Has anyone heard the new North American products preamp and amp?

Tbg wrote,

"Geoffkait, you sound like Trump claiming that my post has nothing to do with the topic while you are the one that touts measurement."

--- I am not touting measurements. Where did you get that from? What I am doing is illustrating that the whole idea that measurements cannot be made of extremely minute particles or phenomenon can be made and has been made for eons. So the argument that nano scale events or objects can't be measured must be false.  Sorry to be the bearer of bad news.  

Tbg also wrote,

"Get serious! I know you never do measurements from our conversations over the years."

- Sorry, but you are mistaken. I am quite capable of and actually do perform measurements on some of my products, where appropriate. But as I said whether I do or not, who cares? Aren’t you paying attention?

That’s not all. He also wrote,

"Fortunately, neither Roger nor I take your comments seriously. I guess you are also a member of the club as you never take anyones’ opinions seriously."

Well, whoop di do. The feeling is mutual. I take people’s statements for what they are worth. You seem to have a frog in your pocket if you are looking for my opinion and can’t seem to keep up with the discussion.

He he also wrote,

"So since all of those who have heard the H-Cat amp love it, I will bow out."

OK, whatever. As I said you cannot seem to formulate a real argument on the various topics discussed on this thread. Plus you are sinking to personal attacks. Am I in a scene from 12 Angry Men? Lol

no goats no glory

geoffkait,

I will be the first to admit you guys have a better grip on the physical vibration issues. I'm still learning. But I do have a grip on electronic signals and how they behave in amplifier circuits. That has been my life's work. My obsession with accuracy has taken me down to the "tiny" world of analog errors. I wanted to see the first [velocity error] happen before it manifests itself as full blown distortion. That's the place to clobber it before it gets out of hand. I can force the phase of fundamental to stay within fractions of a degree of dead true.

The equivalent physical vibration would be extremely high to cause the fundamental to move a full octave or more away from true producing harmonic distortion. That is a serious shift in velocity.

Roger

Someone who is a member here and now, stepped away from his use of an active servo isolation platform made in Europe and costing many thousands of $..this was many years ago. I wonder why.

To Roger,

Many years ago Polk Audio used laser interferometry [probably from Johns Hopkins] to measure the cabinet motion of a new time aligned speaker. They found a speaker that sits directly on a hard surface or a carpet over foam floor and played at a reasonable volume level causes the cabinet to travel further than the excursion of the tweeter. This cabinet activity greatly reduces the advantages of time alignment. Would this severe cabinet motion with drivers enclosed or attached also create unwanted and audible Doppler distortion? Tom

theaudiotweak
1,337 posts
02-28-2016 9:24pm
"Someone who is a member here and now, stepped away from his use of an active servo isolation platform made in Europe and costing many thousands of $..this was many years ago. I wonder why."

I'll go out on a limb here: operator error. Am I close?

theaudiotweak,

Many years ago Polk Audio used laser interferometry [probably from Johns Hopkins] to measure the cabinet motion of a new time aligned speaker. They found a speaker that sits directly on a hard surface or a carpet over foam floor and played at a reasonable volume level causes the cabinet to travel further than the excursion of the tweeter. This cabinet activity greatly reduces the advantages of time alignment. Would this severe cabinet motion with drivers enclosed or attached also create unwanted and audible Doppler distortion? Tom

Yes I would say it has to have an impact although the underlying time alignment is still valid and the additional vibrations (caused by the cabinet) will add blur to an "aligned" image. IOW objects would have an average (out of focus) location contaminated at least in part by the motion of the cabinet.

Roger