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In the Forum: Playback Listening
In the Thread: Basic guide to advanced audio
Post Subject: Switch off one of the stereo channels…Posted by Romy the Cat on: 7/31/2011
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 haralanov wrote:
So the tweeter is always needed. The bad thing is it deforms (in 99,9999999999999999999% of the cases) the perfectly round audio window, formed by the midrange channel and "pull" some notes sometimes at its axis. These are often the notes that have their fundamentals at the upper working range of the midrange channel. The higher the midrange channel extends (but only if it has good tonal complexity in its upper range!!), the less prominent that effect is. Doing this, it deforms the coordinate system of the sound field and mainly affects its deepness and unlimited openness. It could be very easily detected by just listening only one of the channels of a given stereo system. But first of all, I have to note this cannot happen if the midrange/widerange channel is not able to project that coordinate system. Everything depends on it. In the world of direct radiators it is mainly a matter of size of the driver. 8” widerange could not even dream for open space presentation, despite the fact it can have mind boggling tone. …. Not even 10” – it could present the correct size of the images, but there is still a lack of the original space around these images. 12” – this is another world, but only if made properly. There are no 12” widerange drivers made commercially that can do this, so unfortunately no one can understand what I’m talking about. About the world of horns – I do not know – I just don’t have enough experience, but I suppose there is a minimum diameter of the horn’s throat (just like there is minimum size of the voice coil of direct radiators) in order to be able to project that space.
  
I am not familiar with those types of drivers and with the results they are able to show. I know that that there are some people (not in US) who tend to use open baffles and large light drivers with no suspension but I do not know what results they are getting from it.
 haralanov wrote:
No, no, I’m talking just about switching off one of the Macondo’s stereo channels – not the tweeter of one of the main channels. This is the only way to know the true capabilities of your driver’s setup and its absolute performance and it is the most difficult test for ANY system to pass.
So what do you hear after you switch off one of the stereo channels? Do you feel any collapsing of sound and especially the scale of sound? Do you feel that the sound is pushed inside your midrange horn? Do you feel the size of the instruments has shrunk down? Does the sound still breathes freely in the air? Are you still able to feel the original acoustic atmosphere of the recordings or you now have the feeling that the sound is just in front of you inside your room?

Of cause when we set up sound of loudspeaker we deal with only one right or left channel.  Regarding the switching from full stereo to mono by only from right or left channels then it is slightly from different plot. Of cause I have “collapsing of sound and especially the scale of sound” but it only happened for my stereo listening position.  To use a single speaker and to get proper mono sound it requires having the speaker to be positioned in the room differently. Since I do not move the speakers when I go mono I do prefer to have mono coming from both right and left channels. I know there are people who love to preach that it is impossible to get proper mono from stereo installation but I disagree and I very much prefer mono coming from both speakers in my room. I am talking about mono sound not accidently as I do not feel that only right or only left channels of stereo sound is worthy  in most of the cases.
 
The Cat

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