This is a review and detailed measurements of the boXem Audio Arthur 4222/E1 mono power amplifier. It was sent to me by the company and costs €1,490.00.
The design is quintessential European with gray body and colorful front panel which I like. The only power button is on the back:
Fortunately you have trigger input so you can set it to power up when the source turns on. Three gain settings are provided which is very nice. Unlike some amps in its class, it has both XLR balanced and RCA unbalanced inputs.
The amplifier is class D and is based on Purifi 1ET7040SA module.
EDIT: amp is 4222, not 4215.
boXem Arthur 4222/E1 Measurements
I started with the input gain set to low:
This is superb performance and easily lands the unit in our top 5 amplifiers ever tested:
To get to full power with low gain, you need 9+ volts of input. So I set the amp to medium gain where 4 volts is enough to push it into clipping. Performance thankfully remains the same:
Signal to noise ratio is exceptional:
Low distortion translates into very high distortion-free dynamic range:
Frequency response is load independent and quite flat in audible band:
There is healthy amount of power available into 4 ohm:
Company asked me to also test 2 ohm performance:
We get the same low noise and distortion into 8 ohm:
There is some "ballooning" of the distortion curve at higher frequencies:
As noted, this is still very good for class d amplifier.
Conclusions
Building on solid foundation of Purifi amplifier module, the 4215/E1 delivers the goods with tons of power with very low noise and distortion. And it does so in a compact and attractive box with nice feature list. Not sure what else there is to ask for. Yes, the price is a bit high but you are getting European build and support so you need to value that as well.
It is my pleasure to recommend the boXem Arthur 4222/E1 amplifier.
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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/
The design is quintessential European with gray body and colorful front panel which I like. The only power button is on the back:
Fortunately you have trigger input so you can set it to power up when the source turns on. Three gain settings are provided which is very nice. Unlike some amps in its class, it has both XLR balanced and RCA unbalanced inputs.
The amplifier is class D and is based on Purifi 1ET7040SA module.
EDIT: amp is 4222, not 4215.
boXem Arthur 4222/E1 Measurements
I started with the input gain set to low:
This is superb performance and easily lands the unit in our top 5 amplifiers ever tested:
To get to full power with low gain, you need 9+ volts of input. So I set the amp to medium gain where 4 volts is enough to push it into clipping. Performance thankfully remains the same:
Signal to noise ratio is exceptional:
Low distortion translates into very high distortion-free dynamic range:
Frequency response is load independent and quite flat in audible band:
There is healthy amount of power available into 4 ohm:
Company asked me to also test 2 ohm performance:
We get the same low noise and distortion into 8 ohm:
There is some "ballooning" of the distortion curve at higher frequencies:
As noted, this is still very good for class d amplifier.
Conclusions
Building on solid foundation of Purifi amplifier module, the 4215/E1 delivers the goods with tons of power with very low noise and distortion. And it does so in a compact and attractive box with nice feature list. Not sure what else there is to ask for. Yes, the price is a bit high but you are getting European build and support so you need to value that as well.
It is my pleasure to recommend the boXem Arthur 4222/E1 amplifier.
-----------
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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