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Question DCX2496 For Dummies ( AVS Forum DIY Speakers and Subs )
Updated: 2010-07-23 12:05:59 (26)
DCX2496 For Dummies

Their are a lot of things I would like to do with my DCX but I always get stumped on how I should do it. I've read the manual, and played with the software but I'm still not sure how to come up with the numbers to input. I know with REW I should be able to come up with the numbers but I am unsure what to measure for them.

Could anyone take a second to explain a couple of things for me?

1. How do I figure out the numbers to set up a dynamic eq?
2. How do I figure out the numbers for a LT
3. Would it be possible (or advisable) to use the sum function to create a LFE+ Left Front and LFE +R Right Front and send that to a sub underneath each main?

Answers: DCX2496 For Dummies ( AVS Forum DIY Speakers and Subs )
DCX2496 For Dummies

We feed our DCX's into pro amps. Not sure why there would be an issue.

Mine is dead silent too.

mynym

DCX2496 For Dummies

Quote:
Originally Posted by mynym
We feed our DCX's into pro amps. Not sure why there would be an issue.

Mine is dead silent too.
How about tweeters? and lots of people feed DCXs into normal comercial amps for running full active mains.

Subs are not going to have issues.....this is not the discussion though. FWIW my subs have no hiss with a DCX connected to them....but that chain is pro audio stuff.

penngray

DCX2496 For Dummies

Quote:
Originally Posted by penngray
How about tweeters? and lots of people feed DCXs into normal comercial amps for running full active mains.

Subs are not going to have issues.....this is not the discussion though. FWIW my subs have no hiss with a DCX connected to them....but that chain is pro audio stuff.
Not sure many subs could do hiss if asked to.

But the key to using something like the DCX is to run full-strength signal in, and then to attenuate the outputs. Kinduva pain, but it's the right thing to do to maximize resolution and minimize noise.

tlag

DCX2496 For Dummies

Quote:
Originally Posted by catapult
I should've known you'd have all the toys Ricci. How do you like the MX882? Any hiss or other nasties?
For about $90 it's great. Works like it should and I haven't noticed an amount of noise or other junk presenting itself. I am mostly using these in a more PA/ live sound oriented set-up, with a mass amount of other gear linked together, than a critical listening home audio setting, so YMMV. Maybe I'll take one home and play with it a bit.

Ricci

DCX2496 For Dummies

mine has no hiss what so ever. wouldn't even know it was on.

Fabricator

DCX2496 For Dummies

i now have a DCX2496.

if my laptop has a serial port, can i just use a serial cable ?

Fabricator

DCX2496 For Dummies

Quote:
Originally Posted by TPnBobcats


OH MY GOD! THE POD PEOPLE HAVE GOTTEN PENNGRAY!!!
lmao!!

You already know I will spend thousands just to find out the turth and they have a 30 day money back garuntee.

Also the standard DCX does have a well known hiss to it when no sound is being played because it its output gain is HUGE, its meant for pro audio setups so when we use it in our homes with our commercial setups we are going to have a higher noise level.

I want to know if there is truely difference upgrading the inputs and outputs!

penngray

DCX2496 For Dummies

I should've known you'd have all the toys Ricci. How do you like the MX882? Any hiss or other nasties?

catapult

DCX2496 For Dummies

Quote:
Originally Posted by penngray
btw, Im about to pay to get one of my DCXs upgraded ($500 or so) for input/output/DAC upgrades. I will compare it to my other original DCXs to find out if the $500 is worth it.


OH MY GOD! THE POD PEOPLE HAVE GOTTEN PENNGRAY!!!

TPnBobcats

DCX2496 For Dummies

Quote:
Originally Posted by catapult
I think you'd need an external mixer to do anything with more than two channels. It could either be before or after the DCX depending on how you wanted to do things. Behringer makes a couple of small ones that would fit nicely in a rack.

http://www.parts-express.com/pe/show...umber=248-6306
http://www.parts-express.com/pe/show...number=248-622
I already have 2 of those MCX's in my rack with the DCX. I used them at the southern GTG to good effect.

Ricci

DCX2496 For Dummies

Quote:
Originally Posted by penngray

btw, Im about to pay to get one of my DCXs upgraded ($500 or so) for input/output/DAC upgrades. I will compare it to my other original DCXs to find out if the $500 is worth it.
Where are you having that done, penn?

