Buckeye Purifi Eigentakt 1ET9040BA monoblock power amplifier Stereophile Measurements

[Multicore]

Just noticed this bit - this is total nonsense and a great example of how nuts this thread has become.

It's funny, isn't it? All the aghast posturing moved from the FTC thread to here. Recreational outrage isn't just our era's favorite pastime, it's big business too (though not specifically here at ASR afaik).

 

[ebslo]

Call the cops!

Just noticed this bit - this is total nonsense and a great example of how nuts this thread has become.

I think it was just a typo, I assumed they meant "fraught".

 

[rdenney]

Power rating standards promote transparency by curbing exaggerated claims, such as emphasizing high outputs during short 20 ms bursts or any other metric used to suggest "making the music louder." -Does it actually make my music louder?

It is really just a rating.
Companies can publish any ratings they like alongside the FTC rating, including their preferred "music power" ratings if they choose. Remember PMPO?
The key point here is that if all manufacturers use this one measurement (the FTC rating), it allows for straightforward comparisons among them, similar to how SINAD works. Does it give you all the information you need for your specific use case? Not necessarily, but it does serve as a performance indicator, much like the SINAD value.

If you need or want to, you can always dive into the spec sheet for more details, which may reveal metrics that are better suited for your specific needs.

IMO.

Come on, Brad, any rating that is required by some government regulation to be the dominantly displayed single descriptor of fitness for purpose should define that purpose the way common consumers would, not the way audio geeks testing with signals not used by even a tenth of a percent of common users would play or care about. Audio geeks can get what they need from real testing and don’t need a nanny. Regular consumers want to know if their audio streams of music and movie soundtracks will be louder. This is not hard to model and your attempts to make it hard belie an underlying agenda that it is not and should not be government’s job to enforce.

Rick “you know this” Denney

 

[pma]

Could we stop debating FTC in this thread?! The thread topic is

Buckeye Purifi Eigentakt 1ET9040BA monoblock power amplifier Stereophile Measurements​

so let's see what the new sample results would look like. Otherwise the FTC trolling would lead to closure even of this thread! It seems it is a destiny of every thread to be dissolved in off topic debates.

 

[AdamG]

Could we stop debating FTC in this thread?! The thread topic is

Buckeye Purifi Eigentakt 1ET9040BA monoblock power amplifier Stereophile Measurements​

so let's see what the new sample results would look like. Otherwise the FTC trolling would lead to closure even of this thread! It seems it is a destiny of every thread to be dissolved in off topic debates.

What he said ^^^. No more off topic discussion. Create a new thread and knock yourself out.

Thank you for your cooperation and support.

 

[Sokel]

Could we stop debating FTC in this thread?! The thread topic is

Buckeye Purifi Eigentakt 1ET9040BA monoblock power amplifier Stereophile Measurements​

so let's see what the new sample results would look like. Otherwise the FTC trolling would lead to closure even of this thread! It seems it is a destiny of every thread to be dissolved in off topic debates.

I believe that will be April?

 

[tmtomh]

I think it was just a typo, I assumed they meant "fraught".

Ah - that would make a lot more sense - thanks!

 

[AdamG]

Ah - that would make a lot more sense - thanks!

We are leaving this behind now. Please and thank you.

 

[David_M]

Does anyone know why Purifi recommends the Hypex 1200W power supply, knowing it cannot provide the full rated power of 1400W into 2 ohms of the 9040BA module? With this Hypex power supply, the 9040 is able to deliver a maximum of 1050W to 1100W into 2 ohms. Why not recommend another one, like the Microaudio 1500W PS, able to deliver the spec'd 1400W?

Does Purifi have some form of a contractual relationship with Hypex to only use their power supplies, maybe due to the former history of the design engineers with Hypex?

 

[Buckeye Amps]

Does anyone know why Purifi recommends the Hypex 1200W power supply, knowing it cannot provide the full rated power of 1400W into 2 ohms of the 9040BA module? With this Hypex power supply, the 9040 is able to deliver a maximum of 1050W to 1100W into 2 ohms. Why not recommend another one, like the Microaudio 1500W PS, able to deliver the spec'd 1400W?

Does Purifi have some form of a contractual relationship with Hypex to only use their power supplies, maybe due to the former history of the design engineers with Hypex?

Unless I'm missing something somewhere, I have not seen them directly endorse/recommend Hypex SMPS'

 

[Holmz]

Does anyone know why Purifi recommends the Hypex 1200W power supply, knowing it cannot provide the full rated power of 1400W into 2 ohms of the 9040BA module? With this Hypex power supply, the 9040 is able to deliver a maximum of 1050W to 1100W into 2 ohms. Why not recommend another one, like the Microaudio 1500W PS, able to deliver the spec'd 1400W?

Does Purifi have some form of a contractual relationship with Hypex to only use their power supplies, maybe due to the former history of the design engineers with Hypex?

Do you realise how stupidly high a 1KW of power is in terms of damaging SPL?

 

[Doodski]

Do you realise how stupidly high a 1KW of power is in terms of damaging SPL?

I calc'd it and it's very high SPL.

 

[Randyman...]

Do you realise how stupidly high a 1KW of power is in terms of damaging SPL?

Why even market a 1.4KW amp then?

And 113dB is not THAT loud IMNSHO (I'm a drummer BTW )...

 

[Doodski]

Why even market a 1.4Kw amp then?

And 113dB is not THAT loud IMNSHO (I'm a drummer BTW )...

For large rooms, dynamic transients with inefficient speakers and because of wanting the biggest on the block.

 

[Randyman...]

For large rooms, dynamic transients with inefficient speakers and because of wanting the biggest on the block.

I love my many multi-KW systems for sure

 

[Hayabusa]

I'd put the 8 ohm knee at around 330 watts:

View attachment 420069

Just because the decision is not entirely cut-and-dried - you could put it at 200 where the THD starts to noticeably increase again, or as you say you could put it at 400 where the curve becomes basically veritcal - does not mean the decision is arbitrary. It's very clear where the THD suddenly and rapidly increases.

What about looking at the timedomain signal itself and measure clipping by looking at the peak value and compare that to the rms value.
If that differs by 'some' margin from sqrt(2) take that as max output.

 

[Fahzz]

Stop replying everyone so @Buckeye Amps will stop reading and get my amp to me

He's watching football.

 

[pogo]

I calc'd it and it's very high SPL.

You should use a more realistic calculator. Here is just one example:

For program material with a CF = 20 it would be 1.8kW
And this consideration does not even take into account a room correction such as Dirac Live, which may also compensate for sinks!

 

[Doodski]

You should use a more realistic calculator. Here is just one example:
View attachment 420204

For program material with a CF = 20 it would be 1.8kW
And this consideration does not even take into account a room correction such as Dirac Live, which may also compensate for sinks!

Sure if you link me I'll add it to my bookmarks folder of calculators.

 

[Old_School_Brad]

Do you realise how stupidly high a 1KW of power is in terms of damaging SPL?

You can't simply determine that 1000 watts is loud.
Besides, that's not the main point.

Spoiler: Calculation