Sound room
This is the calculation I use to figure out where some of my problem areas will be. I just used excel to make it look neat. Any where you see a the same of very similar frequency in each coloum is where problem are likely to happen. Its an easy calculation.
1130 (speed of sound) / 2x room length in feet
the first set of numbers are the room dimensions (16.05ft, 11ft, 7ft).
Each mode is simply a mulitple of that frequency.
The worst shapped room would be a cube, because all the modes would be same. This would cause serious peeks and nulls. An ideal room will have no same length walls or walls that are multiples of each other. Odd shaped rooms would be even better, but more rooms are rectangular, so I assuming that much.
My room with use angles and coloum protrusions that I will get into on a later date.
1130 (speed of sound) / 2x room length in feet
the first set of numbers are the room dimensions (16.05ft, 11ft, 7ft).
Each mode is simply a mulitple of that frequency.
The worst shapped room would be a cube, because all the modes would be same. This would cause serious peeks and nulls. An ideal room will have no same length walls or walls that are multiples of each other. Odd shaped rooms would be even better, but more rooms are rectangular, so I assuming that much.
My room with use angles and coloum protrusions that I will get into on a later date.
Yankee
Joined: Oct 2003
Posts: 3,599
In a basement sound room the ceiling is probably the weak link acoustically. It is low and that makes sound issues and when you crank it the sound will leak upstairs through the floor boards. The foundation walls will be solid but reflective so it is a good location overall. good old inexpensive fiberglass roll insulation is good at stopping the noise from leaking upstairs and insulation in the corners would be a good bass trap as needed.
Adding bass traps will help your problem. Rugs and wall treatment will help everywhere else.
In a basement sound room the ceiling is probably the weak link acoustically. It is low and that makes sound issues and when you crank it the sound will leak upstairs through the floor boards. The foundation walls will be solid but reflective so it is a good location overall. good old inexpensive fiberglass roll insulation is good at stopping the noise from leaking upstairs and insulation in the corners would be a good bass trap as needed.
Adding absorption will help. A simple way to make a bass trap is to cut roxul into large triangles, stack them on top of each other and place them into the rooms corners. The bigger you make it the easier it is to absorb low frequencies. Corners are yor enemy!
So as you can see from the chart, I'm going to have some issues in the 100hz range. By adding sufficient absorption, I should help minimize this. I will also be using an angled bulkhead that will also act as a bass trap.
I cannot predict every problem frequency, I don't have the means to calculate how all the sound waves will propagate. This is enough information for me to plan from.
I will try to post some pics of the framing later today. Ther isn't anything acoustic about it, but its required work.
I cannot predict every problem frequency, I don't have the means to calculate how all the sound waves will propagate. This is enough information for me to plan from.
I will try to post some pics of the framing later today. Ther isn't anything acoustic about it, but its required work.
This is the calculation I use to figure out where some of my problem areas will be. I just used excel to make it look neat. Any where you see a the same of very similar frequency in each coloum is where problem are likely to happen. Its an easy calculation.
1130 (speed of sound) / 2x room length in feet
the first set of numbers are the room dimensions (16.05ft, 11ft, 7ft).
Each mode is simply a mulitple of that frequency.
The worst shapped room would be a cube, because all the modes would be same. This would cause serious peeks and nulls. An ideal room will have no same length walls or walls that are multiples of each other. Odd shaped rooms would be even better, but more rooms are rectangular, so I assuming that much.
My room with use angles and coloum protrusions that I will get into on a later date.
1130 (speed of sound) / 2x room length in feet
the first set of numbers are the room dimensions (16.05ft, 11ft, 7ft).
Each mode is simply a mulitple of that frequency.
The worst shapped room would be a cube, because all the modes would be same. This would cause serious peeks and nulls. An ideal room will have no same length walls or walls that are multiples of each other. Odd shaped rooms would be even better, but more rooms are rectangular, so I assuming that much.
My room with use angles and coloum protrusions that I will get into on a later date.
I can also watch a movie at a very reasonable( LOUD) volume and the rest of the family stays asleep
well im off to take some pictures with my phone and load them shortly.
