday and want to get prepared for when it arrives. I currently have an EP2500 to drive them and going to add another EP2500 in the near future.
This is all new to me on the calibration end of it. In reading alot of the threads regarding DB output and frequencies I was hoping someone would direct me to some good reading or step by step instructions on the whole calibration process. Any maybe some settings other people are using with the DCX2496 as a starting point.
I currently have the subs hooked up through my Onkyo SC885p Processor crossed at 80hz and there is more info coming through the subs then there should be. I am hoping the DCX2496 does the trick and lets only the deep bass through to clean up the sounds.
Any thoughts or info is really appreciated.
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post #2 of 8
4/14/09 at 11:12am
Quote:


I currently have the subs hooked up through my Onkyo SC885p Processor crossed at 80hz and there is more info coming through the subs then there should be.

What do you mean by this? If your 885 crossover is set too 80Hz for your speakers then all content below 80Hz will go to the subs...along with the LFE. Maybe you have some speakers not set to 80Hz, the 885 has crossover settings for each individual speaker set.

What did you want the DCX to do...it will do crossovers (but I do not think you need that), it will do lots of EQing too. This is what you will use. You should not use it to fix whatever problem you have in your crossover setup on the 885. It sounds like you really could have saved $200 and bought the Behringer 1124p for EQing purposes.

btw, I have the same pre/pro but its still in the box
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post #3 of 8
4/14/09 at 1:23pm
Thread Starter 
I have the speakers (mains, surrounds and center) set to THX which automatically sends all below 80hz to the sub. I really have been happy with the 885. For what I bought the DCX2496 for I can always sell it for a very minimal if any loss.
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post #4 of 8
4/14/09 at 1:49pm
Quote:
Originally Posted by Alan Winslow View Post

I have the speakers (mains, surrounds and center) set to THX which automatically sends all below 80hz to the sub. I really have been happy with the 885. For what I bought the DCX2496 for I can always sell it for a very minimal if any loss.

You can definitely sell it on here to many needing one recently but Im still confused on your setup.

THX as a setting is meaningless to me. Is it actually a hard set 80Hz? That makes little sense and not what THX actually intended but anyhow. Ignore it!

If you run Audyssey on your 885, you will notice that it sets all your speakers to the logical crossover point based on the measurements.

No matter what you are not going to be setting EXTRA crossovers with your DCX unless you want to run different subs for different LF ranges under the 885 crossover point. Example Ultra Low Frequency (ULF) runs 10Hz to 40Hz, midbass subs running 40Hz to 80Hz all connected to the DCX so that it can control those difference ranges.
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post #5 of 8
4/14/09 at 2:20pm
Thread Starter 
Quote:
Originally Posted by penngray View Post

No matter what you are not going to be setting EXTRA crossovers with your DCX unless you want to run different subs for different LF ranges under the 885 crossover point. Example Ultra Low Frequency (ULF) runs 10Hz to 40Hz, midbass subs running 40Hz to 80Hz all connected to the DCX so that it can control those difference ranges.

This is what I am going to experiment with and try to achieve. 1 sub for 80hz and down and the other 2 below 30hz possibly. I want to experiment. Where they are set now there is a little to much info coming through the subs I would like to eliminate.
I will play with the LFE settings tonight and experiment with it.
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post #6 of 8
4/14/09 at 3:20pm
I recently purchased a DCX2496 too.

I would honestly consider these the swiss army knife of sound processing as far as the number of duties it can perform.
  • Subsonic filter
  • Linkwitz/Transform [Shelf Filter]
  • Parametric EQ
  • Crossover (with an ultra steep curve 48db)

The best bet is to download the manual and more importantly the software that makes configuring the DCX2496 simple. Thats what really actually convinced me to buy it.
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post #7 of 8
4/15/09 at 3:16pm
So with regards to calibrating multiple subs with this unit, how does one:

1. Set the input gains
2. Determine the phase and delay for each sub
3. Determine the type of crossover and slope to use for different subs.

*Assuming you have REW and an SPL meter*
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post #8 of 8
4/15/09 at 8:30pm
When you're dealing with multiple subs which are different and are located in seperate locations, it's almost impossible to get it perfect. Way to many variables. And even if you got it perfect in one location, it would sound completely different in another seating position.

If you had a MBM and a SUB you could cross them over accordingly. But multiple subs. good luck :/

SUB - highpass @ 15hz / lowpass @ 50hz
MBM - highpass @ 50hz / lowpass @ 120hz
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