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Old 5th March 2013, 12:26 AM   #6511
robbbby is offline robbbby  Canada
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Quote:
Originally Posted by robbbby View Post
Double checked all connections with nampon already and all was good. Sent hypex support an email, hopefully I hear from them soon, I really want to solve this, sucks not having music.
Just heard back from hypex, they said it may be the over voltage protection kicking in and that I need to apply 3VDC to a couple of the pins to recalibrate it. I'm also still stumped as to how/why this would happen. The cutout is very random, but now it appears that when it happens it cuts out the channel and it does not come back on. Sometimes it will work for 3+ hours before the left channel goes into silent mode and sometimes it is within 5 minutes of me turning them on.
Anyone have any insight to this? Also going to have to try and find a 3VDC source. I'm guessing 2 AA batteries in series are my best shot?
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Old 5th March 2013, 12:41 AM   #6512
Regnad is offline Regnad  United States
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When I had the problem I was told to use a calibrated lab supply. Did Hypex suggest the batteries?
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Old 5th March 2013, 01:51 AM   #6513
robbbby is offline robbbby  Canada
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They did not tell me to use batteries, they just said "You could try recalibrating it by applying exactly 3.0 V DC to programming header J13."

I did not realize how critical it was and that it would need a calibrated lab supply. I have no way of getting 3VDC and figured 2 1.5V cells would have worked.
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Old 5th March 2013, 05:32 AM   #6514
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I'm not aware of any type of battery that under normal conditions outputs exactly the nominal voltage. a good 12V lead-acid battery outputs an open voltage of 12.7-12.8, a 1.5V battery outputs more than 1.6V etc.
it is definitely not your best shot.
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Old 5th March 2013, 11:06 AM   #6515
Julf is offline Julf  Europe
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Quote:
Originally Posted by robbbby View Post
I did not realize how critical it was and that it would need a calibrated lab supply. I have no way of getting 3VDC and figured 2 1.5V cells would have worked.
I am sure that the only "calibration" you need is verifying the voltage with a multimeter. 3V is a bit tricky - the usual fixed voltage regulators are 3.3 and 5 V, but you could go for a resistor + zener diode, or if you want to go fancy, a LM7833 or LM317 regulator.
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Old 6th March 2013, 08:33 PM   #6516
miero is offline miero  Czech Republic
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Quote:
Originally Posted by 3lviz View Post
Have you built an RC lowpass filter in the nCore inputs? I did that today (R=390R, C=15nF), and it seem that in my case it was an upgrade. I have M-DAC as a pre-amp. The change was suggested by M-DAC designer.
Is this valid for all M-DAC filters or only for its Optimal Transient filters?

Because JohnW mentions these only -- pink fish media - View Single Post - MDAC first listen (part XVIII)

Standard slow/sharp roll off filters of ES9018 seem to have stopband low enough (<100dB) to do not make trouble.
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Old 6th March 2013, 08:58 PM   #6517
3lviz is offline 3lviz  Finland
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Quote:
Originally Posted by miero View Post
Is this valid for all M-DAC filters or only for its Optimal Transient filters?

Because JohnW mentions these only -- pink fish media - View Single Post - MDAC first listen (part XVIII)

Standard slow/sharp roll off filters of ES9018 seem to have stopband low enough (<100dB) to do not make trouble.
I suppose its only for the OT filters. However John was rather generic when talking about the problem tho. Didn't mention the OT filters.

John's post:
pink fish media - View Single Post - MDAC first listen (part XVIII)

Last edited by 3lviz; 6th March 2013 at 09:19 PM.
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Old 7th March 2013, 03:21 AM   #6518
cjf is offline cjf  United States
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Hello, I have a quick question I was hoping someone could answer for me about the types of IEC AC Inlets that can be used for the NC400/SMPS600.

Would there be any benefit in using a 20A 125v type IEC for someone intending to build a dual mono configuration with 2 x SMPS600 & 2 x NC400 modules in the same chassis sharing one IEC Inlet or is a 15A Inlet more then sufficient to drive the Amps to their full potential?

Thanks for any info you can provide.
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Old 7th March 2013, 04:08 AM   #6519
cjf is offline cjf  United States
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Ooops...I forgot to ask a few more things in my last post.

Given the scenario I described in my previous post where the build is a Dual Mono type in the same chassis, what is the best way to connect the ground wires from the NC400 modules? Should each NC400 be grounded to the metal foot of its partner SMPS600 amp that is feeding it or should a more "common" ground be established that ties both NC400's & both SMPS600's to a central point?

Is it safe to assume that the XLR Inputs should just be grounded directly to the back panel near where they enter the chassis?

Lastly, is anyone NOT grounding the IEC Input to the chassis at all and if so, is this a safe method to use (ie... not getting shocked when hands touch the chassis)? Is this a good approach to lower the chances of ground loops entering the signal chain?

Thanks again.
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Old 7th March 2013, 09:43 AM   #6520
Julf is offline Julf  Europe
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Quote:
Originally Posted by cjf View Post
is a 15A Inlet more then sufficient to drive the Amps to their full potential?
15 A @ 125 V is 1875 W - more than enough. What is the current rating of your wall socket?
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