I see the power industry puts the galvanic isolation between the driver and the transistors https://www.st.com/en/evaluation-tools/evalstgap4s.html
I see boxas as black boxes. If there is a 50dB gainstage in the box but there is a 40dB attenuator after the input terminals and a 10 dB attenuator before the output - the net gain of the box is 0dB.
You seem to describe a regime where "gain" is tied to some mechanism and attenuation to an other - I think it's best to be specific.
A volume pot has only negative gain - that's how I see it.
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You seem to describe a regime where "gain" is tied to some mechanism and attenuation to an other - I think it's best to be specific.
A volume pot has only negative gain - that's how I see it.
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Another issue with capacitive isolation is that there's absolutely no feedback at DC or lower frequencies which could seriously impact the DC accuracy and PSRR of the power amplifier. For example, a DC offset or a low frequency disturbance at the output doesn't get carried to the controller side and therefore never gets corrected for.
I suspect that DC handling might be a bigger problem in general than what we think. I'm also thinking in the direction that we should probably limit the pass band to make life easier on the reproduction chain - if we keep it reasonably wide it will I suspect suffice - say 10hz-30kHz -1 dB would be OK. Thus, I would feel OK with DC coupling the output stage and the input stage also so to avoid what you mention.
Then I would personally compensate for FR and phase problems coming out of these physical filters to get back a perfect pass band - on system level - i.e. from a .wav file to favourite listening position. I dint give a rats @SS about if some part is not perfect in the FR/phase department as long as I get a perfect system behaviour.
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Then I would personally compensate for FR and phase problems coming out of these physical filters to get back a perfect pass band - on system level - i.e. from a .wav file to favourite listening position. I dint give a rats @SS about if some part is not perfect in the FR/phase department as long as I get a perfect system behaviour.
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Bummer - what?
Your writing constantly has a shimmer of uncertainty. I'm sure it always sounds clear for you. Is this your wanted position?
You dont happen to often have a feeling of bing misinterpreted? Don't be afraid to be really clear.
You are alos not seldom quite frank - I hope you don't mind me being the same.
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Your writing constantly has a shimmer of uncertainty. I'm sure it always sounds clear for you. Is this your wanted position?
You dont happen to often have a feeling of bing misinterpreted? Don't be afraid to be really clear.
You are alos not seldom quite frank - I hope you don't mind me being the same.
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Quite the opposite in fact so I can not take this comment seriously. Reread this thread for instance. I am relatively certain connecting DACs directly to for instance Hypex Nc400's is close to a system error. Or what gain and volume control are. Maybe it is you that is what you accuse others of or you simply misinterprete or misunderstand stuff. One sees that more often, just like becoming personal (again) as a way out.
How frank do you want it to be? It are just words on a forum, not worth to get wound up over at all.
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Needed this in another thread. It may be more clear than I could explain what the drawbacks are of connecting sources directly to “open” power amplifiers and therefor maximum amplification of hiss, noise and whatnot (besides desired maximum so equal amplification of the level controlled output voltage of the DAC):
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This is basics really and I fully agree on all said. I think you are barking up the wrong tree really J-P. But thanks for the consideration anyway. There has never been any noise or clipping in any of my systems. I have had no problems with direct connections - it's was not until I did it that I reached the next level of transparency. This thread was an idea if it could be taken even further, not to solve "a problem".
I'm sorry if you had problems with this kind of system configuration because it really gives the optimal performance in my experience - even if the ground is indeed shared 😉
So to be clear - I'm not after a solution to a problem, I was off to progress the SOTA. Sorry to say, it doesn't seem to be possible.
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I'm sorry if you had problems with this kind of system configuration because it really gives the optimal performance in my experience - even if the ground is indeed shared 😉
So to be clear - I'm not after a solution to a problem, I was off to progress the SOTA. Sorry to say, it doesn't seem to be possible.
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