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Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144139 09/07/06 01:36 AM
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I've said it before, I'll say it again.

Party at Randy's House!

Looks great, buddy. Very inspiring.


bibere usque ad hilaritatem
Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144140 09/11/06 03:46 AM
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Ok, some more graphs. I was going to combine everything into one graph as I did earlier in this thread, but it was getting hard to distinguish between each one. So, here are three graphs: no treatments, front wall superchunks, and supers with ceiling/side wall first reflection panels.

I'm a little confused why it appears my lower bass numbers seemed to improve in the second graph, but have risen slightly in the third graph. I have toed in my mains a little more, and it is possible my sub dB might have been bumped up a dB or so in calibration, not sure.

Anyway, it does appear the higher bass frequencies have improved even more since adding my 6 first reflection panels.








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Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144141 09/11/06 04:04 AM
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Can I try to talk you into combining the graphs anyways, maybe with different colours for each situation ? I'm trying to look at them together but it's kinda hard on the eyes


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Re: My Superchunk Bass Trap Project, Graphs includ
bridgman #144142 09/11/06 01:53 PM
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John, I can combine onto one graph tonight when I get home. The first graph earlier in the thread comparing "no treatments" to "superchunks" looked good with Red and Blue, but when I tried to throw a 3rd color in the equation the lines intersected and it was hard to make them out. Maybe if I change the X/Y settings to make is easier to read, I'll see what I can do...


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Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144143 09/11/06 06:50 PM
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Yeah, it gets kinda busy with all three datasets on the same graph...



(The "Darken" blending mode and the "Replace Color" feature in Photoshop make quick work of superimposing charts of the same scale )

From what I can see, your most recent tweaks result in the best curve. The dip at 145Hz has been brought up by 8dB. The dips at 175Hz abd 196Hz have also been greatly improved. The unfortunate part is that the treatments don't seem to be doing much for your peaks.

Last edited by pmbuko; 09/11/06 06:57 PM.
Re: My Superchunk Bass Trap Project, Graphs includ
pmbuko #144144 09/11/06 07:09 PM
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Thanks Peter,

For those peaks, other than the superchunks in the front corner, I have done nothing else for bass trapping. The first reflection panels are more geared for mid/hi freq's. I still have plans to incorporate more bass traps to handle the lower frequencies.

I do like the improvements from about 160 and higher, represented by the red line in your masterpiece.


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Re: My Superchunk Bass Trap Project, Graphs includ
bridgman #144145 09/12/06 12:34 AM
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OK, here is my combined graph. What do you think?




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Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144146 09/12/06 02:49 AM
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>>> What do you think?

Patriotic!

That 35-40 Hz range sure took a swing in the opposite direction...why would that happen?


Rick
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Re: My Superchunk Bass Trap Project, Graphs includ
RickF #144147 09/12/06 03:15 AM
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Ya got me Rick? I was pretty pleased to see the improvements in those lower numbers after just adding the front superchunks. Seems now that it is similar to my original readings. There is good improvement in the higher frequencies.

I think my sub placement may be not ideal, and I've always struggled to understand where to put the 500. Also, I think I had it running a bit hot, again, not sure where it should be when calibrating with SPL meters. I usually put everything at 75dB using the test tones on the AVR.


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Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144148 09/12/06 04:21 AM
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Is there any chance you have a bunch of things "two feet from the wall", specifically the M60s ? Only guessing, but the dip around 140-150 Hz corresponds to cancellation from being "just under two feet" from a wall.

I don't really know where to start, other than to say that it's probably mains rather than sub at that frequency, and that measuring from the fronts of the mains is probably the right thing to do.


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