Hello again Chaps,
The story so far - main bass unit 120L per cab, with seperate mid/treble above.
Unit to be elipsical in shape (flat front, rounded sides to rounded point at rear)
2 x scanspeak 8565-01 per cab.
Can either get BAF wadding 914mm wide x 40mm thick bonding acetate fibre
or Lambswool (Sold in 120 gram packs - enough for a volume of up tp 20 litres )
Which is better, and how much do you reckon I'd be needing considering the units will be sealed? - the reason I ask is that it'll be hard to get the wadding back out once its assembled - I'm making it out of layers one on top of the other hence no removable panel for access..
Cheers for any advice🙂
Rob
The story so far - main bass unit 120L per cab, with seperate mid/treble above.
Unit to be elipsical in shape (flat front, rounded sides to rounded point at rear)
2 x scanspeak 8565-01 per cab.
Can either get BAF wadding 914mm wide x 40mm thick bonding acetate fibre
or Lambswool (Sold in 120 gram packs - enough for a volume of up tp 20 litres )
Which is better, and how much do you reckon I'd be needing considering the units will be sealed? - the reason I ask is that it'll be hard to get the wadding back out once its assembled - I'm making it out of layers one on top of the other hence no removable panel for access..
Cheers for any advice🙂
Rob
Hi,
from my exper. id say, wool is better in midrange-damping, the white synthetic (acetat?) is far better in reducing resonances in the low/bass range, so : whats the crossover frequ.?
greetings
alf
from my exper. id say, wool is better in midrange-damping, the white synthetic (acetat?) is far better in reducing resonances in the low/bass range, so : whats the crossover frequ.?
greetings
alf
Hi Alf - thanks for the response🙂
The crossover frequency is approx 300Hz from the bass to midrange, and approx 2000Hz from mid to tweeter. The mid will be in its own 7 Litre enclosure, with the tweeter in its own enclosure above that....
The drivers will be phase aligned...
Cheers
Rob
The crossover frequency is approx 300Hz from the bass to midrange, and approx 2000Hz from mid to tweeter. The mid will be in its own 7 Litre enclosure, with the tweeter in its own enclosure above that....
The drivers will be phase aligned...
Cheers
Rob
I still haven't equated BAF to anything i use.
I'd use a mix of the wool and pillow stuffing (dacron wool). The wool provides the majority of the damping, and the dacron keeps it from collapsing. You can also pull or add this thru the driver holes after it is sealed up.
dave
I'd use a mix of the wool and pillow stuffing (dacron wool). The wool provides the majority of the damping, and the dacron keeps it from collapsing. You can also pull or add this thru the driver holes after it is sealed up.
dave
Hello again, Dave
I have read of many people using wool, but not of many using the BAF stuff. - The supplier I'm using - http://www.wilmslow-audio.co.uk/ - have recommended the BAF.
They're well respected in the UK, but I'm trying to get more opinions from people in the rest of the world too!
The other prob is how much? I'd have gone for about 50% fill and looking in the loudspeaker cookbook seems to suggest that it does'nt make a huge difference.
What about fibreglass? (loft insulation) - that would not sag in the enclosure..
The more I seem to get near starting this build, the more questions seem to appear.
Will the braces stop the wool from settling? or a mixture of wool and loft insulation?
Cheers
Rob
I have read of many people using wool, but not of many using the BAF stuff. - The supplier I'm using - http://www.wilmslow-audio.co.uk/ - have recommended the BAF.
They're well respected in the UK, but I'm trying to get more opinions from people in the rest of the world too!
The other prob is how much? I'd have gone for about 50% fill and looking in the loudspeaker cookbook seems to suggest that it does'nt make a huge difference.
What about fibreglass? (loft insulation) - that would not sag in the enclosure..
The more I seem to get near starting this build, the more questions seem to appear.
Will the braces stop the wool from settling? or a mixture of wool and loft insulation?
Cheers
Rob
RobWells said:
I bought a lot of stuff from them when i was in University.
I a sealed box you are mostly trying to keep stuff from bouncing around. But you don't want to much because it can make things sound closed in. What you are trying to prevent is stuff coming back thru the cone by converting the sound energy into heat. (with your enclosure standing waves shouldn't be much of an issue -- are you going to leave the inside irregular?)
Works well
To some extent. I like to put a layer of fiberglass insulation or foam on the walls and then dacron or a wool/dacron mix in the middle.
Can anyone tell me what other names BAF goes under and/or describe it. I'm bound to have some having the insides of many many speakers in my salvage.
dave
I'm guessing it is like a loft insulation but made of plastic fibres (acetate) - probably like the pond filter material?
Probably be as good as any other fibre filling?
