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Multi-Way Conventional loudspeakers with crossovers

which type of stuffing?
which type of stuffing?
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Old 9th September 2002, 05:52 PM   #1
RobWells is offline RobWells  United Kingdom
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Default which type of stuffing?

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
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Old 9th September 2002, 07:31 PM   #2
alfsch is offline alfsch  Germany
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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
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Old 9th September 2002, 08:22 PM   #3
RobWells is offline RobWells  United Kingdom
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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
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Old 9th September 2002, 08:31 PM   #4
planet10 is online now planet10  Canada
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which type of stuffing?
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
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Old 9th September 2002, 09:14 PM   #5
RobWells is offline RobWells  United Kingdom
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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
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Old 9th September 2002, 09:33 PM   #6
planet10 is online now planet10  Canada
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which type of stuffing?
Quote:
Originally posted by RobWells
They're well respected in the UK, but I'm trying to get more opinions from people in the rest of the world too!
I bought a lot of stuff from them when i was in University.

Quote:
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.
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?)

Quote:
What about fibreglass? (loft insulation) - that would not sag in the enclosure..
Works well

Quote:
Will the braces stop the wool from settling? or a mixture of wool and loft insulation?
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
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Old 9th September 2002, 09:44 PM   #7
RobWells is offline RobWells  United Kingdom
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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..
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Old 9th September 2002, 09:52 PM   #8
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which type of stuffing?
Quote:
Originally posted by RobWells
You went to uni here? - where abouts?
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
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Old 10th September 2002, 05:39 PM   #9
RobWells is offline RobWells  United Kingdom
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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
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Old 10th September 2002, 06:15 PM   #10
planet10 is online now planet10  Canada
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which type of stuffing?
Quote:
Originally posted by RobWells
[B]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.
The Canadian dollar was a lot stronger 27 years ago (it was actually worth more than the US dollar).

Quote:
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.
That would be cool. Mail me from the button below and i'll send you my address.

dave
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