Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier

[welwynnick]

0.1 dB is not noticeable in itself, but might affect the result of an AB comparison

Well in that case it's noticeable, isn't it?

 

[Julf]

Well in that case it's noticeable, isn't it?

In a black and white world, yes.

 

[restorer-john]

I'm always hearing that level matched AB comparisons have to be within +/-0.1dB of each-other, otherwise the difference in levels will dominate the audibility outcome.

I'd be more concerned with interchannel level differences being kept to <0.1dB if the test is being done on loudspeakers with stereo content.

 

[Julf]

I'd be more concerned with interchannel level differences being kept to <0.1dB if the test is being done on loudspeakers with stereo content.

Wouldn't moving your head 10 cm (or turning it slightly) cause a more significant difference?

 

[welwynnick]

I usually use a head clamp

 

[CT Man]

I usually use a head clamp

Hint: affixing memory foam to head clamps make them far more comfortable

 

[Reddoc]

Hint: affixing memory foam to head clamps make them far more comfortable

Improves audio recall as well

 

[Julf]

Hint: affixing memory foam to head clamps make them far more comfortable

But I forgot where I put my memory foam.

 

[goryu]

@Buckeye Amps

Do you have an internal photo of the amp to share?

 

[DonH56]

So which is it, then?
Is 0.1 dB barely noticeable, or is 3.0 dB barely noticeable?
You can't have it both ways.

When used for comparisons relative differences less than 1 dB are detectable. This is the case for things like DBT or ABX tests that switch between two sources while listeners attempt to discern any difference between signals. A very small increase in loudness is detectable and almost always deemed "better" since it is easier to hear. They point is that this small difference is detectable when one serves as a reference for comparison. If you have two sounds side-by-side and switch between them, 0.1 dB is the accepted threshold for level matching to avoid the louder being detected.

Without a reference, our ability to detect absolute levels is much less sensitive. In normal listening, without a reference level to compare, 1 dB is barely noticeable and 3 dB is about the step that seems "a little louder/softer".

I hate to resort to analogies, and vision is not my field, but I've read (and tested way back in college) that a similar thing happens with light sources. Side-by-side we can readily detect small variations in light output from two sources relative to each other, but if you put one bulb in then a little later swap it (or adjust a dimmer) for one of slightly more or less output and walk out and back into the room, it takes a much larger variation to be noticed in the absolute sense.

When testing loudspeakers, using just one speaker allows you to assess the speaker's performance in isolation without introducing all the variables of speaker matching, speaker and listener positioning, room effects, and so forth.

 

[Buckeye Amps]

@Buckeye Amps

Do you have an internal photo of the amp to share?

First post. Even though that was a picture of the prototype build, it is essentially how the final build looks. Will take a picture of the Micro Audio before shipping out your order once the next batch of cases arrive this week

 

[DonH56]

@Buckeye Amps

Do you have an internal photo of the amp to share?

Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier

Announcing our new Purifi 2nd generation EIGENTAKT 1ET9040BA Monoblock amplifier! Purifi 1ET9040BA Power Specs (1kHz, THD = 0.1%): - 375w @ 8ohm (peak) - 750w @ 4ohm (peak) - 1400w @ 2ohm (peak) 40A output current Custom Input Board: Neutrik XLR connectors Gold plated 5-way speaker binding...

www.audiosciencereview.com

 

[goryu]

First post. Even though that was a picture of the prototype build, it is essentially how the final build looks. Will take a picture of the Micro Audio before shipping out your order once the next batch of cases arrive this week

Might want to add one to the product page on your web site. Thanks.

 

[Buckeye Amps]

Might want to add one to the product page on your web site. Thanks.

I will once I have a new picture. Thanks!

 

[Kal Rubinson]

I hate to resort to analogies, and vision is not my field, but I've read (and tested way back in college) that a similar thing happens with light sources. Side-by-side we can readily detect small variations in light output from two sources relative to each other, but if you put one bulb in then a little later swap it (or adjust a dimmer) for one of slightly more or less output and walk out and back into the room, it takes a much larger variation to be noticed in the absolute sense.

In general, one can think of our brains being very good at contrast (or edge) detection in most of the senses and less descerning in identifying absolute magnitudes. Thus, with A/B audible comparisons and side-by-side visual comparisons, one can detect finer gradations than with spaced or independent presentations of the same stimuli.

 

[DonH56]

In general, one can think of our brains being very good at contrast (or edge) detection in most of the senses and less descerning in identifying absolute magnitudes. Thus, with A/B audible comparisons and side-by-side visual comparisons, one can detect finer gradations than with spaced or independent presentations of the same stimuli.

Thanks Kal, appreciate the insight from an expert!

 

[Descartes]

In general, one can think of our brains being very good at contrast (or edge) detection in most of the senses and less descerning in identifying absolute magnitudes. Thus, with A/B audible comparisons and side-by-side visual comparisons, one can detect finer gradations than with spaced or independent presentations of the same stimuli.

Well said Doctor Rubinson!

 

[CLT]

Anyone, who already got their 1ET9040 builds care to share how do they sound, please? Any differences/similarities with 1ET400?
Thank you!

noiseless, the amps sound great. I couldn't be more pleased coming from Class A monoblocks.
It's all up to your upstream components now and recording. Played some CDs that sounded horrible and some sounded sublime.
Streaming sounds great, vinyl even better than before for some reason.
I have no way to compare to the 1ET400.

Nice work Dylan!

 

[shion_ca]

noiseless, the amps sound great. I couldn't be more pleased coming from Class A monoblocks.
It's all up to your upstream components now and recording. Played some CDs that sounded horrible and some sounded sublime.
Streaming sounds great, vinyl even better than before for some reason.
I have no way to compare to the 1ET400.

Nice work Dylan!

Compared to the class A’s do you notice a difference sonically? What brand of class A did you have?

 

[CLT]

Monarchy SM-70 pro.
Not really. If I could describe it in one word it would be better presence. Maybe grip as others have said. The Buckeye monos are very nice, very happy.
Contrary to many who believe they don't need a break in period, I believe it. I've just left them on for past week + and they "seem" to have gotten better out of the box.