Can someone measure DC offset from RCA analog output on the Ultra ?
- Thread starter Musician
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Can you
) and frankly haven't heard of this issue before.
Can you give an example? This is new to me (been an "audiophile" for 35 years
) and frankly haven't heard of this issue before.This is risky, I warn you.
Mr Ee
Major Contributor
"Hope is not a strategy"
There are certain songs where my RME dac complains about DC, yet I've played them on my other systems with no apparent problems.
Maybe 'apparent' is the operative word here...
Cool. Was genuinely curious. Won't play it though
slartibartfast
Major Contributor
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So why do tracks like that exist?
I guess due to something wrong in production stage...
Thanks Obi-wan !
0.25 mV in idle is not alarming, probably because the opa1611 has low DC offset and are probably set to unity gain at the output ( used as buffer ) .
Ok….. there is some dc offset on the output on some material so one could have a 2 uF polypropylene capacitor in series with each of the rca + channel input in a Hypex ncore amplifier to be 100% safe. The ncore 125 and I suppose 250 has an input impedance of 50 Kohm. Those capacitors as example can be soldered on the inside of the power amps rca + sockets.
The frequency response will be down -6 dB at 1,6 Hz . No guarantee are valid after this operation, but it can be done .
Dayton Audio - DMPC-2.0 2.0uF 250V Polypropylene Capacitor
DMPC-2.0 2.0uF 250V Polypropylene Capacitor
www.daytonaudio.com
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So, why dont they use dc coupling capacitors on the analog output of the WiiM Ultra? Maybe for a couple of reasons.
Maybe they dont need to when using Opa 1611, especially in unity gain ?
It might also sound better without capacitor If the power amp already has dc protection . Most pre and poweramps have that. The Hypex ncore dont.
You will need some DC protection at the output of the source, or at the input of the power amp.
As this can be seen as a less good thing with the Ultra, we must remember that the low 11 Ohm output impedance is a really good thing were most japanese streamers have 500 ohm - 1 Kohm and cant drive some poweramps with lower input impedance.
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I was referring to input of power amplifier. I can't se any operating reason to not already insert a capacitor like you posted.
Static DC offset on output of any good op amp are generally low and not a problem. DC offsets from bad digital mastering, can be more harmful and any power amp inputs should consider this.
Maybe it's just a philosophical thinking but I see more logic and safe, to put the decoupling on power amp inputs.
Anyway, the suggested capacitor, can be mounted on a cable itself, without voiding warranty.
Static DC offset on output of any good op amp are generally low and not a problem. DC offsets from bad digital mastering, can be more harmful and any power amp inputs should consider this.
Maybe it's just a philosophical thinking but I see more logic and safe, to put the decoupling on power amp inputs.
Anyway, the suggested capacitor, can be mounted on a cable itself, without voiding warranty.
Yes, thats good advice: - inside a rca contact with a physically smaller cap, or split the rca cables in the middle with a little box containing one capacitor in series with + per channel.
It's not too uncommon to design electronics in such a way that each device has to protect itself from DC, if required. DC protected input, directly coupled output.
I have measured the DC offset on my Hypex ncore at the amplifiers loudspeaker output terminal with Ultra connected , it was only 2 mV so theres no worry
I have tested DC offset from the Hypex ncore amplifiers terminal with the Ultra as source.
Hypex ncore power amps do not have any dc protection on the rca input. This is unusual. The ultra do not have blocking capacitors on the rca output and could potentially send DC to the amplifier. Onlyoneme measured the DC offset in Ultra from the rca output to be 0.25 mV in idle, and 1.2 mV...
forum.wiimhome.com
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