ToTo Man
the band not the dog
I've been staying up until the wee small hours recently lapping up Anthony Grimani's webinars on Room Acoustics courtesy of Audioholics' YouTube channel and feel inspired to finally upgrade / re-jig my room treatments after years of deliberation and uncertainty of the route to take. Anthony has a great way of demystifying the subject and giving real-world examples of what works and what doesn't.
I ultimately see myself going down the 'four mono subs at wall mid-points' route as I reckon this is going to be the only way to have my cake and eat it and be able to position my main speakers where they image best without compromising on the smoothness of the bass which, at the speakers' current position, is the best I've ever had in this room. However, I'd still like to explore what improvements can be made to my passive treatments.
I’ll write a longer post later that details what treatments I have at the moment and the potential upgrades/improvements I’m considering, but it would be helpful if I could start off with a couple of questions:
1) My axial mode standing waves are 45Hz (front wall to back wall), 42Hz (side wall to side wall) and 53Hz (floor to ceiling). Will ameliorating an axial mode standing wave with diaphragmatic absorption tuned to that fundamental frequency (e.g. 42Hz) also ameliorate its multiples (i.e. 84Hz, etc...), or do I also need diaphragmatic absorbers that are tuned to the multiples?
2) My experience in trying to ameliorate a null caused by suspected SBIR off the back wall revealed that the absorber worked best when placed behind and in line with my listening seat. If I moved the absorber left or right so that it was no longer aligned with my listening seat, the null reappeared. Does the same apply to peaks and nulls caused by standing waves, or can you place absorbers anywhere along the axis of the node (for pressure-based absorbers) or anti-node (for velocity-based absorbers) and still achieve the same magnitude of improvement at the listening seat? Or does it depend on how high the frequency is? For example, if I wanted to reduce the 84Hz peak caused by my 42Hz room width axial mode, would I get maximum performance from pressure-based absorbers tuned to 84Hz by mounting them on the side walls precisely either side of my listening seat, or would they be just as effective placed anywhere on the side walls?
Thanks in advance!
I ultimately see myself going down the 'four mono subs at wall mid-points' route as I reckon this is going to be the only way to have my cake and eat it and be able to position my main speakers where they image best without compromising on the smoothness of the bass which, at the speakers' current position, is the best I've ever had in this room. However, I'd still like to explore what improvements can be made to my passive treatments.
I’ll write a longer post later that details what treatments I have at the moment and the potential upgrades/improvements I’m considering, but it would be helpful if I could start off with a couple of questions:
1) My axial mode standing waves are 45Hz (front wall to back wall), 42Hz (side wall to side wall) and 53Hz (floor to ceiling). Will ameliorating an axial mode standing wave with diaphragmatic absorption tuned to that fundamental frequency (e.g. 42Hz) also ameliorate its multiples (i.e. 84Hz, etc...), or do I also need diaphragmatic absorbers that are tuned to the multiples?
2) My experience in trying to ameliorate a null caused by suspected SBIR off the back wall revealed that the absorber worked best when placed behind and in line with my listening seat. If I moved the absorber left or right so that it was no longer aligned with my listening seat, the null reappeared. Does the same apply to peaks and nulls caused by standing waves, or can you place absorbers anywhere along the axis of the node (for pressure-based absorbers) or anti-node (for velocity-based absorbers) and still achieve the same magnitude of improvement at the listening seat? Or does it depend on how high the frequency is? For example, if I wanted to reduce the 84Hz peak caused by my 42Hz room width axial mode, would I get maximum performance from pressure-based absorbers tuned to 84Hz by mounting them on the side walls precisely either side of my listening seat, or would they be just as effective placed anywhere on the side walls?
Thanks in advance!