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Old 21st December 2012, 05:55 AM   #271
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Quote:
Originally Posted by ds23man View Post
Dac: AK4396
Dac intergrator: NE5532
Balanced output buffers: OPA1632
Why this poor NE5532 ? High slew rate OPAs are better here, on my experience.
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Old 21st December 2012, 06:03 AM   #272
ds23man is offline ds23man  Netherlands
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Quote:
Originally Posted by Esperado View Post
Why this poor NE5532 ? High slew rate OPAs are better here, on my experience.
What is wrong with the NE5532??? Because it is an old design?????
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Old 21st December 2012, 06:22 AM   #273
qusp is offline qusp  Australia
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true high slewrate is preferred with first integrator IMO too, but the 5532 isnt as bad as many make out. I would choose something else, but then we didnt design it did we?
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Old 21st December 2012, 06:42 AM   #274
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Quote:
Originally Posted by ds23man View Post
What is wrong with the NE5532??? Because it is an old design?????
Slew-rate too slow, omho. And not very neutral (i use to compare with strait wire) .
Its main interest is high current, where we don't need here, because a better driver follows.
Are-they DIP or SOIC ?
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Last edited by Esperado; 21st December 2012 at 06:44 AM.
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Old 21st December 2012, 06:48 AM   #275
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Originally Posted by ds23man View Post
It maybe possible that PGA stands for programmable gain adjustment, aka the gain jumpers on the board. If I have received mine, I will check this!
Correct

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Originally Posted by Henkjan View Post
hope so, since that would send an ncore into clipping
The DLCP is not only able to drive the NC400, so that's why the output stage can drive the NC400 into clipping.

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Originally Posted by Omholt View Post
Plus 1.

Can anyone with more knowledge then me comment the strange samplingrate?
DSP sampling rate Fs 93.75 kHz
ADC sampling rate Fs 93.75 kHz
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Originally Posted by ChrisPa View Post
Possibly chosen to ensure it's always deliberately asynchronous
Correct, but there are a few other reasons too.

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Originally Posted by HFGuy View Post
Am I understanding this correctly, if using the AES input you can only do stereo ? But if you use the analog inputs you get 8ch in ?
There is one AES input available (L+R), and two analogue inputs (L+R). The optional Input board has 4 stereo analogue balanced inputs, switched with relays.

Quote:
Originally Posted by ds23man View Post
If you apply dither you can shave of more than 8 bits with digital volumecontrol!


Ok a part list:

Dac: AK4396
Dac intergrator: NE5532
Balanced output buffers: OPA1632
DSP: TAS3108
USB audio: PCM2704C
ADC: PCM4202
SRC: SRC4382
The NE5532 isn't used as DAC integrator! It's a voltage buffer, only used for a reference supply voltage.
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Old 21st December 2012, 06:53 AM   #276
AR2 is offline AR2  United States
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Quote:
Originally Posted by qusp View Post
it also ignores the difficulties of building a multichannel high grade analogue balanced control and the effect it has, with 12 decks minimum, with lower CMRR due to resistor matching (thus higher noise and higher distortion), OR a chip based digitally controlled analogue attenuator, which adds more active elements and lowers the performance to its performance.

man this is a hard nut to crack, the audiophile stubbornness is so strong with this issue, people that normally understand much more complex mechanisms somehow manage to miss the point with digital volume.

its made even more ironic by the venue here ie. a DSP/Crossover that uses these mechanisms at its very heart, if you cant palette digital volume, perhaps you should look at other devices....
Qusp,
to be honest, digital volume out of ESS chip is the first volume coming out of a silicone that sounds good. No other solution I ever heard was good, and that particularly stands for those PGA chips (not part of digital conversation, but still silicone). Analog was far better than any of those. Hearing digital volume out of ESS chip was revelation as well as relieve. As you are very well aware doing volume on multichannel is not a small task. As someone who was purist and kept analog volume as long as I could, I have to say, doing volume in digital domain, if done properly will do as good job as analog... almost.
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Old 21st December 2012, 06:56 AM   #277
Julf is offline Julf  Europe
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Quote:
Originally Posted by qusp View Post
man this is a hard nut to crack, the audiophile stubbornness is so strong with this issue, people that normally understand much more complex mechanisms somehow manage to miss the point with digital volume.
I guess they are so fixated on the incorrect image of the wave consisting of digital "steps".
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Old 21st December 2012, 06:59 AM   #278
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Originally Posted by Jan Willem Hypex View Post
The NE5532 isn't used as DAC integrator! It's a voltage buffer, only used for a reference supply voltage.
I understand better this choice, now.
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Old 21st December 2012, 07:03 AM   #279
PHEONIX is offline PHEONIX  Australia
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The AD797 has only 20V/us slew rate and as an integrator on the output of a Dac its the gold standard for THD and Noise performance in the audio bandwidth.

Qusp I have not found a part that has higher slew rate that beats in THD and noise performance in the audio bandwidth.

The Ne5532 bang for buck is very hard to beat, no part at its price has better or equal THD and noise performance.

Arthur
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Old 21st December 2012, 07:11 AM   #280
Julf is offline Julf  Europe
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Originally Posted by Davey View Post
Where is your system volume control when using the DCX2496?
In my source. Not ideal, but OK as a "transitional" system.

Quote:
It sounds like you will now have to un-modify your Ncores for use with the DLCP. Some simple, fixed attenuators installed between your DCX2496 could have (now) easily been removed to facilitate your DLCP integration.
I agree - it would have been easier to use attenuators. Well, the mod is not too hard to undo, just fiddly.

Quote:
We don't always have the option to avoid an amplify/attenuate scenario when integrating various commercial gear. A fixed attenuator is a sonically transparent option that can optimize gain structure in most situations.
I almost agree. I would say "mostly sonically transparent". You will have a less good impedance match because of the attenuator and a decreased signal-to-noise ratio compared to lowering amp gain, but mostly the difference shouldn't be audible.
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