boXem A series

[boXem]

A custom installer - customer of us - was searching for an amplification solution able to deliver 1kW into 8 Ohm.

Here enter the A 5519/N2 and A 5519/N4 bridged using an Y cable (phases are already internally inverted):

 

[boXem]

Finally took the time to run some measurements on the production boards. Quite happy with the result.
High gain has a sensitivity of 2V, measured SINAD 5W 4R at 107.6 dB
Low gain has a sensitivity of 4V, measured SINAD 5W 4R at 109.2 dB
So better than competition at equivalent gain if memory serves.
@Matias do you need other data for your table?

 

[Matias]

Power at 1% THD+N 4 ohms, and price.

 

[boXem]

It is the 2 channels {interface board + 2 NCx500} used in the A 5517/N2 - A 5519/N2 - A 5519/N3 - A 5519/N4 and A 5519/N5. Measurement was made on a A 5519/N2.

 

[boXem]

Purifi modules make their entrance in the boXem A series with 2 new amps:
- the boXem A 4222/E1 monoblock
- the boXem A 4222/E2M dual mono
Both are based on the Purifi 1ET7040SA and can be immediately ordered with 2 weeks manufacturing delay.

 

[zdykstra]

Purifi modules make their entrance in the boXem A series with 2 new amps:
- the boXem A 4222/E1 monoblock
- the boXem A 4222/E2M dual mono
Both are based on the Purifi 1ET7040SA and can be immediately ordered with 2 weeks manufacturing delay.

On the `Product Details` tab for both of those links, the Power stage(s) and Power supply rows reference Hypex related values. There are also references to A5519 on the Description page.

Are the Arthur amps coming back in stock, or are they being phased out? The site no longer has a currency selector (that I can find) - are sales to US customers still available?

 

[boXem]

On the `Product Details` tab for both of those links, the Power stage(s) and Power supply rows reference Hypex related values. There are also references to A5519 on the Description page.

Are the Arthur amps coming back in stock, or are they being phased out? The site no longer has a currency selector (that I can find) - are sales to US customers still available?

Thanks for spotting these mistake. They are corrected now. The currency selector is back.
Arthur will be back end of May with some minor external changes (slightly modernized front plate with the new logo) and more important internal ones. Can't say more at the moment.

 

[vicenzo_del_paris]

A Boxem "A" 5517/N2 (ncx500) just replaced an Boxem Arthur 3409/N2 (nc252mp) !

In the end, I ended with a Boxem A 5519/N3 to simplify my 3.2 setup.

Very pleased once again with Boxem amps !

What is impressing with these ncx500 modules, it is how loud they could go.

Tried to play some music to insane volume (-5db, high gain with 2v input) on my Focal Kanta 2, while being indeed too loud for the room, the Kantas kept up with the power and produced extremely clean sound

Little side notes:
- the trigger wakes up the amplifier but does not switch it off. The amplifier goes in standby after 10 mns without signal (same as the auto sense feature).
- 3 ncx500 modules + SMPS3k indeed draw more watts when idling compared to my previous Arthur 3409 based on nc252mp.

To summarize, happy Boxem customer here

 

[vicenzo_del_paris]

Yes, Boxem is great! How many watts did you measure for the Boxem A 5519/N3 while idle? Did you use Kill-a-watt?
Does the chassis get warm to the touch after an hour of playing at normal volumes?
Thank you!

I have a smart plug with live wattage stats.
With the 5519/N3 it is about approx. 20w more than with previous Boxem 3409 (nc252mp).

I have to check with just the amp on the plug as currently I am many devices on that plug.

From hypex spec, it should be about 16w difference:
NC252MP : 15.5w -> 8.5 (smps) + 2x 3.5 (modules)
5519/N3 : 31.5w -> 15 (smps) + 3x 5.5 (modules)

 

[vicenzo_del_paris]

@amper42 about the chassis temperature, the top of the new A series line chassis will feel warmer than other Boxem products by design, as smps and modules are mounted on top instead being mounted on the bottom.
After a long running session, it is slightly warm but still way less than an AVR for example.
I don't have a way to measure it but the thermal design seems working very well . I am quite pretty sure that the module internal temperature is much less. It will be interesting to test it.

For example, I kept the 5517/N2 just one day. After my first listening session, the top was warmer than what I was used to with the Arthur 3409. But the bottom was completely cold.
Waiting for the 5519/N3, I used the Arthur. Following a similar session, the top was less warm but the bottom was as warm as the 5517/N2 while idle loss of 5517 is greater.

 

[Deleted member 68495]

Hi everyone:
Considering the overall great reception Boxem has had in ASR I would like to buy a Boxem stereo amp but have some questions...
1- Is the Arthur model the cheapest one?
2-What is the difference between the Boxem A 5517/N2 and the 5519/N2?
3-Any considerable difference between Purifi and Hypex NCX500 for a listening distance of max. 3 meters, max.SPL 90dB and a pair of speakers with 85dB/6Ω? Speaker recommended amplification is 30W-120W (though based on what I have read here so far it looks like recom.amplification is not relevant)

If anyone could give me a bit of information regarding these topics I would be very thankful, cheers!

