Originally Posted by Martycool007 /t/1523778/corner-boost-for-bass#post_24516695
Yes, usually the smaller the room the better, or should I say, easier, it is to get lots of bass. Whether that be from boundary gain, or having a smaller space to pressurize, either way, small rooms are the easiest way to get good bass.
I am in the process of trying to design a dedicated theater room myself. I plan to use my 27 foot by 14 foot room and divide it up into two completely separate rooms, one being a dedicated theater room, and the other side will be a dinning room. One of the decisions that I am having trouble with are what the optimal dimensions are for the theater side. I have 27' by 14' by 8' to work with.
I know absolutely nothing wrt theater design, but, I will probably go with a smaller room of around 12' by 14', or possibly 14' by 17'. Can't decide....
Originally Posted by tuxedocivic /t/1523778/corner-boost-for-bass#post_24516840
I'd say an 1/8th wavelength of 100hz because the XO isn't a dead stop at 80hz and a 1/4 wave distance will be a null. That's 42cm roughly depending on the ambient temperature. But you're close to sea level and indoors, so 42cm is gonna be close. That's the center of the cone to each boundary. Floor, left, and right walls. The best way to do this afaik is to use a small baffle and down firing sub. I use up/down dual opposed and get quite a reflection free room response.
Edit- or an IB will achieve this.
I presume this is why stacked subs with drivers located at 1/4 heights of the room is recommended? (And, by extension, the SBA/DBA?)Quote:
Originally Posted by LTD02 /t/1523778/corner-boost-for-bass#post_24516704
it is a little tricky because as you work your way down in frequency, first you get reflections some of which combine constructively and some of which create cancellations. the last of the cancellations occurs when the center of the driver is 1/4 distance from the boundary. for 80hz, that is about 3.5 feet. below that point, you get more and more constructive radiation. below about 1/8th of a wavelength, most of the wave is combining constructively, so you get the +6db per boundary from the reduced space. its never quite that high because walls tend to be lossy, but that's the basic idea.
Originally Posted by Gomdaf /t/1523778/corner-boost-for-bass#post_24517340
I have a semi open ended theater that has a bar half wall at the back. It's about 25x15. My two sealed 18's are placed at 1/3 and 2/3 along the front wall and I get some pretty massive room gain. I'm not even close to being an expert on accoustics, but I get a very flat response with no nulls. I'm guessing it has to do with the semi "open ended" room. You don't get the reflected waves cancelling each other out. I'm sure there's a drawback, probably having to do with pressurizing a larger space. The experts here can probably comment further on this.
If I had to do it all over again, I'd still put the bar seating at the back. It's been great for parites and sports events. With your space you could do two rows of seats and section off a tiled area at the back for a bar type area. Here are a couple of picks and the frequecy response. Let me know if you want any help on the design or more picks, i'd be happy to share. I got most of my ideas during the build from AVS forums. The guys in the home theater design are awesome and very helpful.
I just thought I'd give you more food for thought before you go and section the whole room off. Who needs a dining room anyway!
A six foot tall wall will be acoustically 'invisible' below roughly 180Hz.Quote:
Originally Posted by Martycool007 /t/1523778/corner-boost-for-bass#post_24518529
So with regards to my room, (currently 27' by 14') that I have been planning to separate into two rooms, one dedicated theater room, the other a dedicated dinning room, do you guys think I would be better off not separating the room into two, and instead possibly building a half wall approx 4' to 6' tall with the dinning room behind that wall so as to help with the reflections off the back wall?