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Old 31st August 2005, 04:12 AM   #11
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Join Date: Oct 2004
Send a message via ICQ to AnthonyPT
HI


The Behringer DCX2496 does seem to need a full
signal to get the most out of the unit.I came
across this 6 channel remote volume kit. It uses
LM1973n volume chips and then goes to TL072 output
buffers. The TL072 are easily updated with better
chips but if the LM1973Ns are ok it would make a
very neat solution to the DCX2496 volume issue.
Since it is a kit it pretty cheap at AUD$199.
It is a magazine design from Siicon Chip hear
in OZ. There may be some others that do
just the boards but here are URL about
the kit.
At the moment I am building a 24db/octave
3 way analogue crossover for my dipole panels.
Plan to migrate to the DSX and this 6 channel
volume control when funds become available.

regards

AnthonyPT

http://www.altronics.com.au/index.as...=item&id=K5600
http://www.siliconchip.com.au/cms/A_30608/article.html
http://www.decibelhifi.com.au/webcontent10.htm
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Old 31st August 2005, 04:31 AM   #12
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Hi

Just came across this other page
that has downloads for the boards
On my first post on this subject I
give myself an E minus for spelling!
Should also have been DCX not DSX! ! !

So go to the bottom of this page for downloads.

Regards

AnthonyPT

http://www.siliconchip.com.au/cms/A_...ntArticle.html
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Old 31st August 2005, 05:16 AM   #13
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Location: Mars
Just annoyed by hassle of interfacing between pro with consumer gear. Essentially, getting it to work quietly with the amps I already had involved essentially another DIY project.

I'm running the Roland M1000 as the home audio interface to
proaudio and it's working well sonically. This method was recommended
on forums as the Roland provides the digital volume control. I did have
to buy an inline transformer to convert SPDIF to AES/EBU, but it didn't
cost much.

DVD player digital output -> Roland digital input -> Roland digital output -> impedance transformer -> DCX digital input -> amps

I also tried analog pathways using analog crossovers but the
DCX has more features that allowed better tuning to give me better
sound. I also tried the analog paths on the Behringer and Roland
and there is no sonic difference to digital paths.

The Roland is neat. It has one set of analog inputs and four
digital inputs, it's a mixer. I can feed the DVD player analog outputs
into the Roland and ALSO feed the digital output of the DVD player
into the Roland digital input and have the ability to choose which
pathway to use. You can compare analog to digital paths in real time
and I've been switching between the two and can't hear a difference.

I want to do another test where I will add more conversions
to see if the golden ears can detect all these conversions.
I'm going to do this for fun.

DVD player analog out [D/A] -> Roland analog in [A/D] -> Roland
analog out [D/A] -> DCX analog in [A/D} -> DCX analog out [D/A] - amps.

Five conversions, I wonder if the they can pass the blind test.
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Old 31st August 2005, 05:25 AM   #14
akunec is offline akunec  Canada
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Just visited the Behringer website.... After the new software revision of the DCX it has 15% more processor power.
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Old 31st August 2005, 06:22 AM   #15
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That Roland does sound interesting especially considering that all my current analog sources have digital outputs.

I did some testing with my attenuators. Set them up to greater than >24dB. How much more than that I don't know. I didn't have a 750R resistor so I used 540R. See Kuei Yang Wang's post.
Still can hear hiss at 8+ feet.

Swapped my newly rebuilt tube pre for a solid state. Hiss still there.

Reconfigured the DCX as 2-way replaced the mid/tweet with a pair of Dennis Murphy baffle-step-compensated MB20s. Efficiency in the 80's? This fixed the hiss. Can only hear it within a foot of the speaker.
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Old 31st August 2005, 06:24 AM   #16
mac is offline mac  United States
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Quote:
Originally posted by thylantyr
Just annoyed by hassle of interfacing between pro with consumer gear. Essentially, getting it to work quietly with the amps I already had involved essentially another DIY project.

I'm running the Roland M1000 as the home audio interface to
proaudio and it's working well sonically...
Another alternative is to use the Bill Dipoala DCX2496 boards. His output board allows you to use any opamp of your choice (AD823) with either pro or consumer level (RCA or XLR) outputs. In addition, it has a lot of other optional features including IR volume control, digital volume LCD display and Toslink input.

As a bonus, his boards fit neatly inside of the DCX.

