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Read the newly written review with the correct measured values.
audiosciencereview.com
"Edit : Fatal mistakes has founded.
Do not use SIANAD and Other numbers of this review.
I'll post new review and data ASAP."
This is a review and undetailed measurements of the Marchaudio P422 stereo class D power amplifier. It is on kind loan from myself and costs US $1,988.68(P422 $1,675.21 + shipping to South Korea $132.68 + import tax $180.79).
P422 is Purifi 1ET400A based amp with costom designed Power supply and buffer board
Nice cushioning.
Neat anodised Al body.
BP feels very nice, esp. smooth-knob-like-feel of thread(but if you use this on your loudspeaker project, hole need to be sealed).
but for amp? just really good at all.
USB A(1 RED, 4 GND)-3.5(TIP, GND) 5V connection will work well with PC.
100-240V 50-60Hz, without selector(full-auto-plug-n-play).
Piezo switch
ON
Custom gain of mine.
With this newest buffer board of Marchaudio, I can get dual gain.
Marchaudio's future models will have gain selector switch outside(in my case use jumper).
Disclaimer!
I do not recommend open the chassis of Marchaudio AMPs.
It can be harmful, Danger of electric shock and burns from contact with live parts. injury from exposure to arcing, fire, and immediate expire the warranty.
Well tied.
Well tied too.
Nice.
Provided with nice looking USB, Manual inside.
(back ground is Kangaroo rather strop from Jende Industries)
Tools
Disclaimer
1.Our dummy loads were not appropriate. (also, not Simulated load)
2.We didn't use any digital filters.
3.So, some of these could be trash data. careful understanding is required.
"Edit
Fatal mistake has founded.
Do not use SIANAD numbers of this review.
You can check the Voltage at oscilloscope window, 9 V
It's not an 5 W for 4 Ohm, we pushed way more...
We used different projects with level sweeps and others(but still possibilities of same mistake has occurred...). But 5 W SINAD shows 100% wrong W, It's not 5, 10 W
I can't understand myself, how could I done this.
Still data can be used as checker for L/R uniformity. but yes otherwise we lost reliability of our data so we have to re-measure them all.
Our team is now working hard on new loads, AP's AUX-0040 filter, and proper settings.
I promise, next measurements are fully checked before posting. sorry for make massive inconvenience."
This is only one sample, does not represent the performance of all products.
@4 Ohm 5 Watts @4 Ohm 10 Watts
Difference between Ch1, 2 is not amp's characteristic.
Load made noises, real SINAD is higher.
@4 Ohm 5 Watts @4 Ohm 10 Watts
Exchanged Amp's Ch(L/R->R/L) shows same results.
The Amp does not make any significant Ch difference at all . both Ch are same
@4 Ohm 5 Watts @4 Ohm 10 Watts
It seems P422 can rated least 105-106dB.
nice.
@4 Ohm 5 Watts Not sure
(https://www.audiosciencereview.com/forum/index.php?threads/topping-pa5-review-amplifier.28512/)
Multitone looks great.
well suppressed noise floor rise at high frequency.
@4 Ohm 5 Watts Not sure
Fr : textbook-like
@4 Ohm 5 Watts Not sure
Crosstalk soso.
but, yes it's Still OK!
@2 Ohm but not sure about settings
It shows little instability, but some of that instabilities are caused by load(heat noise).
Still provide massive power.
(https://www.audiosciencereview.com/forum/index.php?threads/topping-pa5-review-amplifier.28512/)
@4 Ohm but not sure about settings
Yes, what we wanna see. even with our resistors, looks great
With proper load we would see cleaner power.
(before measurements)Meaningless subjective assessment with my own iron ears(Just cry).
It sound like crystal clear.
and I close my eyes, soon It disappears into the air feels like amp doesn't exist.
Even Otaku-music(hard to drive), it drives well.
Conclusions
I'm happy to recommend the Marchaudio P422 Stereo Amplifier.
Reasonably priced neat Purifi based amp with nice PSU and Buffer board with RF filter for prevent IMD(Important in Class-D) Made in Australia
You can personalise the Gain of this amp when you order. it's sweet.
I learned my ignorance and importance of loads heat control ability.
And how powerful high-power amp like this.
"Edit : AMP seems nicely worked in hard conditions. But by My faults, data has no reliability.
You should not judge anything based on this review.
Our team will prepare and re-measure them all for next post. Again data of this post has non of reliability. "
Bonus
E1DA Cosmos APU
USB-C powered Clean preamp with 48v Phantom power and Notch filter
Marvel of @IVX
Nice clean notch
Didn't capture 60dB gain settings, but I can confirm myself couldn't see any increase of noise floor even @ 60 dB Gain.
Conclusions
I'm happy to recommend the E1DA Cosmos APU too.
Giant Bang for the buck.
