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Discussion Starter · #1 ·
Here's a reading I took after adding just one floor to ceiling corner superchunk bass trap in my room and then a second reading after adding two more floor to ceiling corner superchunks plus one front wall-ceiling superchunk the entire width of the room. I'm barely an amateur with this stuff, but it looks like I'm not seeing much of a difference. Can anyone comment on these two readings?

Thanks!
 

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Discussion Starter · #6 ·
Thanks for the replies. I screwed up when generating the waterfalls. I had Time Range set at 300ms and Window set at 600ms when all my previous graphs had the two settings reversed. The two corrected versions are below.

To the other questions... My room is about 10' x 16.5' with a small hallway of about 4' x 4' off to the front right side of the room. All the doors to other rooms are closed except for an opening of about 3' x 3' where I built an equipment rack into the closet of an adjacent room. I plan to seal this off.

I currently have a single sub (HSU VTF 2 MK1 - though I am currently on the pre order list for Emotiva's new dual sub). The sub is in the front left corner currently. There are a few other locations that I can try. However, shouldn't the bass traps make some improvement regardless of the location of the sub?

Thanks!
 

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Discussion Starter · #9 · (Edited)
Can you tell us what your expectations are?
brucek
Hmmm?? Good question... I kind of feel like it's all or nothing with the bass. It's either not there or it's overpowering everything and almost totally lacking in definition. This make any sense? Sorry for the amateur description. :dizzy:

While I'm thinking of it, what might a decent waterfall graph look like? Anyone have an example to share?

Here's one more graph. I took the reading about 4' closer to the front of the room.
 

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Discussion Starter · #13 ·
Thanks for all of the additional responses. Some additional info...

I accidentally forgot to save the reading the reading that I took before I added any traps. Thus the comparison between 1 trap and 4 traps. To further complicate matters, when I opened my MDAT file today, ALL of the readings were gone except for the last one taken the other day. What the happened?

The SPL difference between readings... glad you brought that up. I am almost sure I was using the exact same Windows volume, REW, and pre-pro volume settings for both readings. I don't understand why the difference. Anyway, I adjusted the volume on my pre-pro to get a reading with peak SPL closer to the initial reading. I hope this is the right way to approach this.

Also, one other error I noticed between my 1 trap reading and my 4 trap reading... the open port on my sub was pointed away from the wall on the former and toward the wall on the later. I did some readings each way, and this definitely seems to make a difference. The new reading below reflects the port pointed away from the wall again.

One more thing about the reading below... I added one more 34" superchunk bass in the middle of the back wall-ceiling corner.

Another question... I tried switching my waterfall from logarithmic to linear. However, it comes out all scrunched up with I do linear (see below). What am I doing wrong here?

In general, I still don't feel as though I hear the tightness I would hope for. If it makes any sense, I kind of feel like it's all or nothing with the bass. It's either not there or it's overpowering everything and lacking in definition.

It sounds like it might be another six months before I get my new dual subs (which will also include EQ options). :-( Until then, I can tinker around with seating and sub location.

I just want to know that the countless hours and money that I sunk into building these bass traps is at least having some positive impact. :)

Also, DrWho, can you explain how I would measure the frequency response in the corners where I put the acoustic treatment? Do I simply remove the treatment, place the SPL meter in the corner on my tripod, and take a reading?

Thanks again!!
 

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