al lout
Stunt Coordinator
- Joined
- May 6, 2004
- Messages
- 164
I have a DIY sealed Tempest sub in a 15x15x9 room with 2 openings (1 to the kitchen and 1 is a hallway). I'm trying to achieve a flat response for my sub. So far I have moved the sub in 2 different positions and have noticed a huge different.
1. First position, sub is right next to the right of the sofa. It sat at about 2' off the back wall and 6.5' off the side wall. At this position, there're 2 nulls/deeps at 40hz and at 75hz (about 23db drop). Reading at 20hz is 98db and from 25-100hz excluding the 2 nulls avg at about 104db.
2. Second position, sub is in the corner on the right of sofa as well. I am currently have it there. It's about 1.2' off both walls. With this position, there is no null spot (a small deep at 72hz of 6db). Reading at 20hz is 94db, and from 25hz - 100hz avg at around 106db.
From the 2 positions above, which position should I keep? I can't place the sub anywhere else or it will look awkward. What I can do is move the sub a few inches in/out off the walls. Question is how far off the walls should I place my sub to achieve a flatter response? From position #1, my sub is louder/ more shaking to the building. But the 2 nulls/deeps kinda convince me to put it at the corner. In the corner, the sub is a little boomy. As I don't want to move the sub too much, it's more than a hundred lbs. What do you guys suggest? Thanks in advanced.
Al,
1. First position, sub is right next to the right of the sofa. It sat at about 2' off the back wall and 6.5' off the side wall. At this position, there're 2 nulls/deeps at 40hz and at 75hz (about 23db drop). Reading at 20hz is 98db and from 25-100hz excluding the 2 nulls avg at about 104db.
2. Second position, sub is in the corner on the right of sofa as well. I am currently have it there. It's about 1.2' off both walls. With this position, there is no null spot (a small deep at 72hz of 6db). Reading at 20hz is 94db, and from 25hz - 100hz avg at around 106db.
From the 2 positions above, which position should I keep? I can't place the sub anywhere else or it will look awkward. What I can do is move the sub a few inches in/out off the walls. Question is how far off the walls should I place my sub to achieve a flatter response? From position #1, my sub is louder/ more shaking to the building. But the 2 nulls/deeps kinda convince me to put it at the corner. In the corner, the sub is a little boomy. As I don't want to move the sub too much, it's more than a hundred lbs. What do you guys suggest? Thanks in advanced.
Al,