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Behringer DCX2496 digital X-over
Behringer DCX2496 digital X-over
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Old 8th January 2010, 03:04 AM   #2211
then_dude is offline then_dude  Belgium
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Location: brussels
Default some basic questions

hello,

i wanted to post a question on the dcx2496 , and then i saw this post with 222 pages,


i would like to start building or at least start to look around for material for a 3 way open baffle speaker with the DCX in it.

i have some very basic questions.

let's say that i use 3 amps which are the same, let's say 100w,
these amps will drive the 3 drivers per speaker.

i know that the dcx hasn't got a volume pot, but you can build on in it after the signal turned to analog.

1)you can use a 6 channel pot
2)you can use a 6 channel stepped attenuator
3)you can use a 6 channel led volume pot

but if the amps are 100w, and the tweeter needs 3 watt, while the woofer is fed 100W because of EQ, can the DCX make up this difference in EQ ? wouldn't it be good to put a voltage divider in front of the amp for the tweeter ?

4)is it possible to use software as a volume pot ?
5)is it possible to use a pot in the digital of optical line before entering the dcx
6)what about playing records: it will have to ADC, what impact does this have on the sound ?

well a lot of questions, i know, i can't find the answers that fast, because all over the web so many people are busy with it. don't feel offened by my questions, i'm only looking for a short answer or a link where i can read the rest.

ps: i know that there are kits online for diy with a lot of mods, (like volume and psu) that one can buy.

thanks so much
greetz
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Old 8th January 2010, 03:15 AM   #2212
MJL21193 is offline MJL21193  Canada
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You can control the individual outputs with the built in functionality of the unit:

117.PNG

Understanding how much actual power of those 100 watt amps reaches the drivers is important.
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Old 8th January 2010, 03:24 AM   #2213
then_dude is offline then_dude  Belgium
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thanks mjl21193,

this function is made to adjust the drivers to each other, not for using as a volume pot i suppose.

still i think it is better to have the signal for the tweeter and midrage, (which will be much less then the bass) not to step down in the dcx but just in front of the amp, because small signals in interconnects is maybe not a good idea.

so i guess you can't use software as a volume pot : one switch that controls the thing.?
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Old 8th January 2010, 03:31 AM   #2214
MJL21193 is offline MJL21193  Canada
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Many here disagree but it doesn't need to be complex - a dual volume pot at the input of the DCX will work splendidly - that is more or less how I do it.
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Old 8th January 2010, 03:39 AM   #2215
then_dude is offline then_dude  Belgium
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the volume pot at the input: that is for the analog stage then ?

but what if you have a digital input ? do you use a "digital volume pot" there ?

i have seen that you loose some bits if you fiddle with the imput signal.

thanks
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Old 8th January 2010, 03:44 AM   #2216
MJL21193 is offline MJL21193  Canada
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What is your source?
Worrying about lost bits will give you a stress headache - don't do it.
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Old 8th January 2010, 03:47 AM   #2217
then_dude is offline then_dude  Belgium
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hahah,

my source is a digital line (cd)
and analog: tuner, phono
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Old 8th January 2010, 04:09 AM   #2218
DougL is offline DougL  United States
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Quote:
Originally Posted by then_dude View Post
hello,

i wanted to post a question on the dcx2496 , and then i saw this post with 222 pages,


i would like to start building or at least start to look around for material for a 3 way open baffle speaker with the DCX in it.

i have some very basic questions.

let's say that i use 3 amps which are the same, let's say 100w,
these amps will drive the 3 drivers per speaker.

i know that the dcx hasn't got a volume pot, but you can build on in it after the signal turned to analog.

1)you can use a 6 channel pot
2)you can use a 6 channel stepped attenuator
3)you can use a 6 channel led volume pot

but if the amps are 100w, and the tweeter needs 3 watt, while the woofer is fed 100W because of EQ, can the DCX make up this difference in EQ ? wouldn't it be good to put a voltage divider in front of the amp for the tweeter ?

4)is it possible to use software as a volume pot ?
5)is it possible to use a pot in the digital of optical line before entering the dcx
6)what about playing records: it will have to ADC, what impact does this have on the sound ?

well a lot of questions, i know, i can't find the answers that fast, because all over the web so many people are busy with it. don't feel offened by my questions, i'm only looking for a short answer or a link where i can read the rest.

ps: i know that there are kits online for diy with a lot of mods, (like volume and psu) that one can buy.

thanks so much
greetz
Perfect is the enemy of built.
I feed my DAC into a preamp with a 2 channel volume control. Output of DCX goes into my Dual 3 channel 30 Watt TEAC amps.
The 6 channel and digital input are said to be better.
Get started with the DCX analog input if its more convenient.

Comment one, its easier to get started with identical amps.
I use the DCX to balance the Woofer / mid tweeter sensitivities.
It works very well if woofer, mid and tweeter have roughly comparable sensitivity.

Comment 2, use a big enough baffle to get under 100 Hz without boost.

Comment 3: The ribbon cable can get noisy. If it happens, clean it.

Enjoy. I have 2 speaker builds with my DCX and would not go back.
Also feel free to contact me via the board if you wish.

Good luck.

Doug
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Old 8th January 2010, 04:33 AM   #2219
Pano is offline Pano  United States
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Behringer DCX2496 digital X-over
Seems like we need a "Using the DCX thread"

This one is mostly about modifying it - maybe we need one for questions, ideas and tricks about just plain using the thing. There is a lot to learn.
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Old 8th January 2010, 09:18 AM   #2220
mige0 is offline mige0  Austria
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Quote:
Originally Posted by SY View Post
If it affects the A/D or D/A, the result is easily measurable- plain ol' harmonic distortion.
Don't think you are on the right track regarding jitter outcome – but how you think this comes down to harmonics ??
- and what else you think could be affected by jitter other than AD or DA conversion ???

Quote:
Originally Posted by MJL21193 View Post
Yeah, we get it! Great measurements don't equal great sound - that horse is looong dead, stop whipping it!

Everyone of the tweakers trots out those testing results by Geddes to show that THD doesn't make a difference. If they said otherwise you certainly wouldn't see them here.You act as if THD is the only measurement - there are others that are important also.
Have some difficulties to translate "throtting" – anyway – the link I set was in order to give an example to Pano about the up's and down's that go along when you like to set up measurements at the border of what is measurable – and the thread linked actually was all about harmonics and noise – not too far off from what Pano wants to measure.

Besides that, I guess you didn't get the point of that thread – Earl stated that low level harmonics burried in the noise (AB crossover distortion of amps) *do* make up for a big difference – and it was the challenge to prove its *not* that way around - by delivering the *measurements* that harmonics fall monotony with signal - even way down in the noise floor ....

This, by the way, may easily get the challenge too when doing serious measurements of the DCX...

On the other hand for my taste its a little bit of quick shot to summarise that harmonics is what I'm only aware of in audio – no?

Michael

Last edited by mige0; 8th January 2010 at 09:48 AM.
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