This is review and detailed measurements of the KJF Audio MA-01 6-channel Amplifier populated with Hypex NC252MP stereo modules. It was kindly sent to me by a member. I configured it using their online tool and it shows a cost of US $1,868.
Not much to see or talk about as far as the case other than dual fans on top:
Thankfully they did not come on during my testing but it is good insurance to have given the total power this unit can generate.
The rear panel shows the usual balanced inputs although in this case it is 1/4 inch/XLR combo jacks:
For my testing, I focused on channels 1 and 2. Did plan to test the rest of the channels for total power but forgot that I had no way of generating that many balanced outputs so what you are about to see is for stereo only. Seeing how the amp modules are stereo anyway, this should be representative of what you get even if turned on the rest of them at full power.
KJF MA-01 Measurements
As usual we start with our dashboard:
We expect excellent performance from Hypex and we get it there, producing well above average SINAD which represents level of noise and distortion:
Signal to noise ratio is very high indicating a very quiet amplifier:
32-tone test signal simulating "music" shows very low distortion as well:
Frequency response is essentially flat with almost no dependency on whether I used 4 or 8 ohm test load:
This means the frequency response should not change much when you switch one speaker for another (an issue with cheap desktop amplifiers).
Crosstalk is very good:
The meat of an amplifier review is the amount of power versus distortion+noise so let's start with 4 ohm:
Spec is 250 watts which is what we get if we allow more distortion than I do in the above graph:
Seems that the power supply is designed to power the amp exactly as specified and no more and hence the lack of increase on bursts (above right).
Switching to 8 ohm we get:
I like the lower noise with 8 ohm better than 4 ohm.
Finally, there is a bit too much disturbance when we change frequency and sweep for power than I like:
But as noted on the graph, there are far worse examples.
Conclusions
The hypex NC252MP stereo amplifier modules do their job to product above average performance while running cool and efficient. While I have not yet looked inside the KJF amp, from the outside it seems like they have not done anything to lower the performance of these nice modules.
I am going to put the KJF MA-01 with Hypex NC252MP on my recommended list.
Edit: see teardown here: https://www.audiosciencereview.com/...ma-01-hypex-nc252mp-amplifier-teardown.22770/
------------
As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Not much to see or talk about as far as the case other than dual fans on top:
Thankfully they did not come on during my testing but it is good insurance to have given the total power this unit can generate.
The rear panel shows the usual balanced inputs although in this case it is 1/4 inch/XLR combo jacks:
For my testing, I focused on channels 1 and 2. Did plan to test the rest of the channels for total power but forgot that I had no way of generating that many balanced outputs so what you are about to see is for stereo only. Seeing how the amp modules are stereo anyway, this should be representative of what you get even if turned on the rest of them at full power.
KJF MA-01 Measurements
As usual we start with our dashboard:
We expect excellent performance from Hypex and we get it there, producing well above average SINAD which represents level of noise and distortion:
Signal to noise ratio is very high indicating a very quiet amplifier:
32-tone test signal simulating "music" shows very low distortion as well:
Frequency response is essentially flat with almost no dependency on whether I used 4 or 8 ohm test load:
This means the frequency response should not change much when you switch one speaker for another (an issue with cheap desktop amplifiers).
Crosstalk is very good:
The meat of an amplifier review is the amount of power versus distortion+noise so let's start with 4 ohm:
Spec is 250 watts which is what we get if we allow more distortion than I do in the above graph:
Seems that the power supply is designed to power the amp exactly as specified and no more and hence the lack of increase on bursts (above right).
Switching to 8 ohm we get:
I like the lower noise with 8 ohm better than 4 ohm.
Finally, there is a bit too much disturbance when we change frequency and sweep for power than I like:
But as noted on the graph, there are far worse examples.
Conclusions
The hypex NC252MP stereo amplifier modules do their job to product above average performance while running cool and efficient. While I have not yet looked inside the KJF amp, from the outside it seems like they have not done anything to lower the performance of these nice modules.
I am going to put the KJF MA-01 with Hypex NC252MP on my recommended list.
Edit: see teardown here: https://www.audiosciencereview.com/...ma-01-hypex-nc252mp-amplifier-teardown.22770/
------------
As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
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