Tuba 60 lab 12 slim build

[BoostFab]

And by tight i meant no vibrations, all acoustic energy comes in the form of sound instead of being absorbed by the wood as vibrations. Just a lil extra precaution as i know the pressures of the t60 must me immense!

air tight meaning, you to use the PL glue to where no air gap in your joints. you don't need to add any damping inside the horn path. bill design the horn to be very rigid... just follow the plan with proper bracing and you're fine. just use duratex on the outside for a professional finish.

btw! someone can clearify this, but wouldn't using damping compound in the horn path causing decrease in sound efficiency?

[Dave Non-Zero]

He means to use it as an outer covering I'm guessing.

[DJPhatman]

" It is an air curing, water-based, exterior grade damping paste, which has been engineered specifically for use as an undercoating in various automotive applications and is non-toxic and environmentally safe. This unique combination of silica-mica, ceramics and an advanced chemical binder greatly reduces structural resonance by converting vibration into "viscous" friction or low level heat. Once the purple liquid coating is dry it is a waterproof, very hard film-type abrasion resistant coating, with a black speckled finish."

Apparently its not a tar, i dunno if were lookin at the same stuff tho. lemme try the link again
http://www.parts-express.com/pe/showdet ... er=268-256

Damping paste, meaning that it absorbs sound, not reflects it. This is the stuff used to prevent body panel flexing in automotive installs. There is absolutely no use for it in, or on, a sub. A T60, when built to the plans, will not vibrate or flex it's panels, due to the internal bracing.

[chunkymunkey_1]

Well i think its a good idea, its the same price as duratex plus vibration dampening. Does nobody else see ANY advantages to this? Anyway, i got my 1/2" BB today and laid out the first side, i'll cut all my parts tmw! Woot!

[chunkymunkey_1]

and it reflects sound and absorbs vibration...big difference.

[UROK]

You have found a non solution to a problem that didn't exist in the first place! There is tons of info on the forum about why Duratex beats other finish options. If you want to be unique get the Duratex colored???

[chunkymunkey_1]

i dont want to be unique, i want better results. How do you know its not better if you have never tried it or even heard of it? i'm a perfectionist, soo if theres something better i'm using it.

[BoostFab]

i dont want to be unique, i want better results. How do you know its not better if you have never tried it or even heard of it? i'm a perfectionist, soo if theres something better i'm using it.

since you already made your mind on it, let's get-er-done... and tell us the result.

[UROK]

+1

There is a Chinese story about an artist who painted a perfect representation of a snake. It looked so full of life it might crawl off the paper. Not satisfied though, the artist, seeking perfection, proceeded to add four legs.

[Tom Smit]

i dont want to be unique, i want better results. How do you know its not better if you have never tried it or even heard of it? i'm a perfectionist, soo if theres something better i'm using it.

Better results you will have not! Unnecessary spendage of money.
BFM cabs are NOT designed /constructed like conventional cabs. Period. There were vibrations issues in the cabs(maybe), then Bill fixed those issues, and THEN released the plans.

[LelandCrooks]

You're fixing a non existent problem in a sub, at least in a horn sub. It cannot absorb frequencies in any range that a sub will reproduce. The wavelengths are just too long. What you're looking at is probably very good for cars, any type of thin material that needs mass added to stop flex. The stiffness it will add to 1/2 bb or a good 1/2 ply is less than miniscule. It doesn't appear to be formulated for an exterior finish, but hey, give it a go if you want.

Duratex makes a similar product that builds very quickly, is light, and actually can absorb reflections in top boxes. But it's also totally pointless in a sub.

[jswingchun]

i dont want to be unique, i want better results. How do you know its not better if you have never tried it or even heard of it? i'm a perfectionist, soo if theres something better i'm using it.

Bill designs these cabs the way he does for a reason. He has worked out all the details so the rest of us mere mortals don't have to guess at stuff and try to make them better. Stick to the plans!

[quaizywabbit]

Well i think its a good idea, its the same price as duratex plus vibration dampening. Does nobody else see ANY advantages to this? Anyway, i got my 1/2" BB today and laid out the first side, i'll cut all my parts tmw! Woot!

If you're installing the cab in a truck or van, then by all means slather this stuff where needed to keep it from shaking apart.....

[DJPhatman]

and it reflects sound and absorbs vibration...big difference.

Sound is vibration. No sympathetic vibrations are wanted inside the horn path. Braces, spaced no more than 8" apart, solve any issue there.

Well i think its a good idea, its the same price as duratex plus vibration dampening. Does nobody else see ANY advantages to this? Anyway, i got my 1/2" BB today and laid out the first side, i'll cut all my parts tmw! Woot!

If it had any advantage, it would have been included in the plans. Bill's designs have been used very successfully for quite some time now. And, the product you listed is more expensive than DuraTex, by over US$10 per gallon. Add to the equation that DuraTex is an externally applied speaker enclosure covering, and the Cascade is a dampening material, designed to reduce, or dampen, automotive panel flexing (sheet metal) by applying it to the inside of the panels. Just so you know, it never hardens, as it would chip and crack off the sheet metal as it naturally flexes.

i dont want to be unique, i want better results. How do you know its not better if you have never tried it or even heard of it? i'm a perfectionist, soo if theres something better i'm using it.

Are you a sound/acoustical engineer? Do you have any experience designing, modeling, researching, engineering, etc, a horn-loaded subwoofer enclosure? Bill has been doing this for a long time, has the degree, has the experience, and has been published. No offense, but I, personally, will bow to Bill's expertise.

Oh, and BTW, what makes you think that dampening material hasn't been used/tested, and it's NFG for this application? If anyone had used it with success on the forum, there would be a positive posting.

[Bill Fitzmaurice]

Oh, and BTW, what makes you think that dampening material hasn't been used/tested

It has been tested, it doesn't work.