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Old 3rd March 2012, 09:24 AM   #3211
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Location: PARIS FRANCE EUROPE
Yes I have 2 friends in France and It's also reported for otherone on DCX Yahoogroup.
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Old 3rd March 2012, 11:07 AM   #3212
Draki is offline Draki  Macedonia
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Fredsonqc
I am running direct out + and - signals from AK4939 to the primary of JT-11-EM (and exiting SE thru RCA). No other components (no resistor, no cap...). It works , so far. Are you saying that this is potentially wrong? Pls explain. I am not doubting you, just asking what is the correct way.
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Old 3rd March 2012, 12:12 PM   #3213
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Default DCX's AK direct transformer output ???

Quote:
Originally Posted by Draki View Post
Fredsonqc
I am running direct out + and - signals from AK4939 to the primary of JT-11-EM (and exiting SE thru RCA). No other components (no resistor, no cap...). It works , so far. Are you saying that this is potentially wrong? Pls explain. I am not doubting you, just asking what is the correct way.
Hi,
Yes It works! but...
I guess the problem guys had became because charge viewing by AK4393 (no 4939) was not 1k Ohm, depends also of course of amplifier input R value.

I do not know exactly when and why It was hapened because It's not my situation;

The other way of investigation should be the overload when switching on amplifier, depend on security with different amplifier (so many situation with so many amplifier I guess);
Another way became perhaps because no filtering at output ADAC and maybe some ground current appears.
So, usually It works, sometime It breaks down...
In doubt, my advise not to follow that issue...

Jan Didden did a great job with his firstly passive DCX output, and with that E/S new board, studying well how to feat with AK4393, and his mods maks the phase outputs better as well than original.
You are not obliged to mount the total kit, basis is enough as well.

my 2 cents
FRED
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Old 3rd March 2012, 05:40 PM   #3214
Draki is offline Draki  Macedonia
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It is of course AK4393 - sorry for the typo.
Based on what I think I learned about the DAC-transformer direct-out (from Jensen information prior to purchasing the trafos, also from the pool of knowledge from this forum) I made the simplest connection. Balanced V-out direct to the primary, no filter bcs the transformer blocks the DC by design, and the correct type of output transformer. The impedance of the transformer, the one that the DAC "sees" is actually depending on the next device' input impedance - it "reflects back" that into the primary, or so I understand.. In this case the next device is an active multi-channel volume controller with an input of 50 K so I guess the DAC "sees" a much bigger impedance than 1 K ... And it works OK. But after reading your posts I am doing a reality check. Anybody else to chip in?
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Old 3rd March 2012, 07:35 PM   #3215
AndrewT is offline AndrewT  Scotland
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The primary of the following transformer passes any DC imbalance around the transmit circuit.
It does not block that DC.

The transformer prevents the DC reaching the stage after the transformer.

Any DC imbalance in the primary circuit will lead to increased distortion as a result of increased saturation of the transformer.
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Old 3rd March 2012, 07:51 PM   #3216
Draki is offline Draki  Macedonia
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Thanks for that Andrew.
So - is a filter needed/advised in the primary circuit in this particular application?
Hmm I was sure I had done it right!!
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Old 3rd March 2012, 07:57 PM   #3217
AndrewT is offline AndrewT  Scotland
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I wonder if Fredsonqc is referring to the same anomaly/reliability?
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Old 7th March 2012, 02:06 PM   #3218
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Hi!
Is there a way to switch between my own presets from the remote?
I manage only to get what i think is the "stock" presets.
Click the image to open in full size.

With the "Load internal presets" It wants me to locate a file on the computer.
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Old 7th March 2012, 02:20 PM   #3219
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You can erase one by one all the stock presets (it's easier with the DCX than with the remote). Then you save the result on your PC as "empty session". You just have to recall this one everything you need to create a new family of settings for a new speaker, a new room or whatever.
Don't forget to save before loading a new one...
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Old 8th March 2012, 03:07 AM   #3220
jtalden is offline jtalden  United States
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Quote:
Originally Posted by Viper_user View Post
...
Is there a way to switch between my own presets from the remote?
...
When you "synchronize" be sure to check both the box for the current session and for the internal presets. That will load your custom presets instead of just the defaults.
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