It looks like I'll just have to buy some and see what it sounds like at the end😀
You went to uni here? - where abouts?
Rob
btw the sides are a mirror image of each other, but I can easily change one arc by a mm or so to make them different..
Probably be as good as any other fibre filling?
It looks like I'll just have to buy some and see what it sounds like at the end😀
You went to uni here? - where abouts?
Rob
btw the sides are a mirror image of each other, but I can easily change one arc by a mm or so to make them different..
RobWells said:
No, i went to Uni (at least the 1st round) in Edmonton, Alberta. But we couldn't get the drivers we wanted to play with (Jordan Watts, Lowther are all i can remember) in Canada so we mail-ordered them.
dave
Cool, I'm just a bit surprised that you bought from the UK - the exchange rates dont make us very competitive to overseas custom, hence my assumption that you were over here studying.
On the BAF front, if you want I can mail a small sample of it over to you when mine arrives, so you can see for yourself what its like.
Cheers
Rob
On the BAF front, if you want I can mail a small sample of it over to you when mine arrives, so you can see for yourself what its like.
Cheers
Rob
RobWells said:
The Canadian dollar was a lot stronger 27 years ago (it was actually worth more than the US dollar).
That would be cool. Mail me from the button below and i'll send you my address.
dave
BAF, maybe Bonded Acrylic/Acetate Fibre??
In Australia theirs a product for House insulation that uses a mix of Wool/Polyester, don't know about elsewhere.
Regards
James
In Australia theirs a product for House insulation that uses a mix of Wool/Polyester, don't know about elsewhere.
Regards
James
Hello James - I think you're probably right! Hopefully the packaging will have some info on it.
Rob
Rob
i have simialr size sub. 2 x 12" SV12 from ACI.
I use a mix of glass wool and poly fill. about 1 kg per cu. ft.
hope this helps
besides you can remove the stuffing by removing the driver. a 10" hole is enough.
cheers
I use a mix of glass wool and poly fill. about 1 kg per cu. ft.
hope this helps
besides you can remove the stuffing by removing the driver. a 10" hole is enough.
cheers
Thanx for the pointer, Navin.
The prob with the box is that I'm using 2 side - side braces, and 3 front to back (horizontally) - I may need very bendy arms to reach to the bottom back😀
I'll only know for sure when it's constructed..
Cheers
Rob
btw - the void free ply thing - your timber merchant should be able to tell you whether it is / isn't. Its a selling point that should put the price up!
The prob with the box is that I'm using 2 side - side braces, and 3 front to back (horizontally) - I may need very bendy arms to reach to the bottom back😀
I'll only know for sure when it's constructed..
Cheers
Rob
btw - the void free ply thing - your timber merchant should be able to tell you whether it is / isn't. Its a selling point that should put the price up!
I use similar bracing "technolgy". You migh not reach the whole box but you can reach enough to make a difference to the sound.
another idea. wrap the stuffing in thin cotton (muslin) cloth and stich handles on the cloth bags. then you can remove these bags. there is a trade off though. small bages means too many bags. large bags means you can onyl adjust in large steps. you cam mix though. put the bags in the back.
hope this helps.
another idea. wrap the stuffing in thin cotton (muslin) cloth and stich handles on the cloth bags. then you can remove these bags. there is a trade off though. small bages means too many bags. large bags means you can onyl adjust in large steps. you cam mix though. put the bags in the back.
hope this helps.
Hello Navin,
I've got to the point on the cad where I can see how it's gonna look - have changed plan slightly so that I am using a full baffle, top to bottom, as it would have looked a bit wrong otherwise.
I reckon I'll have no probs accessing the stuffing!
Cheers
Rob
I've got to the point on the cad where I can see how it's gonna look - have changed plan slightly so that I am using a full baffle, top to bottom, as it would have looked a bit wrong otherwise.
I reckon I'll have no probs accessing the stuffing!
Cheers
Rob
planet10 said:
I can sort some shots out tomorrow but be warned!😀
We work in 2D, not 3 so they'll not make as much sense as a nice autocad shot! - you'll see the layers from the top, and a roughish front shot of the baffle superimposed on the front type thing!
The cad system we use is designed for die-making, and purely for sorting out a laser to burn layers, rather than 3d stuff - It makes sense to me as I've designed it as such....
I'll do my best anyway......
Rob
😀 I dont really know much about other cad systems to be honest, just the one I use at work......I used autocad as it seems to be the industry standard in the UK........
Its been a long time since I heard "oxymoron" in everyday conversation though - takes me back to english lit. at college..hehe....
Rob
Its been a long time since I heard "oxymoron" in everyday conversation though - takes me back to english lit. at college..hehe....
Rob
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