Scott Simonian

DCX2496 For Dummies

Quote:
Could you not have the LFE in on channel C and sum A and C to one of the outputs while setting up another channel to output C summed with input B? I've never tried it, so I'm not sure.
I think you'd need an external mixer to do anything with more than two channels. It could either be before or after the DCX depending on how you wanted to do things. Behringer makes a couple of small ones that would fit nicely in a rack.

http://www.parts-express.com/pe/show...umber=248-6306
http://www.parts-express.com/pe/show...number=248-622

catapult

DCX2496 For Dummies

Quote:
Originally Posted by Scott Simonian
Where are you having that done, penn?
actually two options

Micheal Mardis
http://www.michaelmardis.com/dac/dacs.htm

Ric Schultz
http://tweakaudio.com/EVS-2/Behringer_DCX2496_mods.html

penngray

DCX2496 For Dummies

Quote:
Originally Posted by penngray
btw, Im about to pay to get one of my DCXs upgraded ($500 or so) for input/output/DAC upgrades. I will compare it to my other original DCXs to find out if the $500 is worth it.
Snake Oil

thylantyr

DCX2496 For Dummies

Quote:
Originally Posted by catapult
Dynamic EQ is a pretty advanced function and most people should just ignore it unless they really know what they're doing. It's an EQ that kicks in more as the sound gets louder. An example might be a highpass filter on a sub that isn't there at low volumes but protects the sub from overexcursion when the volume gets loud.

Don't sweat the numbers. Just measure the sub in the room and EQ it flat with shelving filters for the low end rolloff and band filters for the peaks. Room effects swamp the theoretical LT calcs.

Nope. The sum channel can only add two inputs -- L + LFE or R + LFE. It can't do both.
IMO the dynamic EQ is one of the most underutilized functions on the DCX. I'm guilty as well. I plan on using it on some sealed subs but haven't taken the time to set it up.

You can cheat a bit and sum a few inputs before they enter the DCX since they will be mono low bass anyway if you wanted to. Seems like he's talking about a Quasi stereo bass set-up though. It would have the bass from left and right still independent in 2 seperate subs but both would be getting the LFE. Seems like it should be able to do that. Could you not have the LFE in on channel C and sum A and C to one of the outputs while setting up another channel to output C summed with input B? I've never tried it, so I'm not sure.

Ricci

DCX2496 For Dummies

Quote:
Originally Posted by shepP
1. How do I figure out the numbers to set up a dynamic eq?
Dynamic EQ is a pretty advanced function and most people should just ignore it unless they really know what they're doing. It's an EQ that kicks in more as the sound gets louder. An example might be a highpass filter on a sub that isn't there at low volumes but protects the sub from overexcursion when the volume gets loud.

Quote:
2. How do I figure out the numbers for a LT
Don't sweat the numbers. Just measure the sub in the room and EQ it flat with shelving filters for the low end rolloff and band filters for the peaks. Room effects swamp the theoretical LT calcs.

Quote:
3. Would it be possible (or advisable) to use the sum function to create a LFE+ Left Front and LFE +R Right Front and send that to a sub underneath each main?
Nope. The sum channel can only add two inputs -- L + LFE or R + LFE. It can't do both.

catapult

DCX2496 For Dummies

Quote:
Originally Posted by stgdz
Is a BFD required for REW feedback though? I am pretty new to this and have glanced over the BFD guide on htshack but would I need to get both to use with the BFD guide, or does the DCX have the BFD features on it?
I do not do anything automated...REW will tell me the issues I want to address then I fix them manually. I also EQ to what I like the best, I little bump in the bass.

penngray

DCX2496 For Dummies

Quote:
Originally Posted by stgdz
Is a BFD required for REW feedback though? I am pretty new to this and have glanced over the BFD guide on htshack but would I need to get both to use with the BFD guide, or does the DCX have the BFD features on it?
You can do the same thing with the DCX plus a whole lot more. A BFD is not a requirement for using REW .

Rightbrained

DCX2496 For Dummies

Quote:
Originally Posted by mynym
It's more than just a BFD.
You can also link them and it can be controlled via a computer.
Is a BFD required for REW feedback though? I am pretty new to this and have glanced over the BFD guide on htshack but would I need to get both to use with the BFD guide, or does the DCX have the BFD features on it?

stgdz

DCX2496 For Dummies

Quote:
Originally Posted by shepP

1. How do I figure out the numbers to set up a dynamic eq?
Not sure what you are asking, although I have never used the DCX for dynamic EQing...I have audyssey for that.

