Av James Tanner hos Bryston Audio
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Bryston Loudspeakers
[quote author=James Tanner link=topic=97007.msg1430632#msg1430632 date=1432120184]
Hi AJ - put this together this morning for you - hope it helps.
[size=14pt]You are NEVER listening in the NEARFIELD or the DIRECT SOUND from the speaker.[/size]
HI Folks
Many times I get asked why Bryston is not concerned when placing our speakers in normal domestic audio rooms as opposed to acoustically treated rooms.
The two most critical parts of any loudspeaker system choice is the listening ‘ROOM’ and the loudspeakers ‘POLAR’ response. Recognizing how the room imposes its boundaries (floor, ceiling, walls) on the speaker and how that speaker radiates its energy (polar response) into a specific room is critical to the understanding of the overall performance of any speaker and it is no different for the Bryston loudspeakers.
When you are listening to a loudspeaker in a room you are always listening to balance between the ‘Direct Sound’ and the ‘Reflected Sound’ from the boundaries of the room – this is called the ‘Power Response or Sound Power.’ It is that balance between direct and reflected energy which changes depending on the frequency radiation pattern (polar response) of the given speaker and the boundaries of the room the speaker is placed in.
The ‘direct sound’ is the sound radiating from the front of the loudspeaker and the ‘reflected sound’ is all the sound your ears perceive after the sound waves have interacted jwith all the different boundaries in the room. It is important given real world conditions that the on axis response and the off axis frequency response of a loudspeaker be as uniform as possible.
Recognize when you listen to a speaker in a room you are NEVER listening in the NEARFIELD or the DIRECT SOUND from the speaker.
This on and off axis characteristic is generally referred to as Polar response. The smoother and more uniform the on and off axis polar response of the speaker the better the tonal balance between the direct sound and the reflected sound will be. In other words, the reflected sound will have the same overall tonal balance and sonic characteristics as the direct sound if ‘on and off’ polar response is smooth and even. This approach also provides the optimum overall 3-dimensional soundstage presentation as well. The Bryston Model-T is a very wide dispersion design so the polar response is very flat on axis and very uniform all the way out to more than 75 degrees off axis in both directions from center to provide a very wide and even listening window.
So the boundaries of the room are used to enhance the listening experience by providing a sense of spaciousness and naturalness to the listening experience. We all listen in real rooms and our brains are use to interpreting the overall direct and reflected energy in a specific manner. I find rooms that treat the reflections by trying to absorb them just makes the listening experience very unnatural and almost anechoic.
Also remember that you cannot absorb all frequencies equally as the thickness of the absorption material affects the frequencies it can affect. So a few inches of fiberglass or whatever absorptive material will only affect a specific range of frequencies – generally midranges and highs so it creates an energy imbalance in the room.
Many people will disagree with me but I have gone the route of serious absorption in many of my rooms and have always reverted back to less absorption is better and I much prefer Dispersion over Absorption. That’s my story and I am sticking to it !
James
Bryston Model T - 0 - 35 Degrees
45 - 75 Degrees
[/quote]
Likte siste avsnitt.
Link til innlegg, for bilder som ikke kom med i kopieringen.
Bryston Loudspeakers
[quote author=James Tanner link=topic=97007.msg1430632#msg1430632 date=1432120184]
Hi AJ - put this together this morning for you - hope it helps.
[size=14pt]You are NEVER listening in the NEARFIELD or the DIRECT SOUND from the speaker.[/size]
HI Folks
Many times I get asked why Bryston is not concerned when placing our speakers in normal domestic audio rooms as opposed to acoustically treated rooms.
The two most critical parts of any loudspeaker system choice is the listening ‘ROOM’ and the loudspeakers ‘POLAR’ response. Recognizing how the room imposes its boundaries (floor, ceiling, walls) on the speaker and how that speaker radiates its energy (polar response) into a specific room is critical to the understanding of the overall performance of any speaker and it is no different for the Bryston loudspeakers.
When you are listening to a loudspeaker in a room you are always listening to balance between the ‘Direct Sound’ and the ‘Reflected Sound’ from the boundaries of the room – this is called the ‘Power Response or Sound Power.’ It is that balance between direct and reflected energy which changes depending on the frequency radiation pattern (polar response) of the given speaker and the boundaries of the room the speaker is placed in.
The ‘direct sound’ is the sound radiating from the front of the loudspeaker and the ‘reflected sound’ is all the sound your ears perceive after the sound waves have interacted jwith all the different boundaries in the room. It is important given real world conditions that the on axis response and the off axis frequency response of a loudspeaker be as uniform as possible.
Recognize when you listen to a speaker in a room you are NEVER listening in the NEARFIELD or the DIRECT SOUND from the speaker.
This on and off axis characteristic is generally referred to as Polar response. The smoother and more uniform the on and off axis polar response of the speaker the better the tonal balance between the direct sound and the reflected sound will be. In other words, the reflected sound will have the same overall tonal balance and sonic characteristics as the direct sound if ‘on and off’ polar response is smooth and even. This approach also provides the optimum overall 3-dimensional soundstage presentation as well. The Bryston Model-T is a very wide dispersion design so the polar response is very flat on axis and very uniform all the way out to more than 75 degrees off axis in both directions from center to provide a very wide and even listening window.
So the boundaries of the room are used to enhance the listening experience by providing a sense of spaciousness and naturalness to the listening experience. We all listen in real rooms and our brains are use to interpreting the overall direct and reflected energy in a specific manner. I find rooms that treat the reflections by trying to absorb them just makes the listening experience very unnatural and almost anechoic.
Also remember that you cannot absorb all frequencies equally as the thickness of the absorption material affects the frequencies it can affect. So a few inches of fiberglass or whatever absorptive material will only affect a specific range of frequencies – generally midranges and highs so it creates an energy imbalance in the room.
Many people will disagree with me but I have gone the route of serious absorption in many of my rooms and have always reverted back to less absorption is better and I much prefer Dispersion over Absorption. That’s my story and I am sticking to it !
James
Bryston Model T - 0 - 35 Degrees
45 - 75 Degrees
[/quote]