 

[vicenzo_del_paris]

Hi everyone:
Considering the overall great reception Boxem has had in ASR I would like to buy a Boxem stereo amp but have some questions...
1- Is the Arthur model the cheapest one?
2-What is the difference between the Boxem A 5517/N2 and the 5519/N2?
3-Any considerable difference between Purifi and Hypex NCX500 for a listening distance of max. 3 meters, max.SPL 90dB and a pair of speakers with 85dB/6Ω? Speaker recommended amplification is 30W-120W (though based on what I have read here so far it looks like recom.amplification is not relevant)

If anyone could give me a bit of information regarding these topics I would be very thankful, cheers!

Currently, Arthur lineup is based on Purify and Series A lineup on hypex ncx500.

5517/N2 is small casing with smps1200.
5519/N2 is large casing with smps3000.

Serie A (hypex) consumes more power when idling compare to Arthur ones (purify).

From your description, ncx500 (power advantage) seems to not have any advantages over purify (consumption advantage). Thus Arthur lineup, based on purify seems to be a better choice.

And Arthur casing feels more "highend" than series A (taste aside).

 

[Deleted member 68495]

Currently, Arthur lineup is based on Purify and Series A lineup on hypex ncx500.

5517/N2 is small casing with smps1200.
5519/N2 is large casing with smps3000.

Serie A (hypex) consumes more power when idling compare to Arthur ones (purify).

From your description, ncx500 (power advantage) seems to not have any advantages over purify (consumption advantage). Thus Arthur lineup, based on purify seems to be a better choice.

And Arthur casing feels more "highend" than series A (taste aside).

Hey thank you very much for taking the time, that's nice of you!

 

[boXem]

Hi everyone:
Considering the overall great reception Boxem has had in ASR I would like to buy a Boxem stereo amp but have some questions...
1- Is the Arthur model the cheapest one?

The A series are supposed to be the cheapest ones. Not for a Hypex vs Purifi reason but mainly due to their cheaper case and shorter assembly time (less cables).

2-What is the difference between the Boxem A 5517/N2 and the 5519/N2?
3-Any considerable difference between Purifi and Hypex NCX500 for a listening distance of max. 3 meters, max.SPL 90dB and a pair of speakers with 85dB/6Ω? Speaker recommended amplification is 30W-120W (though based on what I have read here so far it looks like recom.amplification is not relevant)

If anyone could give me a bit of information regarding these topics I would be very thankful, cheers!

@vicenzo_del_paris already perfectly replied

 

[boXem]

And here we go for 2 to 5 channels amplifiers with Purifi 1ET400A power stage:
- stereo A 4215/E2 1160 €
- 3 channels A 4215/E3 1620 €
- 4 channels A 4215/E4 1920 €
- 5 channels A 1215/E5 2260 €

The stereo version can be shipped within 2 weeks, the others will ship mid July

 

[tmocke]

Whats means "Binding posts"?
The black ones as seen in pictures?

 

[boXem]

Whats means "Binding posts"?
The black ones as seen in pictures?
View attachment 373538

Sorry, didn't have time to take pictures with them installed, and using the picture with the WBT-708 binding posts would have been misleading.

 

[tgray]

Just wanted to say I've been using my A series (4215/E2) for a month now and it is great! While it's nice to have a trigger, the audio sense is soooooo good, I don't even use the trigger.

 

[boXem]

Winning the price of the shortest product lifespan: the A 4215/Ex series!

The idea was to replace the 1ET400A by the 1ET6525SA and keep going, but we finally decided that the little power boost in 2R was big enough to be worth a product rename.

So, say welcome to the
- stereo A 4216/E2 1210 €
- 3 channels A 4216/E3 1690 €
- 4 channels A 4216/E4 2025 €
- 5 channels A 4216/E5 2390 €

Availability from mid October.

 

[boXem]

1. Images updated, thanks!
3. The Purifi modules do not need the top down cooling, but A series cases are also used with Hypex modules that really benefit from this. The power supply runs a bit cooler in this case than in the Arthur one.
4. The Arthur 4216/E2 with 1ET6525SA will appear in a very short time.
5. The short lived A 4215/E2 already had an OPA1612. This board is highly configurable and supports both Hypex and Purifi modules. The Arthur 4215/E2 that you own has an OPA1656. The OPA1656 allows and higher input impedance without generating too much DC. But it's noisier than the OPA1612. A series input impedance is 10k, Arthur input impedance is 94k. 10k is perfectly OK with whatever opamp, but a bit low for passive attenuators, tubes, minimalistic discrete output stages, ...
6. 0.9 dB doesn't make a perceptible difference in volume control