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boXem Arthur 4222/E1 Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 8 2.3%
  • 2. Not terrible (postman panther)

    Votes: 11 3.1%
  • 3. Fine (happy panther)

    Votes: 60 16.9%
  • 4. Great (golfing panther)

    Votes: 275 77.7%

  • Total voters
    354

Sokel

Major Contributor
Joined
Sep 8, 2021
Messages
2,649
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2,149
So. the 1ET400A bolted to the chassis is absolutely fine.
Of course it is,measurements show that in detail.
But it would be nice to have a guide like Ice Power does for example giving the exact test conditions.
I will never claim that even the 300a2 is a better amp,is just nice to have some data to guide you.
 

caught gesture

Senior Member
Forum Donor
Joined
Feb 19, 2021
Messages
355
Likes
645
Location
Italia
Longevity of the electronics is important to someone like me who is still using “old” technology that just keeps working after almost two decades. The casework on what I have is all lovely aesthetics, but I’d happily compact the components and hide them away. I’ll replace when what I have starts to fail. It’s wonderful that I’ll be able to replace with cheaper, that measures better, and consumes less power. Longevity will still be a concern to someone like me who places a high value on sustainability, ie, what I have is good enough if optimised and knowing the limits of my ageing hearing!
 

mocenigo

Major Contributor
Joined
Dec 8, 2018
Messages
1,082
Likes
842
Of course it is,measurements show that in detail.
But it would be nice to have a guide like Ice Power does for example giving the exact test conditions.
I will never claim that even the 300a2 is a better amp,is just nice to have some data to guide you.

True. That would be nice. I think we could suggest it to Bruno, Kim Madsen and Co. They usually reply with the correct info if asked. So writing it down shouldn’t be difficult for them.
 

mocenigo

Major Contributor
Joined
Dec 8, 2018
Messages
1,082
Likes
842
Longevity of the electronics is important to someone like me who is still using “old” technology that just keeps working after almost two decades. The casework on what I have is all lovely aesthetics, but I’d happily compact the components and hide them away. I’ll replace when what I have starts to fail. It’s wonderful that I’ll be able to replace with cheaper, that measures better, and consumes less power. Longevity will still be a concern to someone like me who places a high value on sustainability, ie, what I have is good enough if optimised and knowing the limits of my ageing hearing!

100% ACK
 

dlaloum

Major Contributor
Joined
Oct 4, 2021
Messages
2,052
Likes
1,485
If I wanted to buy one I would buy one with heatsinks. However up to 10-20W continuous the plate affixed to the chassis is fine. I consider it a perfectly linear power amp up to those power levels and with a significant headroom for transients and short bursts. If you need 400W continuous from a 400W amp, you are either listening to crappy noise or your amp is seriously underpowered because you have no headroom, hence no dynamics, and when the music has a transient the amp turns off or something bad happens. That’s why there are 3KW amps.

So. the 1ET400A bolted to the chassis is absolutely fine.
Hmm my excessive expectations for over-engineering....

I know that in continuous terms, I seldom use more than 1 W - perhaps 5 W on the very most demanding material.... and peaks would max at 128W or thereabouts.... (at 8 ohm equivalent) - but those peaks do imply a 2 ohm max of 512W)

My current ClassD amps are rated at [email protected] Crown XLS2500... the Fans have never spun up... and the internal "heatsinks" - are negligible

So in terms of "reason" and "logic" - the heatsinks are unnecessary over engineering.

Here is the counter argument:

Class D amps are complex beasts, lost of tiny surface mounted components - difficult and expensive to repair at the component level - most repairs are achieved by replacing entire boards.

My 40 year old Quad 606 can be economically refurbished when it needs it (every 20 to 30 years?)

The Class D amps.... well their lifetime is likely to be between 10 and 15 years - after which they are probably junk, as their boards will no longer be available as spares/replacement parts...

If they are over-engineered in terms of heat-sinking - and kept at substantially lower average temperature for the components - their lifetime is likely to be substantially increased - potentially doubled or more.

Silicon component lifetimes tend towards a logarythmic curve when related to temperatures... yes they can run perfectly well without additional heatsinks... but drop the average temperature by 5C and you might find that the lifetime is doubled.

Just my 2c / thoughts
 

Gremlins

Active Member
Joined
Apr 25, 2021
Messages
117
Likes
56
Tested this week end ( saturday and sunday) boxem purifi Vs AUDIOPHONICS HPA-S400ET purifi at 1490e for stereo set up. Speakers were technics sb g90 and JBL L100 classics

Listening room has a good amount of treatment, source was qobuz via lumin



We were 4 folks and did lots of ABX listening

Conclusion : impossible to determine which amp was playing, period


Boxem was nice looking, so was the audiophonics that was over my expectations to say truth
 
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