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build a VPR bass trap.uk
Old 26th September 2012 | Show parent
  #61
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G. E.'s Avatar
 
🎧 10 years
.mdat File

Quote:
Originally Posted by Red Mastering ➑️
... .mdat file ... for some reasons I couldn't upload it here ...
I think the size of the uncompressed .mdat-file exceeded the limit.
Attached Files
File Type: zip red_5.zip (7.88 MB, 108 views)
Old 26th September 2012 | Show parent
  #62
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🎧 5 years
I have a serious hunch that your resonance is being most influenced by the left front corner and the back right corner. Also, the glass doors might have a big impact. Try doing tests with glass door open, and one monitor at a time. I am thinking you will see the most resonance with the left monitor and door shut.
Old 26th September 2012 | Show parent
  #63
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by G. E. ➑️
I think the size of the uncompressed .mdat-file exceeded the limit.
thank you,
any comments on the measurements ?
Old 26th September 2012 | Show parent
  #64
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by OpusOfTrolls ➑️
I have a serious hunch that your resonance is being most influenced by the left front corner and the back right corner. Also, the glass doors might have a big impact. Try doing tests with glass door open, and one monitor at a time. I am thinking you will see the most resonance with the left monitor and door shut.
interesting theory, but
there's no 'right corner', it's trapezoid shape,
the one which is further away - does not boom as much as rest of the room
the doors have a panel on them 120x60x10 cm

the left corner - very possibly,
although when testing, the worst place is left back corner and back wall
the 32Hz ring is there possibly 20dB more then in sweet spot (where is already 15dB over)
I did test just left monitor - you are correct
left monitor creates more 32Hz rumble
I didn't check with doors open - how it could help me ?

big thanks for your input
Old 26th September 2012 | Show parent
  #65
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🎧 5 years
Quote:
Originally Posted by Red Mastering ➑️
interesting theory, but
there's no 'right corner', it's trapezoid shape,
the one which is further away - does not boom as much as rest of the room
the doors have a panel on them 120x60x10 cm

the left corner - very possibly,
although when testing, the worst place is left back corner and back wall
the 32Hz ring is there possibly 20dB more then in sweet spot (where is already 15dB over)
I did test just left monitor - you are correct
left monitor creates more 32Hz rumble
I didn't check with doors open - how it could help me ?

big thanks for your input
Having a null at one side and peak at the other with a mode is very possible. It is probably the lowest mode your room is capable of generating.
Old 27th September 2012 | Show parent
  #66
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by OpusOfTrolls ➑️
Having a null at one side and peak at the other with a mode is very possible. It is probably the lowest mode your room is capable of generating.
I will make a test with doors open tomorrow,
and drop waterfall here
separate left and right monitors

would you suggest to focus on those corners first ?

the one in ....'office area' would be difficult to touch
as my better part already started making fuss about amount of rockwool

thank you very much for idea, I will try to put a lot of panels and bass traps in right back corner (temporary) to check the effects

I forgot to add, that today's test were done with left back corner, super heavy trapped (8 panels and bass trap)
and it did not stop 32Hz rumble even a bit
actually nothing seriously have changed since the previous day where panels were behind the sofa (there were 8 panels behind sofa 120x60x10cm)
now there are only 4, but spaced from back wall (10 cm space)

thanks again
Old 27th September 2012 | Show parent
  #67
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🎧 5 years
Quote:
Originally Posted by Red Mastering ➑️
I will make a test with doors open tomorrow,
and drop waterfall here
separate left and right monitors

would you suggest to focus on those corners first ?

the one in ....'office area' would be difficult to touch
as my better part already started making fuss about amount of rockwool

thank you very much for idea, I will try to put a lot of panels and bass traps in right back corner (temporary) to check the effects

I forgot to add, that today's test were done with left back corner, super heavy trapped (8 panels and bass trap)
and it did not stop 32Hz rumble even a bit
actually nothing seriously have changed since the previous day where panels were behind the sofa (there were 8 panels behind sofa 120x60x10cm)
now there are only 4, but spaced from back wall (10 cm space)

thanks again
It would help to have the dimensions of your room. The door open prevents the sound from returning, acting like a perfect absorber. At most, it will help us figure the effects of that boundary.

There could also be another resonance in something else. But I would like to see the layout before I make any speculations.

