Sierra Tower w/RAAL in room response question

[davef]

Jim,

In addition, your room is nearly a perfect square. Those are the worst dimensions for an even room response below the Schroeder frequency. Based on the room dimensions, you have a very strong axial mode and a strong tangential mode at ~74Hz. That is what you are seeing in your measurements. Ideally, you never want to see axial and tangential modes at the same frequency, but this is the issue with square or nearly square rooms.

2 subs will help, as will my suggestion about raising the LPF and adjusting phase, and you will also need EQ to fill in the rest - if you want to try and get rid of the null. No amount of room treatment available to you will help with your null as it is too low in frequency, so don't waste your money and time trying room treatments. Also, understand that correcting this null at your listening position will cause problems in other areas of the room, not a big deal if you only listen at this one position though...

You can also set the PEQ on the L12 to the same frequency as the null, and adjust the boost amount...

[jimlucci]

Jim,

In addition, your room is nearly a perfect square. Those are the worst dimensions for an even room response below the Schroeder frequency. Based on the room dimensions, you have a very strong axial mode and a strong tangential mode at ~74Hz. That is what you are seeing in your measurements. Ideally, you never want to see axial and tangential modes at the same frequency, but this is the issue with square or nearly square rooms.

2 subs will help, as will my suggestion about raising the LPF and adjusting phase, and you will also need EQ to fill in the rest - if you want to try and get rid of the null. No amount of room treatment available to you will help with your null as it is too low in frequency, so don't waste your money and time trying room treatments. Also, understand that correcting this null at your listening position will cause problems in other areas of the room, not a big deal if you only listen at this one position though...

You can also set the PEQ on the L12 to the same frequency as the null, and adjust the boost amount...

I definitely think another sub would help in my room. I had anticipated doing that when I bought the Towers and the L12 in the beginning. The REW measurements did help find the best spot for the Subwoofer I have (which is different than where I had it) and also helped phase align it with the mains, but I can see where people can get obsessive about readings - not something I am interested in doing....JC