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20th November 2012, 04:12 PM  #29611  
diyAudio Member

Quote:
If you equalize the frequency response, no matter how flat is it's 2d representation (level VS frequency), look at waterfall (time added) and you will see that sharp resonances still produce audible colorations because sounds on some frequencies decay longer than on others. Equalized sh*t sounds like equalized sh*t.
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The Devil is not so terrible as his math model is! 

20th November 2012, 04:29 PM  #29612  
diyAudio Member
Join Date: Nov 2008
Location: Small village, Israel

Quote:
Will it work also with JFETs as the folded cascade, like in the attached schematics? 

20th November 2012, 04:29 PM  #29613  
diyAudio Moderator

Quote:
I had indirectly asked SY which resonances are equalizable. He responded there: I took the risk to interpret his answer like this: I don’t know if I guessed well. George
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["Second Law is a bitch."  SY] ["The Road To Heaven:Specify the performance & accept the design. The Road To Hell:Specify the design & accept the performance"Bruno Putzeys] 

20th November 2012, 04:32 PM  #29614  
diyAudio Member

Quote:
__________________
The Devil is not so terrible as his math model is! 

20th November 2012, 04:38 PM  #29615 
diyAudio Member

I have no idea, it's a closed box for dummies, in 5+1 receiver. Calibrated microphone goes with it. It asks to position microphone in 6 different places, does fast sweeps through all channels one by one, calculates levels, delays, EQ. From what it does as the result I conclude that it equalizes mic position  independent things storing results in nonvolatile memory.
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The Devil is not so terrible as his math model is! 
20th November 2012, 05:00 PM  #29616  
diyAudio Member
Join Date: Apr 2002
Location: Prague

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Cheers, 

20th November 2012, 05:04 PM  #29617 
Banned
Join Date: Jul 2011
Location: Portugal

Monacor Carpower Raptor MK1 Funktionstest für Aspirin  YouTube
Diameter 12" Double spider on each side of the moving coil Impedance (Z) 4Ohms Resonant frequency (fs) 43Hz Power rating (P) 1,000WRMS SPL (1W/1m) 87dB Linear excursion (XMAX) ±13.5mm Last edited by Esperado; 20th November 2012 at 05:11 PM. 
20th November 2012, 05:07 PM  #29618 
diyAudio Moderator

Very well, but some quibbles: minimum phase can apply to nonlinear systems as well. The only requirement is that the phase be the derivative of the amplitude response wrt to frequency. And single valued functions indeed contain no loops, but if (for example) you have a 2d function unwinding in a 3d space, you can inadvertently have multiple values which are not loops in the 2d representation. Rooms have 3 dimensions (assuming the room size is time invariant!), the signal applied to them has one dimension plus time. So, no minimum phase (there's delays from reflections) and multiply valued (amplitude varies over space as well as time).
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20th November 2012, 05:11 PM  #29619  
diyAudio Member

Quote:
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The Devil is not so terrible as his math model is! 

20th November 2012, 05:45 PM  #29620 
diyAudio Member
Join Date: Jan 2004
Location: away


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