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2nd generation EIGENTAKT PURIFI 1ET6525SA (successor to the 1ET400A)

I'll get around to actually installing it at the end of this week or when I get some time as I have to travel out of town on business. The amp itself looks like a good solid build, the only negatives I can give on initial observation is that there is no LED on the front panel indicating the unit is on and there is no master on/off switch. This wouldn't be a problem if the venting were at the top where I could observe the Purifi module LEDs come on.

Can I purchase the new heatsink from you when you've cleared out your initial orders and install it myself and is there an on-line users manual for the A 4216 units?

Both Fred at boXem and Dylan at Buckeye Amps have been pleasure to deal with and have answered all questions. I wouldn't hesitate to purchase from either of them.
 
rsg said:
I'll get around to actually installing it at the end of this week or when I get some time as I have to travel out of town on business. The amp itself looks like a good solid build, the only negatives I can give on initial observation is that there is no LED on the front panel indicating the unit is on and there is no master on/off switch. This wouldn't be a problem if the venting were at the top where I could observe the Purifi module LEDs come on.

Can I purchase the new heatsink from you when you've cleared out your initial orders and install it myself and is there an on-line users manual for the A 4216 units?
Click to expand...
No front LED is a design choice. Manual is in the ToDo list. Maybe we can take this conversation in the boXem A seies thread ;) .
 
amper42 said:
The sweet spot for minimal heat is two Purifi modules (Stereo) and a standard Hypex SMPS1200 power supply. Once you start using the same case to house four modules and a SMPS3K the challenge to maintain a cool operation is significantly magnified. Purifi stereo amp configurations run cooler by design.
Click to expand...
I don't think it's a difficult design challenge. It comes down to case size, heat sink capacity and proper ventilation. I saw one DIY amp here on ASR that had 3/8" thick copper plates on each of 8 modules, two case fans, two PSs and a large chassis. It looked like a really nice build.
 
Well, I am hoping that you guys are not considering the temps measured by @rsg as "too high". Because they are frankly reasonable.
Engineering is meeting or exceeding a set of performance targets while meeting or being under a target cost. Getting the best performance at whatever cost is called a hobby. Nothing against it, but that is not how a company is run.
Heat spreader had to be modified due to manufacturing issues and solving these issues improved air flow as a nice side effect.
 
Honest specifications is also called a hobby? What would be the rated power tested by a 5 minutes continuous sine test at 1kHz into 4 ohm and 8 ohm, all channels driven?
 
pma said:
Honest specifications is also called a hobby? What would be the rated power tested by a 5 minutes continuous sine test at 1kHz into 4 ohm and 8 ohm, all channels driven?
Click to expand...
No idea, we are selling electric sound amplifiers, not soldering stations. Our amps are able to withstand (no shutdown for whatever reason) CTA-2034 pink noise at clipping onset for 30 minutes, all channels driven.
 
The temperatures are very reasonable. I want to stress again the measurements are on the surface of each module & PS. The case itself is quite cool. In comparison, the case of multi-channel HT audio-video processors get hotter. The reason for my measurements are not to denigrate any manufacturer, but to plan putting equipment into an enclosed cabinet with adequate airflow.

Having used high powered class AB amps for the last 25 years, I’m quite pleased with both the Purifi & Hypex modules.
 
amper42 said:
That's a bit of an oxymoron.
It's difficult to supply "adequate airflow" without an opening in the cabinet and maybe a quiet fan of some type.
No other electronics in a cabinet helps but it's unusual as people end up stacking components with little room for circulation.
Closed spaces by their very nature imped airflow and allow heat build.

We spray foamed the attic this year with 6.5" of foam on all Truss/rafters and down side walls. Next, we removed the 10" of insulation above the ceiling. The attic space is now within 3 degrees of the temperature in the house.
It's 48F outside and 77F inside right now with no heating equipment in use.
We open windows during the day to enjoy fresh air.
A sealed enclosure will be much like that but on a smaller scale and the amp provides a heat source.
Click to expand...
Fans will be used and an opening is available. The cabinet is a Salamander Synergy Systems with ventilated front door. Generally I allow for 6-8” above amps & processors. Fans are from AC Infinity.
 
Is there any reason sound quality wise to use 1ET9040BA instead of 1ET6525SA? This seems like the deal of the century if Im reading the specs correctly.
 
jamesdyson said:
I don't see a reason to doubt the power numbers. I have done a lot of research on these competing amps and the March power data is consistent with what's in the datasheet. They just don't have an undervoltage Hypex PSU. This is measured data not module spec. Still waiting to see more comprehensive measurement data from other manufacturers.
I ordered a March Audio P482 yesterday. It's shipping from stock so no delay from build time. Should have it in the UK by next Monday. I considered the things you mention and have no reason to doubt March and trust they will offer excellent service. 5 year standard warranty. Looks? Well personally I dont want cheap bent sheet for a case. Anything better is similarly priced. So far had excellent comms by email and on their forum. I like the extra attention to detail which provides the best performance. I will let you know how I get on.
Click to expand...
@jamesdyson I was wondering if you've received your P482 from March Audio yet? Hopefully my P482 & P481 amps will be with me soon, hopefully tomorrow. :)
 
amper42 said:
...
No other electronics in a cabinet helps but it's unusual as people end up stacking components with little room for circulation.
Closed spaces by their very nature imped airflow and allow heat build.
...
Click to expand...

I wonder if there is a cultural.geography aspect to that?

With flat screen TVs, I have often read in Europe it is more prevalent to have TVs on a media table, and in the US the wall mounting (often mounted waaaay too high) is far more prevalent.

I have never once in my life put hifi gear in a closed cabinet, personally. And my TV sits on a low media table too (and my minimalist setup shows openly there, too).
 
pma said:
Honest specifications is also called a hobby? What would be the rated power tested by a 5 minutes continuous sine test at 1kHz into 4 ohm and 8 ohm, all channels driven?
Click to expand...
May be honest in some ways, but how useful would that be, would it shorten the amp's life somewhat (if not then I'd for it but if to pass such test it would cost more to make, then would most people be willing to pay for it? I suspect most here on ASR use their amps to listen to music, movie/video sound tracks lol...
 
Can anyone tell me whether the 1ET6525SA design has already been implemented here?: Link
The 510 W @2 Ohm would speak for it.
The bridge-mode has more output power @4 ohms than a 1ET9040BA!
The same has already been seen with an MXA-8400 and M23/M33.
 
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