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Old 9th September 2012, 04:39 PM   #3321
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Default volume control

Quote:
Originally Posted by yoke View Post
Hi
I belive that this was answerd before...but my pc is dead and search via mobile is frustrating...but ;
Can I place 6 channel, 5k, pot at the output of DCX2496 to drive Pass aleph clones (aleph30 and aleph mini) without preamp ?

Should I worried about something ?..just plug and play ?
Thanks

I haven't done this yet because other projects are first,but this is what I was going to do Try one channel and see
I had a pic but it's not on this computer,but the pot 10K goes right at the same spot as mute transistor,here's a link( Digital Line Level DACs, Digital Crossovers, Equalizers, etc. )
NS

Last edited by noSmoking; 9th September 2012 at 04:57 PM. Reason: found the link
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Old 9th September 2012, 07:58 PM   #3322
yoke is offline yoke  Croatia
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Quote:
Originally Posted by noSmoking View Post

I haven't done this yet because other projects are first,but this is what I was going to do Try one channel and see
I had a pic but it's not on this computer,but the pot 10K goes right at the same spot as mute transistor,here's a link( Digital Line Level DACs, Digital Crossovers, Equalizers, etc. )
NS
Could you please reload link...I don't see it ...thanks
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Old 9th September 2012, 08:00 PM   #3323
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Looking at the Behringer manual it seems that all the attn/gain structure is done in the digital domain. Might be why everybody says these are noisy.

An EV I have does this a little differently. Input sensitivity is done in analog prior to ADC. Internal (digital) clip levels are set here. Gain/Attenuation can be had in the digital domain ... but as the EV also has individual output controls after DAC ... attenuation is best done here. Driver level equality, etc. Gain can be done digitally ... but if the internal processor is clipped (as a result) you'd need to attenuate the input level (in the analog stage prior to ADC) to realign the input sensitivity as to not drive the internal (digital) processor into clipping.

As it looks with the DCX, having no analog attenuation capability, any attenuation with that unit will result in raising the noise floor. You do have more headroom with 24bits ... but as this unit is not likely being used in the recording process, I'm not sure of the "extra bit" benefit here. Program material in the audible range doesn't use all 24bits ... so any perceived headroom (by specification) isn't there anyway. You're still bound by the programs playback structure.
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Old 9th September 2012, 10:11 PM   #3324
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That's why you go digital in, xfmr coupled out into passive attenuator with buffer. Get the most out of the fairly-well-done digital/DSP section, and maximum analog S/N. easy to do with simple mods (no board level soldering required).

IMO anything else is compromised, or adds additional complexity needlessly.

Strong vote for Jensen or Cinemag line out.xfmrs.
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Old 9th September 2012, 10:21 PM   #3325
SY is offline SY  United States
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Why not just passive RC couple outs? That's what I've been using (balanced), better for gain structure at domestic line levels.
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Old 9th September 2012, 11:14 PM   #3326
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SY ... gain structure should be established right up front. Boosting or attenuating the post processed signal is another matter. I don't see that as part of "gain structure" per say.
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Old 10th September 2012, 12:53 AM   #3327
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Hi yoke,
Go to the forum,digital line level,Dcx2496,volume controls start on post 22,I was going to use one pot per channel as I have 2 dcx2496 each channel has it own dcx 3 way and a sub,You can also use a ultra link, I'm doing that now for level adjustment,Jan Didden has made a board for the volume control,also Apox and several other Just google it dcx2496 mods,a ton of articles out there,if you need the schematic it's in google groups(DCX2496) and alot of good info there too!
Good luck,
NS

Last edited by noSmoking; 10th September 2012 at 01:03 AM.
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Old 10th September 2012, 01:01 AM   #3328
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Quote:
Originally Posted by SY View Post
Why not just passive RC couple outs?
'cause the transformers sound better. I did blind tests, I preferred the transformers. RC is much better than what's in there, tho.
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Old 10th September 2012, 02:14 AM   #3329
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Quote:
Originally Posted by puppet View Post
SY ... gain structure should be established right up front. Boosting or attenuating the post processed signal is another matter. I don't see that as part of "gain structure" per say.
But it is. If you put voltage amplification after the DAC, as Behringer did, the levels will be too high for home use unless they're digitally attenuated. This compromises S/N and audibly so. Gain structure is just wrong for home use.

Pano, recall that I use a preamp with input transformers. No OPTs needed.
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Old 10th September 2012, 06:43 AM   #3330
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Quote:
Originally Posted by noSmoking View Post
Hi yoke,
Go to the forum,digital line level,Dcx2496,...........you need the schematic it's in google groups(DCX2496) and alot of good info there too!
Good luck,
NS
Thanks...will look
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