Old 27th September 2012 | Show parent
  #68
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by OpusOfTrolls ➑️
.................There could also be another resonance in something else. But I would like to see the layout before I make any speculations.

build a VPR bass trap.uk
on the first page are few photos and also a drawing
I forgot to add doors on left from the sofa
and this is not pro drawing but there are dimensions
plus height is 245cm, 8ft plus 1cm, I think
Old 27th September 2012 | Show parent
  #69
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🎧 5 years
Quote:
Originally Posted by Red Mastering ➑️
build a VPR bass trap.uk
on the first page are few photos and also a drawing
I forgot to add doors on left from the sofa
and this is not pro drawing but there are dimensions
plus height is 245cm, 8ft plus 1cm, I think
The right wall dimension is missing. It is important.
Old 27th September 2012
  #70
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Red Mastering's Avatar
 
🎧 10 years
you mean - where is balcony ?
Old 27th September 2012 | Show parent
  #71
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🎧 5 years
Quote:
Originally Posted by Red Mastering ➑️
you mean - where is balcony ?
The wall that belongs to your significant other, assuming sound dares travel there.
Old 27th September 2012 | Show parent
  #72
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G. E.'s Avatar
 
🎧 10 years
Signal-to-Noise

Quote:
Originally Posted by Red Mastering ➑️
... any comments on the measurements ?
I would like to see a measurement with better signal-to-noise ratio in bass range (that you'll get with higher overall output level, sweeps, averaging, etc.).
Old 27th September 2012 | Show parent
  #73
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by G. E. ➑️
I would like to see a measurement with better signal-to-noise ratio in bass range (that you'll get with higher overall output level, sweeps, averaging, etc.).
hey Germont,
I am not sure what you are asking me for...:/
could you explain, please ?

if it's ok, I'd like to ask you what kind of steel you used in your VPR absorbers ?
all I have found in uk is this :
1mm thick Mild Steel Sheet Free Cutting Service | Nationwide Delivery
and they have sizes which somehow limit the VPR panel
there's no 1.5mx1m for example
how big was a panel you built ?

after some thoughts I am thinking about getting 4-5 smaller panels
let's say 1250mm x 625mm - as those are easier to move around and utilize in small room - but I am more then happy to be corrected

best
Old 27th September 2012 | Show parent
  #74
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🎧 10 years
Quote:
Originally Posted by Red Mastering ➑️
..........
all I have found in uk is this :
1mm thick Mild Steel Sheet Free Cutting Service | Nationwide Delivery
and they have sizes which somehow limit the VPR panel
there's no 1.5mx1m for example
how big was a panel you built ?

.........
I think here you have 1x1.5m, thickness 0.8mm and 1.2mm
Galvanised Mild Steel
It's even galvanized, so you wouldn't have problems with rust
(I'm not in London, this is some of first google search results << click here for others...)
Old 27th September 2012 | Show parent
  #75
Gear Addict
 
🎧 10 years
Quote:
Originally Posted by boggy ➑️
Probably, but Gernot said that this things are already self adhesive...
I think you have to request the special version with adhesive when ordering, I got two boxes of isobond a year ago and it was not with adhesive.
Old 27th September 2012 | Show parent
  #76
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by hsal ➑️
I think you have to request the special version with adhesive when ordering, I got two boxes of isobond a year ago and it was not with adhesive.
yes I am aware of that,
DanDan mentioned it in one of his post
Old 27th September 2012 | Show parent
  #77
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by boggy ➑️
I think here you have 1x1.5m, thickness 0.8mm and 1.2mm
Galvanised Mild Steel
It's even galvanized, so you wouldn't have problems with rust
(I'm not in London, this is some of first google search results << click here for others...)
thank you,
I wasn't googling galvanized steel, but just steel sheet uk
anyway it's roughly 100% more then CR4 mild steel,
there's no 1 mm thickness - but I don't know how important it is,
G.E. claimed 1mm to be the best choice
Old 27th September 2012 | Show parent
  #78
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🎧 5 years
Quote:
Originally Posted by Red Mastering ➑️
thank you,
I wasn't googling galvanized steel, but just steel sheet uk
anyway it's roughly 100% more then CR4 mild steel,
there's no 1 mm thickness - but I don't know how important it is,
G.E. claimed 1mm to be the best choice
Metal Sheets :: Galvanised Steel Sheets
http://www.rowhamsteel.co.uk/productrange.html
http://www.parkersteel.co.uk/Matrix/20/Galvanised+Sheet

correct term when looking for plain sheet or any unfabbed material is 'stock'.

