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[princetown]

Hi all,if a room is 26 feet long ,what is the distance from the front wall to your seated monitoring position ?i read somewhere that it is 33% of the room length?

princetown

[jimmyjazz]

There is a rule of thumb that came out of some modal calculations which says 38% of the distance from the front or back wall provides the "smoothest" low frequency response.  I believe the assumptions were that the room is rectangular and that the listening position is centered between the lateral walls as well as the floor & ceiling.  Your mileage may vary.

[franman]

yeah.. what JJ says. It's not quite that simple, but in a free-standing or 'mastering' type application it's certainly a good starting point to start evaluation.

It is possible to calculate the optimal positioning based on Modal and SBIR patterns. RPG actually makes some cool software that does just that. Of course, you have to know what it all means??    

FM

[AndreasN]

Am relatively new at acoustics. So far, the RPG room optimizer seems to work surprisingly well! Even in rooms without totally reflective surfaces, predictions are usually close enough to provide a good starting point. Have only tested a few rooms though.

Am curious how the professional experiences have been with it. Are you using it to provide a starting point?

[Thomas Jouanjean]

AndreasN wrote on Mon, 01 February 2010 10:20

Am relatively new at acoustics. So far, the RPG room optimizer seems to work surprisingly well! Even in rooms without totally reflective surfaces, predictions are usually close enough to provide a good starting point. Have only tested a few rooms though. Am curious how the professional experiences have been with it. Are you using it to provide a starting point?

I'm not using any of these, but I have tested a couple a while ago now.

When designing the room you pretty much know from the start where your speakers will have to be so you integrate that info into the design and move on. Free standing speakers always move a bit anyway, depending on brand, type... And the one listening to them.

I am sure these softwares are very useful though.

[franman]

Andreas.. I also have found the Room Optimizer program to be surprisingly accurate in reproducing what I actually measure in regular rectangular rooms, once you get the hang of it. It's a good 'tool' to use for us along with other modal modeling systems including proprietary ones. It's all just information and you can't have too much of that!!

FM

[AndreasN]

Glad to hear!

Am way down the food chain, with treatment of existing spaces being the only concern at the moment. Seems to work very well for the purpose. Well worth the $100!

Must admit that I do also get a kick out of watching the program go through half a lifetime of measurements in mere minutes.