BOXEM Audio | Arthur 4215/E2 Purifi Amplifier | Owners' Thread

[amper42]

Yeah it's warm, not really that hot, quite amazing the efficiency of this Purifi board

That's one of the reasons I like to stay with the Purifi design. It uses almost half the power of my Hypex amps at normal listening levels and it runs 20F+ cooler. Once you realize it's difficult to hear a difference between the Hypex and Purifi amps the lower energy use and cooler running design makes Purifi a winning pick!

In a blind test the way I can tell if it's a Purifi running is simply to put my hand on the case. Nothing else runs this cool after an hour.

 

[boXem]

Fred - have you ever seen an Arthur 4215/E2 run hot? I can't imagine how I would get mine to run anywhere near as hot as my Denon 4700 or my Buckeye NC502MP amps. With two Revel F328Be powered through RME ADI-2 DAC FS to Arthur 4215/E2 I can barely get the amp above room temp.

The question here is the definition of hot.
Amp temperature is always an offset added to the room temp.
Room temp at 20 degC (68 degF) with an offset of 10 degC will be slightly warm to the touch (30 deg C - 86 degF) while with the same use profile with a room temp at 30 degC will make the amp will feel hot (40 degC - 104 degF).
PS: before writing this I never realized how much the Farenheit scale complicates the understanding of simple stuff.

 

[Doodski]

PS: before writing this I never realized how much the Farenheit scale complicates the understanding of simple stuff.

We dealt with Imperial measurement for a long time. From liquids to distances and physics calculations requiring additional calculations it made life more busy for sure. Now we have metric and things are better. (Canada)

 

[whislai]

Quick update with the Arthur power amp experiment, my AliExpress C3850 preamp clone arrived today, it seem it sound a bit of bass hump with several gears matching in the process with best matching surprisingly is a MOTU M4, I don't know I feel this gear has very light sound based on my impression could be due to the OP-AMP implementation, after some testings and critical listenings, I finally feel best go with the Gustard H16 preamp set at full volume, DAC is SMSL C100 serve as preamp volume control with remote, my guess is the Gustard acts as a lightweight limiter to "screechier sound" for high frequency at higher volume, at extreme volume I think also can sound a bit bright. Few things I don't like the Gustard until I wanna sell it (now I'm keeping it as it's best matching I have now) is mechanical stuff like clicking sound when turning the volume, no way to turn off headphone while listening to preamp, not so impressive volume knob, well something like Khozmo design is sophisticated, though plan to look for another "Gustard" preamp house sound though...

 

[Firespeed]

Hello everyone,

I take the liberty of intervening in this subject, having recently acquired an Arthur 4215/E2 (second hand for the price of the LA90 - a bargain!).

Up until now, I've had an LA90 Descrete, which I've been very happy with. I have nothing against Topping, really. It represents an important step in the quality of my system.

But now I understand the importance of power in an amplifier...

Indeed, my speakers (rated at 6 ohms minimum) are not difficult to power, but they're not the most efficient in the world, and since Arthur's arrival, they've come into their own!

I haven't noticed any difference in terms of transparency, neutrality and reproduction quality, but I can easily hear the difference in terms of spatialization and stage depth. It's incredible to feel the sound so wide and so deep! Crosstalk is also far superior, and that's certainly the first thing I heard when I first listened to it. This crosstalk is extremely pleasant, and it's fun to follow the movements from left to right on some tracks or in some films. Like others here, I also found punch in the attacks and percussion of mid basses. It's jubilant.

In short, I'm a witness to the quality of Purifi modules, the excellent integration of Boxem craftsmen and, from now on, the importance of having power in reserve to hold speakers properly.

I can now consider changing speakers if the mood strikes me!

A question if you don't mind me asking: what would a dedicated preamp bring me between my DAC and Arthur? At the moment, volume management is handled by the DAC (E70 Velvet configured at 5V max and Arthur's gain set to medium).

Finally, I wouldn't have got here without ASR and its experts, who contribute to all these subjects, and I'm naturally thinking of Amir, Boxem founder, Vintage Flanker and all those I'm forgetting who participate with their clear, educational explanations.

Thanks again, and happy music-listening to you all!

 

[amper42]

If you use the RME ADI-2 DAC FS with the Arthur 4215/E2 the "Loudness" function can offer you a new level of sound quality. You can individually adjust the bass and treble frequency settings to match your desired sound quality and they automatically adjust as the volume level changes. It's quite remarkable. If you thought you noticed a difference adding the Arthur 4215/E2 wait until you connect the ADI-2 DAC FS and learn to adjust the "Loudness" controls to fit your listening needs. There is absolutely nothing like the control it offers discriminating listeners.

The recently added computer remote app for the ADI-2 DAC FS makes learning how to use the "Loudness" controls easy. You can dial in the exact sound you desire while listening to your favorite music tracks. Want more definition to the sound? What more bass thump? It can do it. Want to match the sound you have on another system? It can do it. ADI-2 DAC FS loudness control offers an amazing toolbox for speakers, all at the touch of your PC/Mac or iPad.

 

[Firespeed]

If you use the RME ADI-2 DAC FS with the Arthur 4215/E2 the "Loudness" function can offer you a new level of sound quality. You can individually adjust the bass and treble frequency settings to match your desired sound quality and they automatically adjust as the volume level changes. It's quite remarkable. If you thought you noticed a difference adding the Arthur 4215/E2 wait until you connect the ADI-2 DAC FS and learn to adjust the "Loudness" controls to fit your listening needs. There is absolutely nothing like the control it offers discriminating listeners.

The recently added computer remote app for the ADI-2 DAC FS makes learning how to use the "Loudness" controls easy. You can dial in the exact sound you desire while listening to your favorite music tracks. Want more definition to the sound? What more bass thump? It can do it. Want to match the sound you have on another system? It can do it. ADI-2 DAC FS loudness control offers an amazing toolbox for speakers, all at the touch of your PC/Mac or iPad.

Thank you amper42 !!!

Will have a look...