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Originally Posted by terry j  Now the value of the above 200 hz RT60 looks to be between 0.3 and 0.4 ms, so call it 0.35 ms. Given that it is a largish room as far as most peoples room sizes go, is that a good value? In other words, what target would we aim for as a general rule, and how does my value compare?
Do we go for a different value in the sub 200 hz region or aim to keep it the same across the boards? (just trying to understand here) Example, let's say that we had an even but 'non-optimum' RT60 value, sonically would it be better to have an even non-optimum measurement across the entire range, or better to get the best we can in any range and sacrifice the evenness. |
There's a graph in the master handbook of acoustics that looks something like this:
With a bump in the low end and a dip in the high end. While I think you can safely assume that some bass will boom more than the rest of the range, striving for a flat'ish RT in the high end is not bad goal. At least make sure it's not totally dead. Going for a flat low end can't hurt either, if it's possible!
http://www.santafevisions.com/csf/im..._time_freq.gif
Though, I think there's something positive to having a dip in the high end. If the goal is to create an illusion of a room much bigger than what it really is, a dip in the high end RT is to expected from such a large room.
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Originally Posted by terry j obviously I have been thinking about my next step (serious bass trapping) and that again led me to the back corner alcove, where it is feasible to place a very large diffusor with the aim to diffuse down to about 150 hz or so.
Lupo reckons it's not a silly idea, but technically ARE there any limits or reasons to try to go that low?? Can I get that answer wrapped up if possible? That helps decide what goes there, bloody big hulkin diffusor or a bloody big hulkin bass trap. |
I think you'll get better room performance with a big bass trap instead of a big diffuser. If you get the low end tight enough and still have room to build deep diffusers, they certainly won't hurt. But bass trapping should be your first priority, IMHO.
Disclaimer that goes with all these posts: I'm a DIY'er with a keen interest for acoustics. But I'm not even close to being an expert on the subject!
Cheers,
Andreas