- Aug 15, 2020
- Southampton, England
Excellent paper. Concentrated on the speech range but it explains everything you need to know about acoustics of resonators eloquently.
Depending on your room size it is possible that energy absorbed with such small absorber (even though it’s compacted) is not enough to bring down the peaks.
What specifics you want to know further than what I already said on this thread?
I create a rectangle opening (port) and over it slide a flap to change the port area. Once the required frequency is reached I tighten the screws (that are acting like a guide to the flap) to fix the flap in place.How was the variable sized opening achieved?
Yes but large resonators will be less position dependant.Is it best to position the resonators at room corners if possible?
Easiest way to find the room modes is via a manual sweep of sine-wave and watch the frequency reading.I've skimmed throught the paper and have seen equations to calculate the resonant frequency. How does one tune the amount of attenuation? By adding multiple resonators? Is it possible to calculate in advance how many will be needed?
My false ceiling is acoustically transparent at bass frequencies. Most likely a floorboard with carpet on it will not be. As you said though if the port is open to the room then you are good to go. You should be able to have two vents, protruding from the floor, each tuned to a different frequency.You mention having your resonators in the ceiling and false walls. Does the port need to open into the room (so that a hole is visible) or do the bass frequencies pass throught the ceiling with sufficient ease that it doesn't matter.
I have a potential space below wooden floorboards and carpet, perhaps this would attenuate too much and an open vent would be needed?
Then why did you treat your room and buy a top of the line processor and a setup that makes 99% of users here emasculated if ‘Everyone likes bass even if it’s peaky’I respectfully disagree. Reducing the bass energy in a room makes the sound unlikeable. Everyone likes bass even if it’s peaky.
I don’t understand your point. However, I can see that it’s not meant to be nice even though I said I respectfully disagree.Then why did you treat your room and buy a top of the line processor and a setup that makes 99% of users here emasculated if ‘Everyone likes bass even if it’s peaky’
Might as well be happy with a sound bar and a subwoofer.
Yes that was disagreeable ...moving swiftly on...
I don’t lower the Q because I have many separate resonators, each working on a separate frequency. In my room that was a better compromise. (It’s always a compromise.) The main problem with increasing the resistance of the port is the power of the resonator is also reduced, hence you need bigger enclosures.Do you use any wadding to increase absorption within the resonators and lower Q?
I’m afraid I can’t. I do have REW but due to familiarity with other software I am not using it.Assuming you have a microphone and REW too, please show the unsmoothed responses at positions 1, 2, and 3.
It is not simple for me. There is no computer on that room. My computer is a floor stander workstation in a room at the other end of the house and I do not own a laptop.It would be nice to see and pretty simple to do though…
Oh, and I meant to add, show the unsmoothed plot only from 20-300 Hz…
If the person doing the equalizing doesn't know what they're doing, it sure sounds bad.I respectfully disagree. Reducing the bass energy in a room makes the sound unlikeable. Everyone likes bass even if it’s peaky.
Besides, it is not necessary to put any resonator below the schroeder frequency, since with a multisub configuration it is solved.
SteveGTR 9th March 2017I've also tried using MSO (although with only 2 subs). My subjective experience was that by controlling the relative delay of the subs you could smooth out the response a bit but this caused a reduction in the impact of bass. Also MSO suggested too high a level on my rear sub which caused it to be quite localisable. I prefer the bass to come more from the front of the room.
I find that greater bass impact can be achieved by adjusting delays based on the impulse measurements in REW but this can leave peaks in the frequency response (below Schroeder) due to room modes.
The room mode peaks that I see are at the limit of what can be corrected with EQ. If a resonant absorber can bring down those peaks it will likely leave less work for the EQ to do; therefore yielding better results.
(Not an expert on this - just my 2 cents)!
Here is a new room we just worked on...