CLASS D MONO AMPS buy ATMASPHERE MUSIC SYSTEMS


CLASS D AMPLIFIER TECHNOLOGY HAS FINALLY ARRIVED TO OUTPERFORM ALL OTHER TOPOLOGIES 

The Amplifier is the New Class D Mono Amps using GaN Fets in a unique Patented
Circlotronic output stage…Design by Ralph Karsten of ATMASPHERE MUSIC SYSTEMS 

Rated at 100 watts 8 ohms and 200 watts 4 ohms with low distortion across the full audio bandwidth with excellent noise characteristics 

I have been using ATMASPHERE MUSIC SYSTEMS MA-1 3.0 with all factory upgrades along with NOS 6NS7 Input Tubes for many years 

The New ATMASPHERE MUSIC SYSTEMS CLASS D has outperformed my MA-1 3.0 in all areas…the resolution and transparency are simply an Amazing Accomplishment

Also I sold my MP-3 mk 3.0 and purchased the New MP-3 mk3.3

In my Audio opinion I believe the ATMASPHERE MUSIC SYSTEMS CLASS D MONO AMPS used with the MP-3 mk3.3 will offer one of the most transparent sounding electronics combinations to date…only using the MP-1 mk3.3 will offer more performance 

I have used other High End Amplifiers in my system and the ATMASPHERE MUSIC SYSTEMS CLASS D MONO AMPS outperformed all of them as well

Music Lover…Audiophile…Retired Audio/Video Engineer over 45 years 

Thanks for Reading 

TubeGuy 45

tubeguy45

@kuribo If the maker of this amp provides similar measurements, we can make that assessment.

But Ralph specifically says that his amp does have 2nd and 3rd harmonics at some level..

If I’m interested in buying a car that is grey, I don’t even think to bother the dude who is selling a red car for details about it.  That’s just me. I can’t speak for we.

But if I did wish to ask about why the red car is so much better than a dull grey car, I would do so politely and with due respect for the red's superiority.

Here are the facts that Kuribo/ASR miss.

1. No amp has ever passed straight wire bypass testing.

2. All Purifi amps sound different.....based on their input stages, power supplies, wires used, connectors used, damping ,etc. etc.........yet, they will all measure about the same.....with all these different parts and execution.  So, if you can change and improve the sound of an amp without affecting its distortion measurements.....this actually proves that measurements by themselves are really not that important to really KNOWING what an amp sounds like.

3. No one who has listened to a bunch of serious amps has ever declared a Purifi based amp is the best amp in the world.

4. The Benchmark amp also measures like ASR people want.  It has its own sound (improved by using audiophile fuse in it) and again, no one would say it is state of the art that has listened to many high priced serious amps.  On Jay's thread right now there is a guy who just listened to 4 different amps and the Benchmark was not the best.

5. Discrete op amps do not generally measure quite as good as integrated circuit op amps.  VTV sells a version of their Purifi based amp that you can interchange various op amps on its input....including integrated circuit ones.  The discrete ones just plain sound better and each brand of discrete op amp sounds different from every other one.

6. Static standard distortion measurements do NOT tell you how transparent (like a striaght wire with gain) an amp is.  This fact alone does not resonate with measurement obsessed people.  The only way to know how transparent an amp is......is to listen to it.  Listening rules....measurements are just a mild indicator of something....nothing else.

Here is another factoid.  You cannot change anyones addiction by stating truth.  In order to stop your addiction, you have to admit you are addicted......the ego does not like to be WRONG.  I am sure Kuribo will fire back with his usual response.  We have played this game before.

The dance of truth versus ignorance is an eternal dance.  On every level there is truth......and on some level eveything is true.  So, hopefully, we can speak our truth in peace without making someone else wrong.  People are beautiful.....but sometimes we think and act out of alignment with our beauty.  This is called "being human"......However, we are also divine and can re-align with our beauty at any moment......we make the call.....every breath we take can be filled with joy or whatever else you choose.....choose wisely my friends.

The mind is a "make wrong machine"........the heart is a "make beautiful kissy thang"

I send you all big wet kisses.

Here are the facts that Kuribo/ASR miss.

Not a single fact, just more guru babbling not worthy of further consideration or comment.

But Ralph specifically says that his amp does have 2nd and 3rd harmonics at some level..

If I’m interested in buying a car that is grey, I don’t even think to bother the dude who is selling a red car for details about it. That’s just me. I can’t speak for we.

But if I did wish to ask about why the red car is so much better than a dull grey car, I would do so politely and with due respect for the red’s superiority.

"At some level"

What does that mean exactly? Nothing really.


If I’m interested in buying a car that is grey, I don’t even think to bother the dude who is selling a red car for details about it. That’s just me. I can’t speak for we.

Indeed, that is just you. If I am considering a $5000 amp, I would like to know a little more about it than the color. But that is just me, and probably the majority of people.

 

But if I did wish to ask about why the red car is so much better than a dull grey car, I would do so politely and with due respect for the red’s superiority.
 

Superiority? That has not been proven by any measure.

Thanks for the unsolicited advice.

 

There are many sources of distortion in class d amps, not only those you have mentioned, but also in the output filter. Do you use post filter feedback?

Yes.

Please share some measurements of the frequency response with load, THD+N with power and frequency, FFT's and IM. Also, can you share the switching frequency used? Lots of claims made here (not all by you) so it would be enlightening to see a more complete picture of how this amp performs in actuality, not how it sounds to those who haven’t heard it yet.

The frequency response is load invariant within 1/10db from 20-20KHz, with 0 degrees phase shift at 20Hz and less than 1 degree at 20KHz. The invariance due to the output impedance being a few milliOhms, the low phase shift due to the feedback value, which allows the amp to correct for phase shift at the bandwidth extremes.

THD from 20Hz- 20KHz  is < 0.1% at full power (200 W into 4 Ohms) and about 0.005% at 1 watt. We think it might be lower but finding a decent filter to knock out the residual has been tricky during the pandemic. We  found one about a week ago and are interested to see how things differ once its integrated into our test setup. The distortion is lower into 16 Ohms.

The switching frequency is just shy of 500KHz, depending on load. The input is entirely direct-coupled.

The filter I mentioned is an Audio Precision device and is used to knock out the residual to prevent it messing with the distortion analysis. If I got this right its 8th order(!) and puts the residual down about 60dB... This is why we've not posted any more distortion data since the residual throws the readings off.