Atma-Sphere Class D… Amazing

We have Kuribo claiming that only measurements are meaningful and since Hypex and Purifi have the best measurements then they are the best. Then you have Ralph saying it is ONLY certain measurements that are meaningful for sound and his amp has those measurements. Neither one of these people claim that parts and tweak execution are necesarry or important.

Please go to 10 audio.com and read the reviews of the Purifi based amps from NAD and the EVS modified VTV $1000 amp. They both use the same exact module from Purifi......I do some minor mods to the Purifi module.....but it would not measure any different. He describes the sound difference.......quite a bit better with my modded Purifi than the stock implemented NAD. BTW, I am no longer modding amplifiers.....so this is not an advertisement. In fact, you will see all references to modding removed from my website this weekend (I am sure the anti modders are celebrating....he he)

Measurements are great......I think it is better to have lower measured distortion and probably Ralph is correct about the types of distortion. But.....a BIG BUT.......this is just the beginning. I can take any amplifier of any type.....class A, Class A/B, class D.....solid state or tubes and improve the sound in infinite ways that have NOTHING To do with the distortion measurements. I have been doing this for over 40 years. People have sent me their stock digital disc players, DACs, etc. and I have done mods on them and returned them and ALL of them over the years say they now have better sound. It is universal.

If you really want to KNOW anything about what I am saying.....then simply try the transformer mod ON ANY product you have that has a toroidal transformer bolted down with steel hardware. Do you want to be right?.....or do you want to learn something? Do you want the sound you have now or do you want better sound? It will take 20 minutes to take the covers off....remove the steel and place the transformer on a three inch sqaure piece of one quarter inch thick wood. You can even temporarlily use two stacked double thick cardboard pieces Even if you just lay the transfomer down on the chassis the sound would be improved......but it sounds best by getting the transformer away from the grounded chassis.

You could also try an audiophile fuse....(the $200 Quantum yellow for instance). Does it improve the sound.....or will it do nothing as Ralph and Kuribo claim?......Who do you believe? I believe no one. I try things for myself. Do not believe me, do not believe Kuribo, do not believe Ralph......believe what you experience/what you hear. DIRECT experience tells you what is true.....words are just words.....opinions are just opinions.....truth can be known by direct experience only. Are you in LOVE? Do you need someones opinion to know you are in love? Do you need someones opinion to know what something sounds like? I hope not. Be your own Guru.....be your own source of knowledge......A wise man has direct knowledge.....he does not follow others..

We are the infinite light, love, joy and peace of God.....We are also wise and powerful....especially when we let spirit guide our ways of thinking and saying and feeling and doing. May you all create a life filled with the bliss of God.

buzzkill...

@ghasley 


+1. like a turd in the punch bowl.

So here is a question, @kuribo has gone hard at the aforementioned amplifiers built by Ralph and his fine company, question is have you an opinion (yep regret that now) on the AGD GaN mono blocks? 

@juanmanuelfangioii

If one can get past the aethetics/gimmickry, this is what a reviewer had to say about the $20,000US version:

"output impedance [dashed trace, see Graph, above] rises steeply at HF, as does distortion, while the frequency response varies with speaker load impedance [unloaded/8/4/2/1ohm = grey/black/red/blue/green traces]. Put simply, if the impedance trend of your speakers rises in the treble then the Gran Vivace will likely sound brighter, and vice-versa.."

"a marked increase in THD into loads below 4ohm – typically >0.1% from 1-100W/2ohm versus 0.002-0.08% into 8ohm. Under continuous conditions, distortion increases from 0.004%/1W, 0.005%/10W and 0.09%/100W (all at 1kHz). Distortion also increases with frequency [see Graph 2, below] from 0.005%/1kHz to 0.07%/10kHz and 0.3%/20kHz (all at 10W/8ohm) in line with the response of the reactive output filter network."

The switching frequency is 800Khz, a bit higher than what most using silicon mosfets use (600Khz or so) but not really high enough to take meaningful advantage of the benefits of GaN mosfets. The Techniques GaN, for comparison, switches at 1.5mhz.

Load dependency is a non-starter for me. I wouldn’t call the performance "state of the art".

At $20,000US, for a shiny aluminum box and a fake tube, with performance bettered by amps at 1/20th the price, I can find little to attract me for a listen.