Popular Post bluesman Posted November 9, 2020 Popular Post Share Posted November 9, 2020 This is a classic example of bass reinforcement by proximity to reflective surfaces (boundary effect). Floor placement alone boosts omnidirectional frequencies (below 80 or so) by about 3 db. Put it on the floor and against a wall to add another 3 or so. Corner placement on a floor adds another dose. Reflected bass is close to but not perfectly phase aligned, and this is affected by exact positioning (angulation in all planes, spacing between surfaces and speakers etc). So the reinforcement makes it louder but often muddies it up. Read about it in this piece from TAS on improving your bass. Here’s the most relevant paragraph: ”Bass from the loudspeaker, radiating omnidirectionally, is reflected from the room’s rear wall and sidewalls. This reflected energy combines with the direct wave from the woofer essentially in-phase, combining constructively to increase the bass amplitude. This is the common phenomenon known as ‘room gain’ - a bass boost added by the room. The direct and reflected waves aren’t precisely phase-aligned, which causes some frequencies to be boosted more than others. In the upper bass, the direct and reflected waves can be out of phase, combining destructively to create a dip in the frequency response. This phenomenon colors the bass, adding an unnatural emphasis or de-emphasis to certain registers of certain instruments, particularly basses. Because the frequency at which this reinforcement or cancellation occurs is dependent on the distance between the speaker and the room boundaries, we can use good loudspeaker placement techniques to mitigate the deleterious effects of this phenomenon.” 992Sam, skatbelt, John Dyson and 2 others 3 1 1 Link to comment
Popular Post bluesman Posted January 23, 2021 Popular Post Share Posted January 23, 2021 On 11/4/2020 at 12:34 PM, 992Sam said: Ok, so I have noticed that ever since I put my XR50's up from the 3" stands they were on before (effectively at floor level) to my 2.5' tall stands (they are a solidsteel, high quality stand)... I am getting a bit less bass... not bad bass per se, but not as good as it was when they sat nearly on the floor. Any ideas on why this counter intuitive situation could be happening? Posted November 8, 2020 This is a classic example of bass reinforcement by proximity to reflective surfaces (boundary effect). Floor placement alone boosts omnidirectional frequencies (below 80 or so) by about 3 db. Put it on the floor and against a wall to add another 3 or so. Corner placement on a floor adds another dose. Reflected bass is close to but not perfectly phase aligned, and this is affected by exact positioning (angulation in all planes, spacing between surfaces and speakers etc). So the reinforcement makes it louder but often muddies it up. Read about it in this piece from TAS on improving your bass. Here’s the most relevant paragraph: ”Bass from the loudspeaker, radiating omnidirectionally, is reflected from the room’s rear wall and sidewalls. This reflected energy combines with the direct wave from the woofer essentially in-phase, combining constructively to increase the bass amplitude. This is the common phenomenon known as ‘room gain’ - a bass boost added by the room. The direct and reflected waves aren’t precisely phase-aligned, which causes some frequencies to be boosted more than others. In the upper bass, the direct and reflected waves can be out of phase, combining destructively to create a dip in the frequency response. This phenomenon colors the bass, adding an unnatural emphasis or de-emphasis to certain registers of certain instruments, particularly basses. Because the frequency at which this reinforcement or cancellation occurs is dependent on the distance between the speaker and the room boundaries, we can use good loudspeaker placement techniques to mitigate the deleterious effects of this phenomenon.” March Audio and botrytis 2 Link to comment
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now