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In the Forum: Audio Discussions
In the Thread: A listening room for a domesticated Cat?
Post Subject: Elementary, Watson. :-)Posted by Romy the Cat on: 10/9/2017
 martinshorn wrote:
i see the words time alignment quiet often in this forum Which is a good thing. But can you show a graph / measure that says what it means in a result?Or do you just mean the woofer is standing next to the mains?
Cheers Josh 
Josh, 

I have been written about it for years and there are plenty of it within this site. The time-alignment is one of the basis of the Macondo Axioms: 

http://www.goodsoundclub.com/Forums/ShowPost.aspx?postID=4832 

I am not sure I can show it to you in graph/measure what it means. At higher frequencies time-alignment is co-alignment of pulse responds for individual channels, in my case the HF, MF and Injection. This s very simple to measure and to demonstrate via pulse measurement. At sub MF channels it is much more complicated. The rules of sum recommend to use lower IR window to very short time, filtering the reflection and to treat the signal almost as it is HF signal. For sure it is good and allow to set the diaphragms of deferent channels equidistant to the listening position but I do not find that it is a right direction to go. One of the notion that I advocate is not to fight with listening room but to embrace the sound of the room into the design of acoustic system. Therefore I measure the time-alignment of sub MF with no cancelation of any room reflections or with combination of no cancelation with very moderate cancelation. Knowing the frequency I am dealing with I know the wave length. So, I can place a chance with visual co-aliment of the diaphragms and this will assure that within a relatively long wave length the channels are in the same period. Then all that I care it to so-align the phase in the period, or to make channels to hit the peak of sinusoid at the same time. At LF is it mess but the most important is that reflections to great degree screw the whole picture. So, What I frequently do is to drive across both channels a single frequency in the mid of the crossover divide and moving one of the channels (which was not aligned with upper frequencies) to get the maximum gain in amplitude of that single frequency. The presumption is that in case both channel hit peak of sinusoid the gain will be maximum. Pay attention that in my case the room is very much part of the picture….
 

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