Serge Auckland wrote:

Anyway, Keith, room treatment:- As I may have mentioned before my feed
was so rudely interrupted, I treated my listening room with great
success (hard to find though, Great Success, padding would have been
easier) Used Acoustic Grade rockwool, and covered it with a linen
curtain for domestic harmony. I'll be pleased to help/advise if you
want to go that route.

How thick does it have to be, and what's the scoop with compressing it a
bit? With suitable holdy-togethery things, could it be formed into panels
that would fit behind the canvasses of oil paintings?


--
Wally
www.wally.myby.co.uk
If it ain't broke, fix it until it is.

Wally wrote:
Serge Auckland wrote:

Anyway, Keith, room treatment:- As I may have mentioned before my feed
was so rudely interrupted, I treated my listening room with great
success (hard to find though, Great Success, padding would have been
easier) Used Acoustic Grade rockwool, and covered it with a linen
curtain for domestic harmony. I'll be pleased to help/advise if you
want to go that route.

How thick does it have to be, and what's the scoop with compressing it a
bit? With suitable holdy-togethery things, could it be formed into panels
that would fit behind the canvasses of oil paintings?


I used 70mm thick panels. These have an absorbtion coefficient of 1.00
above 500Hz, and 0.3 even as low as 125Hz. They would work even better
at the bottom end if you can space them 150mm from the wall. I didn't
have the space to do that, and anyway, I was trying to stop mid/high
frequency reflections. My bass problems are below 80Hz, and rockwool
won't help much that low. Thicker panels, say 100mm, would be a little
better at the bottom end, but I didn't think the extra weight, cost, and
difficulty in handling (100mm panels are pretty heavy) was worth the
marginal improvement.

Canvasses of oil paintings would be a very bad thing, as they would
reflect the treble and not pass it through into the rockwool for
absorbtion. You really need to have the rockwool bare, or covered in a
light cloth that doesn't reflect the higher frequencies. You can achieve
reasonably attractive results using a perforated covering, that has,
say, 80% open space, but it won't look like a solid surface.

Compressing the Rockwool is difficult, it's not very compressible at
all, and I don't see the point of trying. By the way, the nice thing
with rockwool, as opposed to glass-fibre, is that it doesn't cause itching.

Good luck

S.

"Serge Auckland" wrote

Finally got my Newgroups back! Tiscali finally admitted they had a server
problem and fixed it:- Only took them a month....


Hi Serge, I wondered where you had gone!!



Anyway, Keith, room treatment:- As I may have mentioned before my feed was
so rudely interrupted, I treated my listening room with great success
(hard to find though, Great Success, padding would have been easier) Used
Acoustic Grade rockwool, and covered it with a linen curtain for domestic
harmony. I'll be pleased to help/advise if you want to go that route.



That's very kind (and quite typical) of you Serge, but I don't envisage
anything more then a few strategic 'tapestries' here and there atm. (For
tapestries read cheap, thin, 'Turkish' style carpets!!) The rockwool idea is
a good one but a bit 'structural' for me!!


In your room, I think it would be pretty beneficial.


Yes, the plots that Don has done from a couple of Open Mic recordings are
busier than popcorn on a hotplate!! (Time for action!!)

Serge Auckland wrote:

Used Acoustic Grade rockwool

Where did you get it and which grade(s) ?

Graham

Eeyore wrote:

Serge Auckland wrote:

Used Acoustic Grade rockwool

Where did you get it and which grade(s) ?

Graham

I got it from my local Builders' Merchant, Jewsons. The stuff I used is
called Acoustic Partition Slab 67. Specs can be found at:-

http://www.rockwool.co.uk/graphics/R...ition_Slab.pdf

Rockwool make a variety of acoustic products, but most are geared to the
professional installer who wants a quick solution, preferably one
pre-finished, even if the performance isn't the highest. By using slabs
of the rockwool normally intended to be inserted between plasterboard
partitions, you get better absorption and a lower cost, but you have to
cover it yourself:- I used thin linen curtains from IKEA.

If you can't get APS67, Rockwool's conventional RW3 75mm panel will work
almost as well. It has a slightly lower absorption coefficient at the
high treble, but I can't imagine it would be enough of a difference to
matter much. RW6 is just too heavy to handle easily.

I lined the wall behind the 'speakers, from floor to ceiling. In a
conventional rectangular room, I would also go round the sides towards
the listening position about half-way to the listening seat. Ideally, I
would also line he ceiling to the same depth as the side wall, but
domestic considerations may rule that one out.

S.

"Don Pearce" wrote in message
...
On Mon, 02 Oct 2006 12:37:07 +0100, Eeyore
wrote:



"Dave Plowman (News)" wrote:

In article ,
Eeyore wrote:
If Keith wants to capture the sound he hears, the mic should be
positioned in his listening position.

It's not that simple, unfortunately. The brain is a very complex
computer
which filters out unwanted information, etc. As has been said you can
help
matters by closing off one ear to give a better approximation of a
microphone. But for best results you want to do your measuring in a
suitable place - which would be an anechoic room with no reflections or
unwanted noises.

Which would once again defeat the purpose !

Graham

Depends what your purpose is. Whatever way you look at it, Keith's Exe
speaker gives results in his room that I would find intolerable. But
if you are trying to sort out what your speakers are doing, it is as
well to separate them as far as possible from the effects of the room
- that would be a problem for another day.



The great outdoors us the poor man's anechoic chamber - a good
place to do speaker measurements. Dense forest is excellent.

Recording from speakers, especially from the listening pisition in
most domestic environments is rarely satisfactory.

Iain