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Skeptico Saloon: An Objectivist Joint - Page 50  

post #736 of 1671

are you asking if an amp sounds different after "warming up" 20mn or do you talk about a change in the long run.

post #737 of 1671

I think this is more of a material science, physics question.  Ones that specializes in material changes should be more cable to answer than a one that focus on EE.  Also EE has many facets, some may be more knowledgable in power, and others in circuits, some in fabrication, some in signals, and etc..  Like any other disciplines.

post #738 of 1671
Quote:
Originally Posted by castleofargh View Post

are you asking if an amp sounds different after "warming up" 20mn or do you talk about a change in the long run.
I was thinking more for the short term period (20 minutes) yeah.

Quote:
Originally Posted by SilverEars View Post

I think this is more of a material science, physics question.  Ones that specializes in material changes should be more cable to answer than a one that focus on EE.  Also EE has many facets, some may be more knowledgable in power, and others in circuits, some in fabrication, some in signals, and etc..  Like any other disciplines.
I think EEs are more likely to design and build a circuit than material scientists, so I thought perhaps an EE would be able to provide more information about an amplifier's performance because of this phenomenon. But yes, of course there are different areas of EE focusing on different topics.
post #739 of 1671

Solid state amps sound the same right after startup as they do after playing all day.  Hope that helps.

post #740 of 1671
Quote:
Originally Posted by blades View Post
 

Solid state amps sound the same right after startup as they do after playing all day.  Hope that helps.

 

This is a rather bold statement on your part. Solid state electronics are well known to have temperature-dependent variations, consequence of which lead to some amount of variation in analog characteristics. A circuit must be designed with temp compensation in mind to ensure constant analog characteristics over operating temperature range. The amount of variation you may experience highly depends on the circuit itself. As there are nearly countless circuit topologies used  it is incorrect to say that all SS amps are going to be temperature agnostics.


Edited by Digitalchkn - 6/8/14 at 2:01pm
post #741 of 1671

Reason why I say material science major is because IC fabrication involves material scientist's expertise is because they know physical properties so well.  An EE will not focus on that aspect and has other aspects they are on the look out for.  Solid State electronics theory is based on lots of physics formulas with temperature variables in mind.  Lots of material science stuff in there.  

post #742 of 1671

Power chord discussion here, if some of you want to join in or spectate.  :D

 

http://www.head-fi.org/t/702787/chord-hugo/4230#post_10618407


Edited by SilverEars - 6/8/14 at 2:38pm
post #743 of 1671

I'm afraid we aren't allowed in that group.

post #744 of 1671
Quote:
Originally Posted by SilverEars View Post

Power chord discussion here, if some of you want to join in or spectate.  biggrin.gif

http://www.head-fi.org/t/702787/chord-hugo/4230#post_10618407
What is that? It looks like a Wheatstone bridge setup, but there are inductors and capacitors in there instead of resistors.
post #745 of 1671
Quote:
Originally Posted by miceblue View Post

Do you think some solid state amps perform differently after the device has been running for some time and the temperature of the amp remains at a stable value? I'm wondering if this is the case for Class A amplifiers since they're so inefficient and they tend to warm up quite a bit.

 

Different, as in:

 

- audible, no.

 

- measureable, probably. Particularly the characteristics of diodes and transistors, I suppose.

post #746 of 1671
as a totally subjective finding, I remember when I had a pico slim, I felt like the sound was better 10 or 15mn after turning it ON. take that for what it was, a feeling. I could never put a finger on what was the audio difference so it might very well have been pure placebo.
but I didn't feel that from other protable amps and never though it was something possible in the first place, so "maybe".
anyway I'm not the kind of guy to think "hey!!! I will probably like to listen to some music in 20mn, let me just turn the amp ON in advance" ^_^. when I want music I turn it ON and it does what it does, if it goes better 15mn later good, if not, good.
post #747 of 1671
Got a question for you guys.

Say I have an impulse response in a wave file. What's the easiest, programmatically most idiot-proof way to generate a minimum phase inverse filter (ie correcting frequency magnitude response but not phase response) for said impulse response?
post #748 of 1671
Quote:
Originally Posted by Joe Bloggs View Post

Got a question for you guys.

Say I have an impulse response in a wave file. What's the easiest, programmatically most idiot-proof way to generate a minimum phase inverse filter (ie correcting frequency magnitude response but not phase response) for said impulse response?

Calculate the inverse filter in matlab or octave in Fourier space and export a convolution filter?
I've never tried this, but that would be my approach.

Cheers
post #749 of 1671
Quote:
Originally Posted by Joe Bloggs View Post

Got a question for you guys.

Say I have an impulse response in a wave file. What's the easiest, programmatically most idiot-proof way to generate a minimum phase inverse filter (ie correcting frequency magnitude response but not phase response) for said impulse response?

 

Just want to point out that linear phase filter (which sounds like what you are looking for) is not exactly same as min phase filter. Min phase filters are causal, lin phase are not stricly speaking causal which I suppose makes some people non-believers.

post #750 of 1671

For those who do their own recordings, Neumann is running a contest to give away their new microphone, the TLM107. Pretty sweet mike!

 

http://splur.gy/r/rMQ9N/r/2N4fqyxxbc0

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