Review and Measurements of Purifi 1ET400A Amplifier

[rebbiputzmaker]

I think "sub optimal" covers it Those inductors right next to the amp module.

Shielding won't help, the switching signals are floating around and conducted and radiated through that wiring anyway.

The psu bolted to the chassis should be adequate heatsinking.

How do you shield the power supply from the amplifier on the all in one Hypex boards?

 

[rebbiputzmaker]

Then that confirms he doesnt have adequate electronics understanding. This is a very well known issue.

The chassis doesnt appear to be connected to mains safety earth as there is no wire on the connector dedicated for that purpose. I dont see bolts holding the IEC receptical to the chassis, so I dont see a connection there, but this could be the case. Looks like a push in job.


View attachment 59644

If the IEC is tightly pushed into the case, how would the connectivity differ from a push on terminal that is used in wiring the amplifier? They both make friction contact.

 

[jae]

Is there a DIY chassis (or plate for ghent audio case) made specifically for this?

 

[Hemi-Demon]

These Purifi, NCORE, and Hypex modules are so powerful, small and efficient, it just makes me wonder if there is any way I could fabricate a 12V power supply to run these in a car environment. The lack of generated heat and overall clean output would be better than any car amplifier I have ever used. Any idea on what it would take, if at all possible?

 

[Matias]

These Purifi, NCORE, and Hypex modules are so powerful, small and efficient, it just makes me wonder if there is any way I could fabricate a 12V power supply to run these in a car environment. The lack of generated heat and overall clean output would be better than any car amplifier I have ever used. Any idea on what it would take, if at all possible?

Or just use a class D car amplifier like the Alpine below.
https://www.audiosciencereview.com/...d-600-1d-nano-car-amplifier.11521/post-330869

 

[zeb512]

Sorry if it is a dumb question but I'm wondering if this module can be used with small speaker rated like this:
Recommended amplifier: 30 - 80 W
Sensitivity: 90 dB / 1W / 1m
Impedance: 6 Ohms

The goal would be to replace internal amp from a Yamaha DSP-Z7.. any gain regarding SQ ?
My reasoning is to invest in a good power module and change later other components.

Any advice welcome

 

[boXem]

Sorry if it is a dumb question but I'm wondering if this module can be used with small speaker rated like this:
Recommended amplifier: 30 - 80 W
Sensitivity: 90 dB / 1W / 1m
Impedance: 6 Ohms

The goal would be to replace internal amp from a Yamaha DSP-Z7.. any gain regarding SQ ?
My reasoning is to invest in a good power module and change later other components.

Any advice welcome

7 channels, 7 modules.
Do you have a raw idea of the feasibility of the thing?

 

[zeb512]

7 channels, 7 modules.
Do you have a raw idea of the feasibility of the thing?

No This is why I'm asking.
My end of the day setup would be:
- PC with TV / Movie / Music
- dac8 pro
- Purifi 1ET400A
I dont know if it's a good idea or not this is why I'm asking.
For the power module I would like to start with 2 or 4 of them (L R or L R C) then later two more.

 

[boXem]

No This is why I'm asking.
My end of the day setup would be:
- PC with TV / Movie / Music
- dac8 pro
- Purifi 1ET400A
I dont know if it's a good idea or not this is why I'm asking.
For the power module I would like to start with 2 or 4 of them (L R or L R C) then later two more.

Then what are you doing with the Yamaha?
I may suggest two things: look at the cost of the modules, and browse through the Purifi diy thread https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/

 

[zeb512]

Then what are you doing with the Yamaha?
I may suggest two things: look at the cost of the modules, and browse through the Purifi diy thread https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/

Today I've more stuff plugged in (Shield / DVD player / TV Box / Raspberry with DAC for audio)
Thanks for the link.