I've been using one in my system for several months and am very happy with the sound and overall operation. Btw, it replaced a DEQX PDC.
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Old 31st August 2005, 01:38 PM   #17
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Quote:
Originally posted by ultrachrome
I did some testing with my attenuators. Set them up to greater than >24dB. How much more than that I don't know. I didn't have a 750R resistor so I used 540R. See Kuei Yang Wang's post.
Still can hear hiss at 8+ feet.
24db of attenuation is only 8 bits of dynamic range increase inside the DCX.. The real test is how many LED's where lit on the output channels during playback? Unless you can get all of them lit, just below clipping you're loosing lots and lots of precision.

--Chris
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Old 31st August 2005, 02:28 PM   #18
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Quote:
Originally posted by DIY_newbie


24db of attenuation is only 8 bits of dynamic range increase inside the DCX.. The real test is how many LED's where lit on the output channels during playback? Unless you can get all of them lit, just below clipping you're loosing lots and lots of precision.

--Chris
There is alot of comedy in audio.

Branwell posted this message;
http://groups.yahoo.com/group/DCX2496/message/415

From: Branwell <branwell1@...>
Date: Thu Jun 16, 2005 1:08 pm

Subject: Digital Volume Control for DCX based systems

Hello,

I have an active setup with the Behringer DCX 2496 crossover, and like most
home users, have had to address the volume control issue and level matching
for non pro amps.

The setups I have tried are:

1) CD ( digital out ) DCX ( analog out ) DACT 6 channel pot - Amps
2) CD ( digital out ) DCX ( analog out ) VCA based 6 channel pre
Amps

Both of these setups dealt with the level matching and allowed good volume
control.
Of the two, I preferred the sound of the active volume control as opposed
to the passive pot. A little more dynamic and sets up a more 3 dimensional
sound stage.

To try something different, recently I got a Roland M1000 digital mixer and
am using it to act as a volume control.
http://www.rolandus.com/products/det...&prodid=M-1000

CD ( digital out ) M1000 ( digital out ) DCX Amps

While this setup does not deal with the level matching issues ( Can add L
pad resistor setups in the interconnects between the Amp and the DCX ), it
does deal with the volume control.

Compared to the two analog volume control setups, the Digital volume setup
sounds more dynamic, more detailed and interestingly, more musical.


While this was fairly close to being apples to apples, the variables include:

Passive Volume Control:
Behringer to Pot Single ended.
Pot to Amps Single ended.

Active Volume Control:
Behringer to VCA - Balanced
VCA to Amps - Single ended.

Digital Volume Control:
Behringer to Amps Balanced.

The amps I have will take single ended inputs or balanced, so there was not
an amp change.

Could the balanced factor account for the perceived sound quality increase?.
Perhaps, but either way, for those that like the idea of a Digital volume
control, the M1000 is a viable solution.



////


I find it assuming that the Roland setup sounded better in spite
that it has three gremlins that people fear;

A. Upsampling
B. Roland digital attenuation, loss of bits.
C. Not driving the DCX to full lit LED's at low - medium volume levels.
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Old 31st August 2005, 02:51 PM   #19
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Thyl,

LOL, see my post above, what really matters is what YOU like other people's opinions are just enjoyable reading

I need to look at the roland's specs, but I'm assuming the digital volume control is more advanced then a simple bit shift operation. If the volume control adds some compression as it attenuates this would preserve some of the low level information, even enhance it at lower volume levels compared to either of the other post dcx volume controls. This would cause the sound to be more "dynamic" as it preserved some of the low level information...

Guess I should go find a spec for that Roland and check it out, untill then its just a guess

--Chris
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Old 1st September 2005, 06:01 AM   #20
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Join Date: Feb 2001
Location: Mars
Quote:
Originally posted by DIY_newbie
Thyl,

LOL, see my post above, what really matters is what YOU like other people's opinions are just enjoyable reading

I need to look at the roland's specs, but I'm assuming the digital volume control is more advanced then a simple bit shift operation. If the volume control adds some compression as it attenuates this would preserve some of the low level information, even enhance it at lower volume levels compared to either of the other post dcx volume controls. This would cause the sound to be more "dynamic" as it preserved some of the low level information...

Guess I should go find a spec for that Roland and check it out, untill then its just a guess

--Chris
http://www.htguide.com/forum/showthread.php4?t=14926
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