This we do not know, as there is no information about the input module. Are they regular opamps that amplify the signal, or is it a differential amplifier?
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Topping PA5 Review (Amplifier)
- Thread starter amirm
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tvrgeek
Major Contributor
ice module. All of them I have heard were terrible. 30 year old design. I hope for them I am wrong, but the PA5 seems to be todays most current design.
OK… It will drop the volume by X and X is audible… seriously, I give up trying to help anyone here and being consistently pedantically called out by terminology
tvrgeek
Major Contributor
Ok, Single ended input, so it is still a really sweet 20W amp.
Eggs Ackley
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I'm just going by the instructions and specs per the user manual. Ask Topping what they think it means.
KSTR
Major Contributor
Should not make any difference.
The whole idea of balanced input stage is that it extracts the difference between the (+) and (-) input pins no matter what the signals are on the input, and then re-references its output to the local ground -- this output can be unbalanced or balanced, the latter seems to apply here as the chip needs a signal-symmetric feed at its inputs.
If the PA5 relied on actual signal symmetry at its input and/or does not do the local dereferencing that would be a major design fail which I hope will not be the case here... but so far nobody has examined this. The use of a four-gang pot is somewhat suspicions, though.
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Again?Ok, Single ended input, so it is still a really sweet 20W amp.
It doesn't matter. The amplifier applies a gain of around 19dB from input volt to output volt. With a 2.6V input, and the gain of the amp, it outputs full power (just before clipping - or perhaps at the 1%thd level - I'd need to check to be sure).
That is irrespective of amplifier topology - we simply don't need to know that in order to understand what input voltage is required.
50W -40% is 30W. And that well below the clipping level, so very clean. You still seem hung up on 20Ok, Single ended input, so it is still a really sweet 20W amp.
Oh, and if you have a single ended device that can ouput 2.6V, it is still 50W.
No.
No its not about terminology or being pedantically. You got it completely Wrong.
Balanced or not will not change the volume at all.
Hint it is not what you think it means.
Balanced line - Wikipedia
The problem with using the wrong terminology, is you misinform others.OK… It will drop the volume by X and X is audible… seriously, I give up trying to help anyone here and being consistently pedantically called out by terminology
There is a huge difference between a volume drop of 50% and a volume drop of 11% - one might not buy the amp on the basis of one, and not be bothered much on the basis of the other.
To a Purifi challenging amp? Fantastic promise!
There IS a market for the PA5, at reasonable price.
Its about 160 V/A, that roughly matches its top power both channels driven. A bit close to the ragged edge.The size ratio of amp vs. power supply looks a bit crazy
Considering power supply, is this combination of 38V 4A used also with some other electronics, or is it unusual rating specific to this amp?
To nitpick a bit, I don't see efficiency numbers at Topping power bricks, is it not compulsory at least for EU market?
PS: all you folks screaming for teardown two seconds after review, I know you don't mean it, but it sometimes seems like Topping/John is some DIY/opensource buddy from your neighborhood without will/right for at least some amount of intellectual property.. should't he publish all the technical documentation right now for us and Topping rivals?
Are you planning on replying to one post on every page of this thread? If so, you might be here a while.
BoredErica
Addicted to Fun and Learning
What is the point of going around saying it's a 20w amp if you're not going to explain why?
DanielT
Major Contributor
I only follow this thread occasionally, with what then 20W? The effect Amir has measured so, .que?
I do not understand this long thread about PA5. It is obviously a really good amplifier for its effect it can produce. Really affordable, that related to performance.Just thinking about features and lack of remote control is something that prevents a purchase. Otherwise, it's just buy and be happy.
If it has enough effect, you can check here:
(I know you researched it, see it more as a general tip)
How much power does an amplifier need with this type of range of dynamic music
Feel free to use this calculator. Add sensitivity to the speaker and then tell which effect you have chosen and why. Weigh in that you want some headroom. http://www.mh-audio.nl/Calculators/REAP.html You can select music from this list. Or something else, but in that case tell us how you...
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BoredErica
Addicted to Fun and Learning
I don't understand your question. o.o
effect is a mistranslation (I think) from Swedish. Meaning power.
I paraphrase (apologies to Daniel):
"What the hell are (people) going on about 20W. Amir has measured the power here"
DanielT
Major Contributor
Sorry, it went a little wrong.
Power as:
effect is a mistranslation (I think) from Swedish. Meaning power.
I paraphrase (apologies to Daniel):
"What the hell are (people) going on about 20W. Amir has measured the power here"
...mentioned. Thanks Tony
...
It's not that bad, but now I got the opportunity to post a song that I recently discovered that I think is good.
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