I was thinking of making some experimental boxes to try out diffrent speaker
unit combinations. Sonotube seems a useful idea with a top/bottom or front/back
in my case. Anyone used it and can report on its acoustical properties? Andy

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

Andy Evans wrote:
I was thinking of making some experimental boxes to try out diffrent speaker
unit combinations. Sonotube seems a useful idea with a top/bottom or front/back
in my case. Anyone used it and can report on its acoustical properties? Andy

The UK equivalent seems to be http://www.essextubes.com
I haven't tried it yet.

In article ,
Andy Evans wrote:
I was thinking of making some experimental boxes to try out diffrent
speaker unit combinations. Sonotube seems a useful idea with a
top/bottom or front/back in my case. Anyone used it and can report on
its acoustical properties? Andy

You certainly seem to be searching for something, Andy. Do you know what
it is? ;-)

--
*Laugh alone and the world thinks you're an idiot.

Dave Plowman London SW
To e-mail, change noise into sound.

You certainly seem to be searching for something, Andy. Do you know what
it is? ;-)

Yep - a simple non-resonant enclosure that I can try out some units in. I'm
going to start with 5" units in a 2-way. I have KEF B110 and some alu cone
speakers coming. Curious about Morel MW144 and one or two of the SEAS excels. I
have a few tweeters, inc. Decca Ribbons. I was thinking of a square alu front -
1/4 ins say - the sonotube behind it (probably 12"dia, and 12" front to back to
give 20litres - ish) and a square of something on the back. Held together on
the outside by four long bolts front to back. I would like to get some sand
into the proceedings, possibly a longer tube with twin walls and sand between,
but a simple box will get me going.

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

Phoned Essextubes, and they have 12" dia in 6mm to 15mm thick. The 15mm sounds
rather useful.

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

In message , Andy Evans
writes
Phoned Essextubes, and they have 12" dia in 6mm to 15mm thick. The 15mm sounds
rather useful.

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

Do they sell to private individuals?
--
Chris Morriss

Do they sell to private individuals?

Yes indeed. The off the shelf units are 6mm thick, and cost about £40 for
lengths of one or two metres delivered - that's for 12" dia. They also do 10"
dia, so the cool thing would be to put sand in between. Sandwich between a
front plate and back plate, tighten up four threaded rods at the corners and yu
have yur speaker. that wasn't difficult!

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

"Andy Evans" wrote in message


I was thinking of making some experimental boxes to try out diffrent
speaker unit combinations. Sonotube seems a useful idea with a
top/bottom or front/back in my case. Anyone used it and can report on
its acoustical properties? Andy

I have several friends who have used Sonotube in various configurations. One
made a tower by slitting a sonotube and bonding a wooden mounting plate to
the side of the tube. Others have added tops and bottoms and used them as
subwoofer enclosures with the woofer mounted on one end.

http://www.lungster.com/l/speakers/sonotubefaq.html

http://kahuna.sdsu.edu/~tucker/diyaudio/diyaudio.html

http://www.passdiy.com/pdf/el-pipe-o.pdf

IOW search google yourself...

Does anybody know the effects of back radiation on the cone. The simple method
of dealing with this is to stuff behind the speaker, or indeed to have cabinets
with odd dimensions to avoid standing waves. But I'm thinking that the actual
length of enclosure behind the cone is important. Hence my plan was to use a
larger diameter sonotube horizontally, rather than a slim one vertically.

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

On 17 Nov 2004 14:34:27 GMT, ohawker (Andy
Evans) wrote:

Does anybody know the effects of back radiation on the cone. The simple method
of dealing with this is to stuff behind the speaker, or indeed to have cabinets
with odd dimensions to avoid standing waves. But I'm thinking that the actual
length of enclosure behind the cone is important. Hence my plan was to use a
larger diameter sonotube horizontally, rather than a slim one vertically.

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

Sound really doesn't know much about whether it is going vertically or
horizontally - so no problem there.

If this is for a subwoofer, standing waves inside the cabinet simply
aren't going to happen - the dimensions are far too small. They will
happen in the room, though, which is a vastly bigger problem.

But how do you propose to use the tube? There are really three ways.
The first is to simply use it as a cabinet, that just happens to be
round. The standard calculations apply, and you can make it sealed for
best sound or ported for maximum oomph.

Second, you could use it as a transmission line, with enough padding
to absorb the entire back wave along the length, resulting in an
effectively infinite baffle - a little like the response of designs
used by me (built into a huge unused concrete cupboard) or Stewart
(into a roof void). This is another maximally flat design that yields
true bass extension without all the bloated thud of the typical home
theatre speaker.

Thirdly, you can make it a half wave long at Fs and pad it lightly
enough that some energy emerges from the far end to prop up the bass
response a bit. It will be good for movies, but not so great for
music.

d

Pearce Consulting
http://www.pearce.uk.com