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In Reply to: RE: I'm constantly amused posted by E-Stat on November 09, 2015 at 08:06:46
What's wrong with figure 2 from the Devialet measurements? Seriously, it looks fine to me.
The Bel Canto and Anthem examples are pretty fuzzy, I'll give you that. But given that this noise doesn't go anywhere since it's way out of the tweeter's pass band, what is the harm?
Follow Ups:
we definitely have different points of reference. :)
Are you familiar with the concept of a square ? It's a pretty ordinary shape. Ideally, square wave response would actually look like a square!
Like this!
You do realize that the Devialet is working at a 96 KHz sample rate, right? That's exactly what a square wave SHOULD look like with a brick wall filter response between 40-48 KHz.
And the square wave out of the Ayre would look exactly the same if the source of the square wave was a DAC playing 96 KHz data.
Every audio amplifier is going to exhibit a low pass filter response, but the corner frequency and slope will vary from amplifier to amplifier. These difference will make the square waves look different but as long as the amplifier bandwidth is sufficiently large the difference between a slow or steep LPF characteristic doesn't really matter.
A bad square wave is one which correlate with an in-band performance issue, such as sloping tops which indicate the amp can't handle very low frequencies, anomalies caused by peaky FR, or worse yet, asymmetry.
Here is one example I would consider somewhat problematic (Sharp SM-SX100):
And another (Manley 250 Neo-Classic):
Still waiting to see a good one, yep all bad for sure and still cant understand why no 20 hz SW from JA..
Go Rossi ......
You do realize that the Devialet is working at a 96 KHz sample rate, right?So, JA is using different criteria for this test vs. that of most other amplifiers. I would agree that comparing apples to oranges is problematic.
Edits: 11/09/15
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