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I have an annoying 60-100Hz bump in my room accoustic response (approximately 10-15dB). What is the most effective way to supprass it without spending a fortune?
1) I am using a pair of AP Virgo's and a HGS 12 sub.2) The Virgos' are placed 2' from the side walls and 5.5' from the back wall and a separation of 9' between the them. They are toed in pointing aprox. 1' behind the listening position. The speakers and the listening point form an equilateral triangle. The sub. sits in the left front corner pointing straight along the left wall. This setup seem to produce the widest sound stage and the best focused image.
3) The room size is 16' x 22' with a 15' cathedral ceiling. The shape of the room is "L" shaped with a 11' opening into the dining area at the right side.
4) The room is treated with six 2'x4'x2" Sonex panels. 2 on the side walls next to the speakers. 2 on the backwall against the back corners. 2 on the ceiling slightly behind the listening chair. The wall behind the speakers has a large picture window and the wall facing the speakers has a large glass sliding door leading to the deck(can't do anything about it :-().
I hope the above information can be useful.
thanks.
Hi Kw,The additional information helps a great deal. As Jon suggested, the room is probably "loading" in the corners and possibly also at the ceiling (is the ceiling "vaulted"?). At a minimum, you should treat the upper corners as well as the mid corner positions of each corner of the room (that includes the farthest rear corner of the "L").
Since you have your sub firing right along the wall, you are probably getting maximum reinformcement. Have you tried placing the sub "across" the corner facing diagonally into the room? Also, if the Virgos do go down to their spec level in your room (around 34 Hz), your Velodyne sub crossover point should be no higher than around 60Hz. Also, try moving the Velodyne a foot or so closer into the room (inches can make a big differene with sub placement, so try a few inches or so at a time) to try to smooth out the bass response.
As Jon suggested though, corner treatment should be in order regardless of what the other suggestions do for you. Let us know how you make out with some experimentation of your sub placement and crossover point. If you are not doing so already, also run your Virgos "full range" with the Velodyne just filling in the lower octaves.
Best wishes,
Jim
Most likely some bass traps ala ASC TubeTraps will help. These must be placed in the corners for amximum effect, and as what you describe sounds like a fundamental room mode and or some of the harmonics, corner placement is what it will take to tame these.See:
http://members.xoom.com/Jon_Risch/a1.htm
for a DIY note on building your own bass traps that work just as goos as the retail kinds.Jon Risch
What speakers are you using?What is their proximity to wall surfaces and their placement in the room?
What are the room dimensions?
Are you using a subwoofer? If so, where is it located?
What are the physical attributes of your room (alcoves, bay window, construction materials of the room, etc.)?
Anything "unusual" about the room?
If you provide the answers to the above, it will assist others in helping you.
Best wishes,
Jim
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