LSA Voyager GAN Amplifier

@mivmike

You just do not understand what you post.

The Hypex graph above is at one power level, 5 watts or about 1% of it’s output. There is about a 15-16db change from 200-20Khz. I don’t know what is happening below 200, seems all over the map. Even at 5W, the Topping only has about a 20db change from 20Hz - 15KHz. That is not much different from the Hypex.

If you test the Topping at 1%, or about 1W, then it has only about 2 or 3db change over 20Hz - 15KHz. That is quite a bit better than the Hypex.

You could choose to stop posting stuff that gets holes blown in it. Or not.

Hypex and Purifi offer quite a bit of performance data on their amp products, much more than most.

They do- and are the exception rather than the rule. Bruno uses a self-oscillating technique where the phase margin of the circuit is exceeded by all the feedback added- and so goes into oscillation. The oscillation is then used as the switching frequency- and the triangle wave derived from it. So that allows for 50dB or more of feedback even at 15KHz. You can see this in the distortion vs frequency curves.

 

You just do not understand what you post.

The Hypex graph above is at one power level, 5 watts or about 1% of it’s output. There is about a 15-16db change from 200-20Khz. I don’t know what is happening below 200, seems all over the map. Even at 5W, the Topping only has about a 20db change from 20Hz - 15KHz. That is not much different from the Hypex.

If you test the Topping at 1%, or about 1W, then it has only about 2 or 3db change over 20Hz - 15KHz. That is quite a bit better than the Hypex.

You could choose to stop posting stuff that gets holes blown in it. Or not.

Obviously I understand that one is power vs distortion at multiple frequencies measured individually. And the other is THD+N vs frequency over the entire bandwidth. Which is a very useful test that should have been included in the Topping review. But it wouldn’t have been pretty. There’s a 20dB difference in noise and distortion at 5w between 1khz and 15 with the Topping! Only 20dB? 20dB is loads! with the Hypex it’s flat as a pancake. And thats a 10 year old amp design!

And with the Topping by 50w output its a 35dB spread! Horrible performance!

But the Topping is still the 2nd best amp in the world according to your mentors.

There’s a 20dB difference in noise and distortion at 5w between 1khz and 15 with the Topping!

But still the 2nd best amp in the world according to your mentors.

@mivmike , there is a 15-16 db difference with the Hypex. 20*log(0.15/0.025) = 15.6db. That is not much different from 20db w.r.t. distortion.  Amir does not know nearly enough to be a mentor to me, and there are many on ASR with more knowledge and experience, all of which is meaningless. This is about your posts.

I could be your mentor if you took the time to understand what I am writing. Here is another mentoring for you. The Topping is -75db distortion at 5W, 15KHz. That is 0.017%. That is almost exactly the same as the Hypex at 0.015%. At lower frequencies, the Topping is even better than the Hypex. Of note, the ASR graph is 45KHz BW, so after about 10KHz, the THD will not be audible to anyone, and for most here I expect that will be the case at close to 7-8KHz.