If it helps I just ordered some of this for an upcoming build: Swaledale 54 Pure Wool Carpet Underlay.
What I am using is designed as a pad for placing under area rugs. It is supposed to be a blend of synthetic and real wool felt. I haven't confirmed for sure if this felt is made from lamb's wool or not but it does work VERY well. I glued it to all inside walls of my current build and it does dampen quite well. Maybe for a transmission line, horn or more sophisticated box design; 100% wool felt "MAY" make some sonic improvements!!???. In the case of a standard bass reflex (vented), closed box or Aperiodic closed box; I doubt seriously if anyone can tell the difference!
Cushioned Area Rug Pad — Nance Industries
I found this on Wayfair.com
The description says felt and synthetic materials. The problem with Wayfair is they don't always stock the same things and change suppliers, products, etc. often. My exact pad that I just recently purchased isn't even showing up on their site right now. In general, do online searches for rug pads that contain wool felt; you should be able to locate something similar to what I have.
Good find! In my short searching online in the USA; I kept find 100% wool felt to be way over priced for my purposes. That's when I discovered the synthetic/felt blend. In either case; it looks like this is the way to go; get carpet or rug underlayments or pads cheaper than purpose made felt. Same thing I do with stuffing. I buy poly' fill from hobby stores online designed for stuffed toys, pillows and such. Probably every bit as good as the purpose made stuff at a much cheaper price!
I have pure wool felt as well as some automotive under felt I bought from my local auto trimmer, which is a blend of wool and synthetic. I use the blend now on the front baffle and between the Alpiar 12P and woofer cabinet. The difference is measurable with REW. and audible, fine detail improves, so the felt is attenuating baffle reflections.
Your Path parameter value should be the length of the shortest acoustic path between the two outputs - see Help file.
The value would only be zero if the two sound sources were co-located.
Thanks for the reminder - I was looking for that to fix it and I couldn't remember where it was.
EDIT: To be clear, I still can't remember where to set that.
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OK, found it! And...it smooths out the top a lot, which is good to see, but I was mostly interested in the bottom corner anyway.
EDIT: Swapped out the image to one that shows the effects of stuffing just in case people want to comment on that...
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Quite close.
As designed. I don't normally do a maximally flat (or near max-flat) alignment, but this box was created as a simple, large, relatively low-tuned MLTL with less forcing than most use for a similar Fb.
Cool. While I'm doing questions on Sea Stack:
Is this the final (metric) drawing? I don't think I've ever found it linked here but it's what Google turns up: http://www.wodendesign.com/downloads/SeaStack-A11ms-MLTL-010918.pdf
Would you recommend building it with a doubled baffle like the Water Buffalo drawing?
Are there any photos / sketches / guides for the suggested bracing?
Thanks Scott!
You might find it interesting / educational to contemplate "Water Buffalo", a shorter, lower volume MLTL with a longer port: https://www.diyaudio.com/forums/ful...io-fostex-tb-dayton-seas-etc.html#post5554180
Because those vent dimensions provide the target alignment. You can change it, but in doing so you move it away from the alignment I designed the enclosure to have. The objective for this box was to provide people with the option of a relatively large design with less forcing than is usually the case.