 

[slingshot]

Does anyone know about this U.S company that is now selling Purifi amps. Price is very reasonable and you don't have to ship it overseas if it breaks, Been there, done that.

https://vtvamplifier.com/product/vtv-amplifier-stereo-purifi-audio-1et400a-amplifier/

 

[Matias]

Does anyone know about this U.S company that is now selling Purifi amps. Price is very reasonable and you don't have to ship it overseas if it breaks, Been there, done that.

https://vtvamplifier.com/product/vtv-amplifier-stereo-purifi-audio-1et400a-amplifier/

https://www.audiosciencereview.com/...core-nc252mp-its-all-amirs-fault.13195/unread

 

[Vincentponcet]

No This is why I'm asking.
My end of the day setup would be:
- PC with TV / Movie / Music
- dac8 pro
- Purifi 1ET400A
I dont know if it's a good idea or not this is why I'm asking.
For the power module I would like to start with 2 or 4 of them (L R or L R C) then later two more.

I'm looking for exactly the same in 5.1
I just received a DAC8Pro
It looks like custom input buffer provides nothing except more cost compared to the EVAL-1 ( Tell me if I'm wrong, I'm just discovering the topic).
hifi2000 has cases of 165mm height, in which you could out EVAL1 stereo module as vertical, to put several modules.
If I put 3 stereo modules, that's enough for my 5.1 (I do not need the .1, sub is powered).
Using an Hypex 3kW module, that's enough for 6 modules (and knowing that I will use 5 anyway).
one case and one power supply would make it significantly cheaper than using stereo amps.
That would be my dream amp.

By the way, how would you manage TV / Movie / music in the PC ?

 

[digitalfrost]

NAD sells a 7 channel power amplifier: https://www.audiosciencereview.com/...iew-and-measurements-of-nad-m27-pwr-amp.9036/

I find it quite cheap for the quality and number of modules.

 

[Vincentponcet]

NAD sells a 7 channel power amplifier: https://www.audiosciencereview.com/...iew-and-measurements-of-nad-m27-pwr-amp.9036/

I find it quite cheap for the quality and number of modules.

Great price for performance, but it is an NC400.
SINADs are close : 101 vs 104, but third harmonic performance is significantly better, -130db for Purifi against - 108db for NAD M27
It is possible that NAD will provide a Purifi based 7 channels amp at some point, as they are already doing a stereo amp (Nad M33).

 

[Zoomer]

Or this, fully customizable and even "cheaper" no Purifi, but good old Hypex.

 

[zeb512]

I'm looking for exactly the same in 5.1
I just received a DAC8Pro
It looks like custom input buffer provides nothing except more cost compared to the EVAL-1 ( Tell me if I'm wrong, I'm just discovering the topic).
hifi2000 has cases of 165mm height, in which you could out EVAL1 stereo module as vertical, to put several modules.
If I put 3 stereo modules, that's enough for my 5.1 (I do not need the .1, sub is powered).
Using an Hypex 3kW module, that's enough for 6 modules (and knowing that I will use 5 anyway).
one case and one power supply would make it significantly cheaper than using stereo amps.
That would be my dream amp.

By the way, how would you manage TV / Movie / music in the PC ?

Maybe another way that can reuse some component I have (Shield TV / HD Vertex).
I dont know if shield will work with minidsp.. and how to process audio correctly on the PC (direct 7.1 to 5.1 or 2.1 for Roon).
That's the idea... if someone can comment on possible issue it will help.

 

[Vincentponcet]

Maybe another way that can reuse some component I have (Shield TV / HD Vertex).
I dont know if shield will work with minidsp.. and how to process audio correctly on the PC (direct 7.1 to 5.1 or 2.1 for Roon).
That's the idea... if someone can comment on possible issue it will help.

I don't think NVIDIA Shield support multi channel USB DACs. It will most probably use only 2 channels.

 

[zeb512]

I don't think NVIDIA Shield support multi channel USB DACs. It will most probably use only 2 channels.

It seems to have it, you have a setting for that and I've trried to plug 7.1 USB headphone to test it. It works but i'm not 100% sure it output 7.1 PCM audio. It also seems to have been broken: https://piunikaweb.com/2019/11/19/n...ssue-acknowledged-by-company-fix-coming-soon/

 

[Vincentponcet]

It seems to have it, you have a setting for that and I've trried to plug 7.1 USB headphone to test it. It works but i'm not 100% sure it output 7.1 PCM audio. It also seems to have been broken: https://piunikaweb.com/2019/11/19/n...ssue-acknowledged-by-company-fix-coming-soon/

woo, this was 6 months ago, and no fix yet.
and it looks like updates can break things for many months.
So it is not a reliable device to put at the center of your system.