Quote:
2. How do I figure out the numbers for a LT
There are a couple of posts somewhere explaining exactly how to do that, once again I have never done it with the DCX.

Quote:
3. Would it be possible (or advisable) to use the sum function to create a LFE+ Left Front and LFE +R Right Front and send that to a sub underneath each main?
You want to bypass what your AVR does with Bass Management?

penngray

DCX2496 For Dummies

Quote:
It's basically the best thing since sliced bread for a loudspeaker system.
Yes, it is....crossovers (48dB slopes so I can crossover my ribbon tweeter at 2K and have zero worries about distortion!!!!!), Delay settings......phase issues? Blah we do not have them, driver testing (muting each driver), comparing different crossovers is extremely easy.

btw, Im about to pay to get one of my DCXs upgraded ($500 or so) for input/output/DAC upgrades. I will compare it to my other original DCXs to find out if the $500 is worth it.

penngray

DCX2496 For Dummies

Quote:
Originally Posted by stgdz
Is the DCX basically the feedback destroyer with an equalizer? I seem to remember reading that it has FDB features in it.
It's more than just a BFD.

3 discrete inputs, 6 discrete outputs

Variable crossovers (highpass (subsonic)/lowpass) at different slopes and types
Can easily do linkwitz/transforms (LT's), essential for sealed setups.
Delay,decay, dynamic eq, parametric eq..
You can also link them and it can be controlled via a computer.

It's basically the best thing since sliced bread for a loudspeaker system.

mynym

DCX2496 For Dummies

Quote:
Originally Posted by Ricci
Get a USB to RS232 cable (monoprice has a nice one for cheap) and download the software from Behringer to control it on your computer, if you haven't already done so. That's #1.
Sweet!

Didn't realize it could handle USB. Bought the USB to RS232 interface from Monoprice.

Been meaning to get a cable for mine for awhile.

As far as this thread goes. A common question around the DCX is "How do I setup a subsonic below 20hz"

Perhaps some examples with figures that give a particular result.

Examples:
For a 19hz 4th order subsonic, do the following: ....
For a 18hz 4th order subsonic, do the following: ....
For a 17hz 4th order subsonic, do the following: ....
For a 16hz 4th order subsonic, do the following: ....
For a 15hz 4th order subsonic, do the following: ....
For a 14hz 4th order subsonic, do the following: ....
etc.
-------


So to start off:

Quote:
you can't ( as far as i can tell ) set any filter to lower than 20 hz on either DCX or DEQ however what you can do is:

1 - set SSF to 20 hz

2 - apply parametric boost at 20 hz at the same time

3 - apply CUT at around 25 hz or so

by playing with the parameters of these 3 filters you can get 2 and 3 to mostly cancel each other out above 20 hz but their net effect will be significant boost below 20 hz

this boost below 20 hz will interact with 20 hz SSF and the net result will be that the boost will largely get cancelled and SSF will shift down in frequency.

how much lower you would be able to push the SSF frequency would depend on the order of the highpass. you would be able to push a 6db/oct highpass much lower than a 48db/oct highpass.
And another:


Quote:
To create a subsonic filter using Behringer DCX2496 or DEQ2496

Well, that's actually quite easy. The DCX does not have ability to set filters below 20Hz. While this may seem to high, it's not really. You can easily extend the actual filter by for example setting high pass filter to 20Hz, 2nd order, Butterworth. Now add a single parameteric band at 20Hz in the EQ section on the unit, set to Q of 1.5 and gain of +4 dB. This will counteract and extend the roll off, giving you an effective roll off on the 13w7 of -3dB around 17Hz and -6db around 14hz, with rapid roll off after this; exactly what you want with this 10 cubic foot cabinet tuned to about 16Hz to prevent excessive excursion under this tuning frequency.

...
..

-Chris
More: http://www.avsforum.com/avs-vb/showt...3#post16235103

mynym

DCX2496 For Dummies

Is the DCX basically the feedback destroyer with an equalizer? I seem to remember reading that it has FDB features in it.

stgdz

DCX2496 For Dummies

Get a USB to RS232 cable (monoprice has a nice one for cheap) and download the software from Behringer to control it on your computer, if you haven't already done so. That's #1.

Ricci

DCX2496 For Dummies

I actually have a server with a serial port so I used that to connect to it. They are both in the same rack so it made it even easier. I then just RDP in from my laptop.

I was surprised at how few of my computers have a serial port. Good idea using a usb one.

shepP

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