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Bass Response on Dunlavy SC-IVa

I purchases a pair of DAL SC-IVa about a month ago and have been trying find the best placement in a less than optimal room. My room is 21ft x 12Ft with cathedral ceiling starting at 8ft in the back to 12 ft in the front where the speakers are set up against the short wall. I know they should be set up against the long wall but the existing HT won't allow this. The speaker are 49" from the rear and 20" from the center of the cone to the side wall. I have carpeting on the floor and ther is a 5ft openning 11 ft from the front wall.

I have experiemented with many placements but just can't seem to get the bass to sound right.

Any suggestions ?

Thanks
mcreight
newbee
4,794 posts
 
Are you adjusting your listening position as well as the speakers? I've found it best to work with each. Also, although many may not agree, you could actually space the speakers closer to the wall and compensate by doing some substantial toe in to reduce first reflections. You should also have a (Radio Shack) sould level meter and a (Rives) test disc to track your progress.
sean
6,231 posts
 
What type of floor do you have these on? What are the problems with low frequency reproduction that you are encountering? Any type of footer or support components between the cabinet and the floor? Sean
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theaudiotweak
2,801 posts
 
The problem is the variation in the reaction of the woofers to the floor and the ceiling. You have a large differential in boundary effects. The woofer on top is much further from the ceiling than the woofer on the bottom is from the floor. So you probably have a bass suckout of about 6db at 60 to 70 hz at ear height at your listening position. This is where much of the hit bass is on most recordings. Some geometric panels {and not soft} to act as a lens to refocus lost energy back at your chair would greatly enhance phase and frequency. Tom
snook2's avatar
snook2
627 posts
 
I never got the bass right either. On the IVA or the V's. They are one huge speaker which makes it a lot more difficult to get right and live with
lrsky
1,118 posts
 
I have a possible solution, which is worth trying.
Try listening to the room.
Play one speaker, using a low frequency test tone, with the speaker in a 'probable' final,location.
Walk around the room, and find where the 'hot spots' of good bass are. This will give you an idea as to where the potential locations of the listeners chair might be. The key is to extrapolate that in to the 3 diminsional puzzle that setting up an audio system presents.
When setting up a system in a problematic room, I always try to get a 'fix' on the room's sound.
Best
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