boXem A series

[Andysu]

but can it deliver han solo first on laserdisc in Dolby Stereo ?

 

[Stinga]

Any reason anyone would prefer the Purifi modules vs the NCx500 variant when it offers more power ?
Is the Purifi offering cleaner power?
Al

 

[amirm]

Any reason anyone would prefer the Purifi modules vs the NCx500 variant when it offers more power ?

It is a trade off between more power and cleaner high frequency response.

 

[WeekendWarrior]

Other than the casing, what's the main difference between the A series and the Arthur versions of the 4216/E2, and in what use case would one be preferable to the other?

 

[thegeton]

Other than the casing, what's the main difference between the A series and the Arthur versions of the 4216/E2, and in what use case would one be preferable to the other?

Arthur has three gain settings vs. two for the A 4216/E2.

 

[bibi2000]

I am a happy owner of a boxem amp since 2 years. Working 4-5 hours per days flawlessly.

 

[boXem]

Other than the casing, what's the main difference between the A series and the Arthur versions of the 4216/E2, and in what use case would one be preferable to the other?

The main differences Arthur – A series are as following:

	Arthur	A series
Input buffer/gain stage – gain	3 levels	2 levels
Input buffer/gain stage – topology	Composite	Standard
Input buffer/gain stage – regulators	Ultra-low noise	Standard
Input buffer/gain stage – PCB	4 layers	2 layers
Wake sources	Audiosense	Audiosense and 12V trigger
Switches and connectors	Neutrik, NKK, Schurter	Noname
Cooling concept	Conduction	Conduction and natural air convection
Chassis	Full aluminum with Nextel paint	Steel and aluminum

The Arthur design concept was to do our best for performance, reliability, build quality and aesthetics, then look at how much it costs. The A series had a price target that forced a few compromises. But is has a better cooling concept, so if your plan is to put the amp in a closed cabinet, the A 4216/E2 is for you.

 

[Matias]

It is a trade off between more power and cleaner high frequency response.

Technically yes, but according to their datasheets, under 10W and 4 ohms both are below audibible levels: < -120dB artifacts. And 10W in these high frequencies means that a ton of watts would be used on the other frequencies, as music content is like -40dB at near 20 kHz. So these below are "worst case practical scenarios" for treble distortion while listening to music in high SPL.

IMO I would say the more significant trade off is that NCx500 has +200W more power into 4 ohms, while the 1ET6525SA has -3.7W lower idle losses (heat like of an LED light bulb).

Purifi 1ET6525SA

Hypex NCx500OEM

 

[boXem]

Technically yes, but according to their datasheets, under 10W and 4 ohms both are below audibible levels: < -120dB artifacts. And 10W in these high frequencies means that a ton of watts would be used on the other frequencies, as music content is like -40dB at near 20 kHz. So these below are "worst case practical scenarios" for treble distortion while listening to music in high SPL.

IMO I would say the more significant trade off is that NCx500 has +200W more power into 4 ohms, while the 1ET6525SA has -3.7W lower idle losses (heat like of an LED light bulb).

Purifi 1ET6525SA
View attachment 469813

Hypex NCx500OEM
View attachment 469814

My usual response to this question is that the NCx500 is useful for people doing heavy handed room eq without subs. Others should choose the 1et6525sa that runs much cooler.
If one wonders how to differentiate the modules from measurement standpoint, the biggest difference is the THD+N vs power curve that is noise dominated (straight line) until clipping for Purifi while for Hypex modules (except Nilai) distortion dominates noise above a certain power. Small details too, like what looks like a bit of noise modulation for Hypex in the curves you showed.

 

[ninja1]

1. Mr Boxem: would you be so kind to explain why mostly Boxem use 6525 Purifi in Arthur and A series vs 7040, which is available only as Mono/double mono solution ?
Price, power supply , availability or ?

2. I know general (and my also) opinion about stereo vs 2 x mono or dual mono system, but would like to hear your opinion as well.

Thx in advance. Hope not asking to much...
BR

 

[boXem]

Newcomer in the A series: the A 2809/N4
4 channels 200 W in 4R, 2 gains levels, Hypex DSA254 based, ideal for surround and Atmos applications

 

[Fledermaus]

Paired with a 2-ch NCx500 and a nice 2x6 DSP box, this would also make for an affordable rack to power up serious DIY 3-ways...

 

[boXem]

Indeed, with the theoretical inconvenience that the cleanest amplification is used for bass duties. DSA254 is excellent but not as excellent as the NCx500.

 

[Fledermaus]

Aw, so all NCoreX-derived units are not equal... still might be excellent enough for those hesitant to spend the extra 900 € needed for a 4-ch Purifi - in any case, it's good to have the choice