- Thread Starter
- #41
Cheers! It will be a week+.Awaiting the end result with excitement!
Do you have idea on what frequency can be attenuate by felt only and what frequency need to use MPP? I am thinking is whether 2000Hz a good number there or we can go lower and leave the higher frequency to felt.
Splitting the baffle can attenuate multiple frequencies, but does it make the effect lower because you have less area per frequency range?
I expect the felt to run out of steam around 1-2khz. I went up to 3khz because I wanted to overlap the tweeter's range. Where each section is tuned should shift down with each layer of felt that I add.
I hope to measure over each area of the baffle and see if there is anything to see. Again, my baffle is tiny so this could all be a waste.
https://www.researchgate.net/figure...lt-and-wool-felt-with-membrane_fig4_316773713
That is one view of wool felt. The MPP paper used a plant-based jute felt.
more:
https://www.scirp.org/pdf/OJA_2017061616554618.pdf
https://www.researchgate.net/public...ials_with_Improved_Sound-Absorbing_Properties
https://www.researchgate.net/public...xtile-Based_Waste_for_the_Automobile_Industry
The felt I am using is listed as between f1 and f5. This is the more dense stuff so it should be good for what I need it to do.
http://www.usfelt.com/sae_felt_specs.html
The pics are ripped from the papers. They mostly show different densities of felt and different ways of making it. WHXXX, WM, and CML are all felt.