Behringer DCX 2496 attenuation of outputs?

AndrewT · 21st April 2005, 09:11 PM

Hi all,
Getting ready to connect my digital xover.
What value of attenuation would be recomended for the outputs?
I will be using amps with 34db to 35db of gain with 90db/w speakers.
A db range to suit quiet and louder music would help.
I want to wire up a temporary attenuator until I have time to develop a digitally controlled analogue attenuator as suggestted in the thread that ran recently.

DougL · 21st April 2005, 10:12 PM

I am using 6 dB attenuation, simply by NOT shorting the - to ground on the Unbalanced output.

I would start there.

Doug

bzdang · 22nd April 2005, 03:55 AM

Here's the beginnings of a simple attenuator box with a stereo pot from Percy Audio and some ratshack parts.

AndrewT · 22nd April 2005, 06:57 AM

Hi,
The manual talks about automatic detection of unbalanced connections and adjusting gain to compensate. Have I reworded that correctly?
I intend connecting both hot & cold to a 10k for each, then connecting a dropping resistor (about 1k0 to 1k5) between the 2 10k's. That way it appears to be balanced, then tap off across the 1k0 as input to the power amp.
If output is +22dbu at clip then -6db still leaves +16dbu (almost 5v) at the input to the power amps. see my other thread re output voltage.

Davey · 22nd April 2005, 05:23 PM

Andrew,

Yes, you reworded correctly. That's exactly the way it works.

Your balanced attenuator configuration sounds good. The component values you mentioned would yield a little over 20db of attenuation which sounds about right with your high gain amplifiers. However, you may need to fine tune the values so the DCX doesn't clip. I would try maybe a 5k potentiometer in place of your 1-1.5k parallel resistor and experiment to find the optimum setting and then replace with a fixed resistor.

I am assuming your power amps have balanced inputs?

Cheers,

Davey.

21st April 2005, 09:11 PM	#1
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Behringer DCX 2496 attenuation of outputs? Hi all, Getting ready to connect my digital xover. What value of attenuation would be recomended for the outputs? I will be using amps with 34db to 35db of gain with 90db/w speakers. A db range to suit quiet and louder music would help. I want to wire up a temporary attenuator until I have time to develop a digitally controlled analogue attenuator as suggestted in the thread that ran recently.

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21st April 2005, 10:12 PM	#2
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 28	I am using 6 dB attenuation, simply by NOT shorting the - to ground on the Unbalanced output. I would start there. Doug

22nd April 2005, 06:57 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, The manual talks about automatic detection of unbalanced connections and adjusting gain to compensate. Have I reworded that correctly? I intend connecting both hot & cold to a 10k for each, then connecting a dropping resistor (about 1k0 to 1k5) between the 2 10k's. That way it appears to be balanced, then tap off across the 1k0 as input to the power amp. If output is +22dbu at clip then -6db still leaves +16dbu (almost 5v) at the input to the power amps. see my other thread re output voltage.

22nd April 2005, 05:23 PM	#5
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	Andrew, Yes, you reworded correctly. That's exactly the way it works. Your balanced attenuator configuration sounds good. The component values you mentioned would yield a little over 20db of attenuation which sounds about right with your high gain amplifiers. However, you may need to fine tune the values so the DCX doesn't clip. I would try maybe a 5k potentiometer in place of your 1-1.5k parallel resistor and experiment to find the optimum setting and then replace with a fixed resistor. I am assuming your power amps have balanced inputs? Cheers, Davey.