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Post by Hexspa on May 7, 2017 20:08:32 GMT
1/4 Wavelength Gap, Full SPL, 1/3 Octave Smoothing Applied: 1/4 Wavelength Gap, Bass SPL, No Smoothing:
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Post by Hexspa on May 7, 2017 20:10:01 GMT
1/4 Wavelength Gap, Waterfall: 1/4 Wavelength Gap, Decay:
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Post by Hexspa on May 7, 2017 20:25:11 GMT
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Post by Hexspa on May 7, 2017 20:40:12 GMT
As of right now it seems like gapping at least 2' does the greatest benefit above 50Hz.
Flush (close) in corner is best in the 30Hz range but my SPL isn't flat down there.
1/4 wavelength gap seems to flatten bass SPL the most with the exception of the null at 195Hz but I guess that could be improved with more treatment.
Let me know what you guys think - I have to decide where to put these things.
-m
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Post by Hexspa on May 8, 2017 1:36:52 GMT
One more thing...
I moved my sub.
I tried the method outlined on the Bass Integration Guide: placing your sub at LP then moving your mic to find an ideal location.
I didn't consider nulls and I didn't measure behind my desk.
As it turns out, the best location I measured was actually almost exactly in a null of the front-to-back axial mode (6.14'/24.75') Needless to say, 44Hz wasn't looking so hot.
So using 3rd grade math and referencing hours of forum lurking I remedied the problem. Will post results. Much better bass.
I felt like a wizard. A room eq wizard.
-m
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Post by Hexspa on May 9, 2017 0:47:35 GMT
Ok maybe I'm not a room EQ wizard yet. The SPL did improve but ringing is questionable. I need to go back and look at what the super chunks were doing at the various gaps at each frequency band. I think the null at 187Hz is from my desk. We're still in the early stages of this room so we'll address each concern as we go.
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Post by Hexspa on May 9, 2017 0:48:23 GMT
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Post by Hexspa on May 9, 2017 3:40:25 GMT
Before I sign off (for the day) I want to give myself some goals for tomorrow:
1. Physically measure the room, more accurately. 2. Determine where peaks and nulls should be (based on halves and quarters) and mark them with tape. 3. Identify correlating info in the graphs I just posted. 4. Position my speakers to reduce nulls and peaks to the greatest extent possible. 5. Position super chunks to reduce ringing to the greatest extent possible.
After that I can determine where to place my remaining 20 4" rigid panels and see whether, and how much, additional treatment is needed.
I was kind of cavalier approaching this room. I thought the response in my last room was good but this room is different and I think I should get back to basics.
-m
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Post by Hexspa on May 9, 2017 3:46:27 GMT
Hey, Ethan:
If you're here, can you (or anyone) link me to that video you did in your partner's studio with the balloons proving your theory about broadband absorption?
iirc you're using an RTA and I think I could use some help.
Thanks,
-m
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Post by Hexspa on May 9, 2017 17:54:36 GMT
Alright, this is what I'm currently looking at:
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Post by Hexspa on May 9, 2017 17:55:03 GMT
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Post by Hexspa on May 9, 2017 18:10:17 GMT
From what I can tell I'm marginally better with the bass spl I think the null at 187Hz is from my speakers being about 4.5ft from the ceiling. Maybe a cloud should help that. slightly better with 1/3 smoothed overall ringing is a bit more even if slightly worse overall decay between 40 and 50Hz is better
These measurements were taken with the mic 1' up from current LP.
Will be moving my desk later.
Pretty sure I'm going with this positioning unless someone reasons me out of it.
Going to bring in my panels soon.
-m
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Post by Hexspa on May 9, 2017 19:50:48 GMT
Last one for the day. Got to move my LP up 1'. Panels are in the room but not yet installed.
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Post by Hexspa on May 9, 2017 19:51:24 GMT
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Post by Hexspa on May 9, 2017 19:55:28 GMT
I think the ringing looks worse than it is since I brought the sub's level up more.
Really, the last ringing is around 43Hz (rear wall most likely) and 65Hz (dunno honestly, maybe ceiling).
There's also some around 32Hz but we aren't worried about that.
Again, I'm guessing the persistent null below 200Hz is ceiling SBIR.
Seems like the panels had a residual effect down to 32Hz.
They're currently wrapped in seran wrap, two to a package (8" thick) leaning vertically against the wall sticking out about 2' (10 packs in total).
I only put one on the rear wall so that would explain how they had virtually no effect on the ringing at 43Hz.
-m
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