Kvålsvoll Design Audio Forum

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A waterfall with 300ms range and very short rise-time at 1ms, reveals there are no resonances left, we can also see the excellent early decay attenuation and the later decay tail that is quite unique for Room2:

Comparing Room2 to the Media Room, we see the difference in decay in the 100Hz-500Hz frequency range. Same speakers - F205. This is a result of the insufficient acoustic treatment in the Media Room failing to provide enough absorption in this critical range:

Media Room left, Room2 right:

Even easier to see in the decay graph:

Media Room left, Room2 right.

On a forum page, someone posted this, about how he came to the realization that this dynamic, exciting sound is what he liked most:

because it took me 30 years to understand that the character trait I appreciated the most was the dynamics...

So I added this compressed version of my entire audio journey, it fits in here in the Room2 thread, because the sound in Room2, with the current system with F205+V110 has much of this excitement, and acoustics is also a part of it, sort of:


Makes sense. Took me 5 minutes 40 years ago, to learn there is a fundamental difference, and I liked it. Then I used 30 years to try to find out if I really liked the other type of sound instead..

Funny to look back, 40 years ago I was not that old, barely knew enough to be able to put numbers into a calculator to get very exact numbers for dimensions of ports and crossover components (No, we did certainly not learn that in school..). Then I asked the obvious question - why. If I know why, then I can make this even better. So I figured size matters, because the "right" speakers were considerably larger, much larger, than the typical ones people had around. So I built larger. It did not work. Perhaps they were not expensive enough. So I built even larger, and the best, expensive woofer drivers available. It was better, but still, something was missing. So I lost it there, going for smaller and more complex designs, because now, I knew how to program my calculator.

Interesting, that I also managed to accidentally realize that acoustics matter, from those early days. But there was no knowledge for how to fix it properly, so my first attempts at acoustic treatment using blankets on walls did not work.

I know why, now. It was not size alone, it was not efficiency (because the magnestat panels built in the 80ies were very inefficient, but still had much of the same desired characteristics to the sound).


This is how the room is now, with new F205H prototypes:

Floor reflection boxes:

See the boxes with white blanket on top, on each side of the table? Yes, they are there to change floor reflection. Not because they are necessary or makes a huge impact on sound, just because they are practically viable in this room, and may make a very small difference. With the F205 speakers, they change the frequency response in the midrange slightly, but really has no effect on imaging, due to the very good radiation pattern of the F205.