"sheet metal stock"
Old 27th September 2012 | Show parent
  #79
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boggy's Avatar
 
🎧 10 years
Quote:
Originally Posted by OpusOfTrolls ➑️
Metal Sheets :: Galvanised Steel Sheets

correct term when looking for plain sheet or any unfabbed material is 'stock'.

"sheet metal stock"
Thank you


Old 27th September 2012 | Show parent
  #80
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Red Mastering's Avatar
 
🎧 10 years
ok. I did some more testing
separate L and R channel
with doors left open and closed

build a VPR bass trap.uk-l-closed-spl.jpg

build a VPR bass trap.uk-l-closed.jpg

build a VPR bass trap.uk-l-open-spl.jpg

build a VPR bass trap.uk-l-open.jpg

build a VPR bass trap.uk-r-closed-spl.jpg

build a VPR bass trap.uk-r-closed.jpg

build a VPR bass trap.uk-r-open-spl.jpg

build a VPR bass trap.uk-r-open.jpg .mdat file below

and here are photos of the back right corner,
my apologies for a bad quality
on one photo you can see amount of traps put in that corner
I will upload REW measurements after this - but it didn't change a lot
Attached Thumbnails
build a VPR bass trap.uk-imag0063.jpg   build a VPR bass trap.uk-imag0064.jpg   build a VPR bass trap.uk-imag0065.jpg  
Old 27th September 2012
  #81
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🎧 10 years
If I see well, you don't have symmetry in your loudspeaker/listener placement. I recommend to find better place for all.
Old 27th September 2012 | Show parent
  #82
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Red Mastering's Avatar
 
🎧 10 years
L and R.zipsorry .mdat file didn't come through
Old 27th September 2012 | Show parent
  #83
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by boggy ➑️
If I see well, you don't have symmetry in your loudspeaker/listener placement. I recommend to find better place for all.
this is probably an outcome of trapezoid shape of the room:(
right speaker does not have a wall on right
Old 27th September 2012 | Show parent
  #84
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🎧 5 years
Sorry for my confusion, but it was the balcony door that was open, correct?

Okay, in this case I really think the resonance is being caused by something close to the speaker.
Old 27th September 2012 | Show parent
  #85
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🎧 10 years
Quote:
Originally Posted by Red Mastering ➑️
this is probably an outcome of trapezoid shape of the room:(
right speaker does not have a wall on right
Currently this is a bigger problem than your room modes. Try to draw something before you start to "promenade" your IB2s, and this way try to find most symmetrical position. Symmetry is needed mostly because you have two symmetrical ears....
Old 27th September 2012 | Show parent
  #86
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G. E.'s Avatar
 
🎧 10 years
Panel thickness

Quote:
Originally Posted by Red Mastering ➑️
... G.E. claimed 1mm to be the best choice
No, I did not want you to think 1mm is generally the best. I wanted to point out that I would choose two panels with 1mm over 1 panel with 2.5mm if there would be no other VPR-style absorbers in the room.
Old 27th September 2012 | Show parent
  #87
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by OpusOfTrolls ➑️
Sorry for my confusion, but it was the balcony door that was open, correct?

Okay, in this case I really think the resonance is being caused by something close to the speaker.
nono...
I forgot to draw an entry door on left from sofa
I meant those doors, you can see them on photos
but not on a drawing
sorry
Old 27th September 2012 | Show parent
  #88
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🎧 5 years
Considering all the factors here, you will need to sweep more and in more locations.
Old 28th September 2012 | Show parent
  #89
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Red Mastering's Avatar
 
🎧 10 years
Quote:
Originally Posted by boggy ➑️
Currently this is a bigger problem than your room modes. Try to draw something before you start to "promenade" your IB2s, and this way try to find most symmetrical position. Symmetry is needed mostly because you have two symmetrical ears....
hey Boggy,
could you explain it a little more, please ?
I am confused a bit
Old 28th September 2012
  #90
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JP__'s Avatar
 
🎧 10 years
IΒ΄m not boggy nor my english is very good, nevertheless I will try:
If you donΒ΄t have physical a l/r symmetrie regarding your ls and listening postion no basstraps in the world can solve your problem.
This is the most important requirement in a room.
If you have found a place with best possible symmetrie you have to find the best place for your speakers (most less SBIR problems) and for your listening position (with best modal behaviour).
If these conditions have been created, you can think about absorbers.

But theres no way to make a step before the other.

The only consequence I see is to change your loudspeaker position. I would say 90Β° or 180Β° to the left.
πŸ“ Reply

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