Dan_Gtp
Grip
- Joined
- Apr 28, 2002
- Messages
- 22
I have built my 240L vented Tempest (17hz) and been enjoying it for over a month, despite the terribly unflat in-room response. I finally got the time and energy to take it apart and inspect the inside, as I was giving up to the point of deciding it must be a design/construction error. What I mean by terrible in-room response is this: Picked an arbitrary volume, 85db and started playing test tones from 120 down. Highest db :97db @ 25hz, lowest db 64db @60hz!! Wow, not quite in the +/- 3db some of you shoot for : ) 33db diff!!
I put it back together, retested it and got roughly the same. Shaking my head I put the SPL meter down on the ground a foot or two away. Checking this way resulted in a much better +/- 8db from 120hz-20hz. So the enclosure seems to be performing appropriately, but listening possition is just murdering 60hz somehow. I have moved the sub slightly, but until I get a longer length of speaker wire, I wont be able to do anything drastic.
The listening area is only about 13' wide, 7' high, but 24' deep and opens up to my room and laundry room. As a whole the basement is 24'x26'x7', sp worst case somewhere around 4000 sq ft. Alot of space to fill with bass, but volume isnt the problem, this thing is plenty loud. The sub is on the left wall halfway between the TV and couch. Not a whole lot of room for the HT setup and you're quite close to the sub. Weird thing is, the loudest area is on the opposite wall of the sub, at the opening into my room.
Basically I was wondering if anyone has started out with such a severe problem as this? Anyone put one of these behind their couch/listening possition? Half my basement is open behind it. Still plenty of options of moving it around when I get more wire, and I'm definately hoping this problem is solvable.
Thanx for reading, and ideas or suggestions are welcome.
Dan
I put it back together, retested it and got roughly the same. Shaking my head I put the SPL meter down on the ground a foot or two away. Checking this way resulted in a much better +/- 8db from 120hz-20hz. So the enclosure seems to be performing appropriately, but listening possition is just murdering 60hz somehow. I have moved the sub slightly, but until I get a longer length of speaker wire, I wont be able to do anything drastic.
The listening area is only about 13' wide, 7' high, but 24' deep and opens up to my room and laundry room. As a whole the basement is 24'x26'x7', sp worst case somewhere around 4000 sq ft. Alot of space to fill with bass, but volume isnt the problem, this thing is plenty loud. The sub is on the left wall halfway between the TV and couch. Not a whole lot of room for the HT setup and you're quite close to the sub. Weird thing is, the loudest area is on the opposite wall of the sub, at the opening into my room.
Basically I was wondering if anyone has started out with such a severe problem as this? Anyone put one of these behind their couch/listening possition? Half my basement is open behind it. Still plenty of options of moving it around when I get more wire, and I'm definately hoping this problem is solvable.
Thanx for reading, and ideas or suggestions are welcome.
Dan