This review is powered by 스피커 갤러리(Speakers gallery) of DC inside

Marchaudio P422 Stereo Power Amplifier Renewed Review
After massive failure with my previous review(https://audiosciencereview.com/forum/index.php?threads/marchaudio-p422-stereo-power-amplifier-review.35969/), I got great technical supports from ASR, Speaker gallery of DC inside, E1DA Discord Channel(@IVX, @staticV3 ) and Marchaudio. (Detail for...

Do not use SIANAD and Other numbers of this review.
I'll post new review and data ASAP."
This is a review and undetailed measurements of the Marchaudio P422 stereo class D power amplifier. It is on kind loan from myself and costs US $1,988.68(P422 $1,675.21 + shipping to South Korea $132.68 + import tax $180.79).
P422 is Purifi 1ET400A based amp with costom designed Power supply and buffer board
Nice cushioning.
Neat anodised Al body.
BP feels very nice, esp. smooth-knob-like-feel of thread(but if you use this on your loudspeaker project, hole need to be sealed).
but for amp? just really good at all.
USB A(1 RED, 4 GND)-3.5(TIP, GND) 5V connection will work well with PC.
100-240V 50-60Hz, without selector(full-auto-plug-n-play).
Piezo switch
ON
Custom gain of mine.
With this newest buffer board of Marchaudio, I can get dual gain.
Marchaudio's future models will have gain selector switch outside(in my case use jumper).
Disclaimer!
I do not recommend open the chassis of Marchaudio AMPs.
It can be harmful, Danger of electric shock and burns from contact with live parts. injury from exposure to arcing, fire, and immediate expire the warranty.
Well tied.
Well tied too.
Nice.
Provided with nice looking USB, Manual inside.
(back ground is Kangaroo rather strop from Jende Industries)
Tools
Disclaimer
1.Our dummy loads were not appropriate. (also, not Simulated load)
2.We didn't use any digital filters.
3.So, some of these could be trash data. careful understanding is required.
"Edit
Fatal mistake has founded.
Do not use SIANAD numbers of this review.
You can check the Voltage at oscilloscope window, 9 V
It's not an 5 W for 4 Ohm, we pushed way more...
We used different projects with level sweeps and others(but still possibilities of same mistake has occurred...). But 5 W SINAD shows 100% wrong W, It's not 5, 10 W
I can't understand myself, how could I done this.
Still data can be used as checker for L/R uniformity. but yes otherwise we lost reliability of our data so we have to re-measure them all.
Our team is now working hard on new loads, AP's AUX-0040 filter, and proper settings.
I promise, next measurements are fully checked before posting. sorry for make massive inconvenience."
This is only one sample, does not represent the performance of all products.
@4 Ohm 5 Watts @4 Ohm 10 Watts
Difference between Ch1, 2 is not amp's characteristic.
Load made noises, real SINAD is higher.
@4 Ohm 5 Watts @4 Ohm 10 Watts
Exchanged Amp's Ch(L/R->R/L) shows same results.
The Amp does not make any significant Ch difference at all . both Ch are same
@4 Ohm 5 Watts @4 Ohm 10 Watts
It seems P422 can rated least 105-106dB.
nice.
@4 Ohm 5 Watts Not sure
(https://www.audiosciencereview.com/forum/index.php?threads/topping-pa5-review-amplifier.28512/)
Multitone looks great.
well suppressed noise floor rise at high frequency.
Fr : textbook-like
@4 Ohm 5 Watts Not sure
Crosstalk soso.
but, yes it's Still OK!
@2 Ohm but not sure about settings
It shows little instability, but some of that instabilities are caused by load(heat noise).
Still provide massive power.
(https://www.audiosciencereview.com/forum/index.php?threads/topping-pa5-review-amplifier.28512/)
@4 Ohm but not sure about settings
Yes, what we wanna see. even with our resistors, looks great
With proper load we would see cleaner power.
(before measurements)Meaningless subjective assessment with my own iron ears(Just cry).
It sound like crystal clear.
and I close my eyes, soon It disappears into the air feels like amp doesn't exist.
Even Otaku-music(hard to drive), it drives well.
Conclusions
I'm happy to recommend the Marchaudio P422 Stereo Amplifier.
Reasonably priced neat Purifi based amp with nice PSU and Buffer board with RF filter for prevent IMD(Important in Class-D) Made in Australia
You can personalise the Gain of this amp when you order. it's sweet.
I learned my ignorance and importance of loads heat control ability.
And how powerful high-power amp like this.
"Edit : AMP seems nicely worked in hard conditions. But by My faults, data has no reliability.
You should not judge anything based on this review.
Our team will prepare and re-measure them all for next post. Again data of this post has non of reliability. "
Bonus
E1DA Cosmos APU
USB-C powered Clean preamp with 48v Phantom power and Notch filter
Marvel of @IVX
Nice clean notch
Didn't capture 60dB gain settings, but I can confirm myself couldn't see any increase of noise floor even @ 60 dB Gain.
Conclusions
I'm happy to recommend the E1DA Cosmos APU too.
Giant Bang for the buck.
This review is powered by 스피커 갤러리(Speakers gallery) of DC inside
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