Room Demensions, am I in trouble?

my calculations show room nodes too close together at 7&8 and 15&16. If your measurements are correct you will need to correct for the like node cancellations that will occur at the noted points and others will likely occur in your seating position. otherwise my only comment is, that is a sheet load of speakers for such a small room and should likely give you some pretty incredible theatre sound and overload + room resonance galore! Go three channel + subs trade one set of speakers in for some tiny ceiling mounts and save some precious space.

AudiogoN post set up will not allow for my chart to post properly so each line has a accendinghz and differential value except the last doesn't have a differential. Length has 7 values, width 6 and height 4

Length Width Height accending differential
14 12 8 order


40.35 47.08 70.62 40.35hz 6.72
80.71 94.16 140.54 47.08hz 23.54
121.07 141.25 210.82 70.62hz 10.08
161.42 188.33 281.09 80.71hz 13.45
201.78 235.41 94.16hz 26.90
242.14 282.5 121.07hz 19.47
282.5 140.54hz 0.70
141.25hz 20.17
161.42hz 26.90
188.33hz 13.45
201.78hz 9.035
210.82hz 24.59
235.41hz 6.72
242.14hz 38.95
281.09hz 1.40
282.5

Thanks for the incredible info!!!
If I understand you correctly, I'm looking at some pretty boomy bass? I'm not real clear on the technical measurments you guys put out there, but I'm hoping that by installing some bass traps I can tame some of the out of control bass. I'm also wodering if I would benefit from instlling some sound damping material behind the listening position and the first reflection area on the side walls?

Nice post, Ozfly. Mhubbard, DO find Rives. I would suspect that you'll have to exoeriment with moving that sub around a lot. The Thiels go down pretty low, and with room support maybe you could do without it?! Sidewall reflection control is always important; yet you might not want to tame them TOO much as otherwise you'll not have a wide enough sweep spot in such a small room for more than one-two people. HT isn't easy....

Thanks Ernie. Mhubbard, while my knowledge is much more limited than many others on the topic, I would suggest three things. First, tune your subwoofer carefully (probably by turning it down to compensate for the pressure zone). Secondly, see if you can tune the room treatments to absorb the peaks at 45, 140 and 280 Hz -- this might be a tough thing to do. Third, experiment with your listening position -- some spots in the room will be better than others. By the way, the Rives site is a good one. The Rives equipment might also help (seems like it would, but I have not personally tried it). Good luck.

You can reduce the deliterious effect of having room modes close together by adding acoustic absorption in the bass region. The good news is that with your room dimensions, the biggest problem frequencies are relatively high (140Hz & 280Hz), so bass tools such as Tube Traps will work reasonably well. By providing bass absorption, you will reduce the Q of the room which will reduce the amplitude of the peaks and dips and spread out their frequency range. The only disadvantage is that this will be you'll need more bass energy from your subwoofer to create the same level of bass in the room.

If you need absorption of a specific narrow frequency range, I'd recommend RPG Modex panels. These are relatively expensive, but very effective at low frequencies. Tube Traps work well above 100 Hz, but not particularly well in the low bass frequencies.

There are many DIY articles on the net describing how to make your own tube traps. If you're a little handy in the workshop, you can make a decent tube trap for $20-$50 (depending on whether you want fancy fabric covering).

Good luck.