On 30/04/2017 at 10:57 AM, Stevesie said:

If the canvas is actually slightly reflective, I would imagine it would be at higher frequencies only(but you'd need to confirm with tests) and could actually be better in certain rooms where you don't want to absorb the highs as much. So, could be better or worse, but wouldn't assume either way.

 

I haven't used the Autex, but just thought I'd add my experience with the Martini. If you contact Martini they will let you know where you can get them. Bunnings also sell a version of it now https://www.bunnings.com.au/csr-martini-absorb-xhd-r1-5-2400mm-x-1200mm-x-50mm-17-28m2_p0811175 (6 sheets in that pack) There's a big thread around here somewhere discussing them. You'd cover them like you were going to with the framed Autex, and print on that covering, but if you are trying to save money and can handle a slightly less sharp edge, you can get away without using the timber frame. You could also possibly use a heavy posterboard or similar from an art supplier to make a rigid edging.

 

Canvas is too tight weaved, hold up to light and if you can SEE thru it, its generally a good acoustically transparent device, which of course you need to have the absorbative material actually work.

Velocity is zero at the wall, so a small air gap is better, it will also let you control lower frequencies.

 

I also recommend diffusion, there is some really good stuff on the market but it often out of the reach price wise of the enthusiast.

Do some research on MLS Multiple Length Sequence, we have 2 panels that deploy this practice, everytime we use these two panels we get great results.

The other acoustic device is a Schroder diffuser, or changing reflection diffuser. These are ideal.

 

 

1 hour ago, Wavetrain said:

 

Canvas is too tight weaved, hold up to light and if you can SEE thru it, its generally a good acoustically transparent device, which of course you need to have the absorbative material actually work.

Velocity is zero at the wall, so a small air gap is better, it will also let you control lower frequencies.

 

I also recommend diffusion, there is some really good stuff on the market but it often out of the reach price wise of the enthusiast.

Do some research on MLS Multiple Length Sequence, we have 2 panels that deploy this practice, everytime we use these two panels we get great results.

The other acoustic device is a Schroder diffuser, or changing reflection diffuser. These are ideal.

 

 

did you attach the wrong picture? - that's a Helmholtz pressure trap, not a Schroeder diffuser?

1 minute ago, almikel said:

did you attach the wrong picture? - that's a Helmholtz pressure trap, not a Schroeder diffuser?

correct

Just finished mounting the absorber panels and Arqen diffusers on the front wall.  The panels hang about 100mm in front of the sliding doors giving an air gap behind and because they are hung from the roller blinds they are easy to remove if required.  The before and after photos are below.  The corner trap construction is described on page 7 of this thread.

 

 

 

The Arqen panels are styrofoam coated with 3 coats of PVA glue then painted to harden up the surface and reduce absorbtion.  I colour matched the material from the corner traps and my wife chose the blue colour.  I have no taste apparently so I let her choose the blue - it was political mastery - she is now impressed with my room and thinks it's wonderful!  

 

The absorber panels are 2 x 50mm thick and faced with 50mm acoustic foam tiles giving a total depth of 150mm.  Because the panels are self supporting, I only needed a light weight frame to be able to hang them from the roller blind using cable ties.  I used 3mm MDF and plastic corner moulding to glue it all together with Liquid Nails.  No actual nails or screws were harmed during the construction of the panels.  Overall I'm pretty happy with the result and will have to get to work on the side wall panels next week.

 

   

 

On 18/11/2017 at 4:04 PM, Bilbo said:

Just finished mounting the absorber panels and Arqen diffusers on the front wall.  The panels hang about 100mm in front of the sliding doors giving an air gap behind and because they are hung from the roller blinds they are easy to remove if required.  The before and after photos are below.  The corner trap construction is described on page 7 of this thread.

 

 

 

The Arqen panels are styrofoam coated with 3 coats of PVA glue then painted to harden up the surface and reduce absorbtion.  I colour matched the material from the corner traps and my wife chose the blue colour.  I have no taste apparently so I let her choose the blue - it was political mastery - she is now impressed with my room and thinks it's wonderful!  

 

The absorber panels are 2 x 50mm thick and faced with 50mm acoustic foam tiles giving a total depth of 150mm.  Because the panels are self supporting, I only needed a light weight frame to be able to hang them from the roller blind using cable ties.  I used 3mm MDF and plastic corner moulding to glue it all together with Liquid Nails.  No actual nails or screws were harmed during the construction of the panels.  Overall I'm pretty happy with the result and will have to get to work on the side wall panels next week.

 

   

 

any acoustic treatment is better than nothing, are you hearing subtle differences?

@Wavetrain

There is a slight improvement in the mid bass and better imaging.

Though the panels were previously leaning against the wall once I mounted them properly with the air gap behind it has improved things.

9 hours ago, Bilbo said:

@Wavetrain

There is a slight improvement in the mid bass and better imaging.

Though the panels were previously leaning against the wall once I mounted them properly with the air gap behind it has improved things.

Yes, soon as you have the absorber slightly off the wall, it lowers the frequency target, also velocity is zero at the wall surface, nothing really happens there, the party starts just out from the wall surface.

Nice work

On 18/11/2017 at 5:04 PM, Bilbo said:

Just finished mounting the absorber panels and Arqen diffusers on the front wall.  The panels hang about 100mm in front of the sliding doors giving an air gap behind and because they are hung from the roller blinds they are easy to remove if required.  The before and after photos are below.  The corner trap construction is described on page 7 of this thread.

 

 

 

The Arqen panels are styrofoam coated with 3 coats of PVA glue then painted to harden up the surface and reduce absorbtion.  I colour matched the material from the corner traps and my wife chose the blue colour.  I have no taste apparently so I let her choose the blue - it was political mastery - she is now impressed with my room and thinks it's wonderful!  

 

The absorber panels are 2 x 50mm thick and faced with 50mm acoustic foam tiles giving a total depth of 150mm.  Because the panels are self supporting, I only needed a light weight frame to be able to hang them from the roller blind using cable ties.  I used 3mm MDF and plastic corner moulding to glue it all together with Liquid Nails.  No actual nails or screws were harmed during the construction of the panels.  Overall I'm pretty happy with the result and will have to get to work on the side wall panels next week.

 

   

 

 That is an incredible looking room, the grandkids will have a ball in there! Great stuff

 That is an incredible looking room, the grandkids will have a ball in there! Great stuff

Yeah we'll done. Ive built my panels, just waiting on acoustic art fabric to arrive...yay

Yeah we'll done. Ive built my panels, just waiting on acoustic art fabric to arrive...yay

Yeah we'll done. Ive built my panels, first 3 have been wrapped.

Those panels are very cool - makes mine look quite daggy!!

Those panels are very cool - makes mine look quite daggy!!

The prints are awesome, they would make any frame look cool. :-) I've learnt allot in this process. If anyone needs acoustic panels made, I'm happy to offer my services. I might be starting to make these to sell.

G'day @Perth.hifi

Your panels look great. Just wondering where you got the acoustic art fabric printed and the approximate cost?