Dangers of over treating a room till it is dead

[ChemMan]

Here are my settings and set up photos. I'll try a cross grid with the center being the current listening position equidistant between speaker 95cm and 2.8 m back from the plane of the front baffle. I'll take five measurements around the center, each 50 cm away. View attachment 93318 View attachment 93317 View attachment 93319

 

[ChemMan]

Red is with the chair in place and green is without the chair.  @MartinC I couldn't resist a look.

So it would seem that these are not good at all

 

[ChemMan]

And here are the rest:

What's next?

 

[tuga]

RTA. RIght.  The measurement I took above is from the listening position. I felt it was important for me to understand how it all works before I attempt the speaker placement analysis. By the looks of the graph, my room is a mess.

You should add some smoothing to the curve, maybe 1/12 octave

https://www.roomeqwizard.com/help/help_en-GB/html/graph.html

 

[tuga]

And here are the rest:

What's next?

You should save the measurements and make a note of mic and speaker placement 

It would help if you set the vertical scale to 50dB wide

And add a bit of smoothing, either 1/12 or variable 

 

[tuga]

Yellow looks best but you need to add smoothing 

also 50cm is a lot, you need to fine tune to 5cm

 

[ChemMan]

You should add some smoothing to the curve, maybe 1/12 octave

https://www.roomeqwizard.com/help/help_en-GB/html/graph.html

How's this?

 

[ChemMan]

Yellow looks best but you need to add smoothing 

also 50cm is a lot, you need to fine tune to 5cm

I don't know how to add smoothing.  I have a MAC and your shortcuts are for Windows.  The only ones that worked for me were undo zoom and variable smoothing.

 

[ChemMan]

Yellow looks best but you need to add smoothing 

also 50cm is a lot, you need to fine tune to 5cm

OK.  I found it. It still looks pretty bad

 

[tuga]

I don't know how to add smoothing.  I have a MAC and your shortcuts are for Windows.  The only ones that worked for me were undo zoom and variable smoothing.

Sorry I am away on the phone but it’s in one of the menus in the Apple file bar

cam you reduce the vertical scale to 50dB wide, eg 60 to 110

 

[tuga]

OK.  I found it. It still looks pretty bad

You can select the plots on the left and then choose the all measurements tab

It helps when comparing 

the porthole around 100hz is a bit too wide, maybe some floor bounce interference?

Is this with or without the Moroccan coffee table?

 

[ChemMan]

You can select the plots on the left and then choose the all measurements tab

It helps when comparing 

the porthole around 100hz is a bit too wide, maybe some floor bounce interference?

Is this with or without the Moroccan coffee table?

You are going to have to dumb it down for me. All were taken with the table.

The business at about 45Hz, 60 and 75 is what I suspect is causing all the fuss in the bass boom.

This is what you want to see?

 

[tuga]

You are going to have to dumb it down for me. All were taken with the table.

The business at about 45Hz, 60 and 75 is what I suspect is causing all the fuss in the bass boom.

This is what you want to see?

It looks like 1, 3 and 5 are the worst

can you tick them off and export a graph of that?

then perhaps sketch on a paper the location of the other three?

 

[MotherSky]

Some fascinating stuff on this thread - I just wanted to draw the following to the attention of @newlash09

http://arqen.com/wp-content/docs/diffusers/Diffuser-A1LF-Fab-Drawings-Arqen.pdf - I inadvertently messed up the sound of my room by packing away my CD collection (previously occupying a fair percentage of one side wall and a corner) - I built a three of these "leanfuser" panels in an afternoon at a cost of about £40 in materials - they are (so I have read) scalable within reason if you keep the relative dimensions the same - I have actually made mine a bit taller than they should be for aesthetic reasons, but figure that as they are 2D, this shouldn't matter - in an ideal world I would have made room measurements etc, but I just stuck them where the most acoustically relevant bits of my CD shelving used to be - I have been extremely pleased with the results:

 

(I have dusted since this photo was taken  )

 This has piqued my interest in room acoustics - I have a couple of GIK 'impression' series panels fitted at first reflection points as well - can you recommend a good primer/idiot's guide to REW? I am thinking of acquiring a UMIK-1 and having a go.... MH

 

[ChemMan]

This has piqued my interest in room acoustics - I have a couple of GIK 'impression' series panels fitted at first reflection points as well - can you recommend a good primer/idiot's guide to REW? I am thinking of acquiring a UMIK-1 and having a go.... MH

While I was initially frustrated yesterday with REW, I think you can see by the graphs that by the end of one day I had a handle on it. Their website and Tuga got me going pretty quickly and I feel like it's not a daunting as I previously thought.  You should do fine.  The next task is to do what you did and see if I can make some of the room treatment myself and buy some from Gik.

 

[ChemMan]

It looks like 1, 3 and 5 are the worst

can you tick them off and export a graph of that?

then perhaps sketch on a paper the location of the other three?

Yes, of course.  I'm taking today off as we have visitors, but I'll get after it on the morrow.  Thanks for all the help so far Yoda. :notworthy:

 

[newlash09]

Some fascinating stuff on this thread - I just wanted to draw the following to the attention of @newlash09

http://arqen.com/wp-content/docs/diffusers/Diffuser-A1LF-Fab-Drawings-Arqen.pdf - I inadvertently messed up the sound of my room by packing away my CD collection (previously occupying a fair percentage of one side wall and a corner) - I built a three of these "leanfuser" panels in an afternoon at a cost of about £40 in materials - they are (so I have read) scalable within reason if you keep the relative dimensions the same - I have actually made mine a bit taller than they should be for aesthetic reasons, but figure that as they are 2D, this shouldn't matter - in an ideal world I would have made room measurements etc, but I just stuck them where the most acoustically relevant bits of my CD shelving used to be - I have been extremely pleased with the results:

 

(I have dusted since this photo was taken  )

 This has piqued my interest in room acoustics - I have a couple of GIK 'impression' series panels fitted at first reflection points as well - can you recommend a good primer/idiot's guide to REW? I am thinking of acquiring a UMIK-1 and having a go.... MH

Sure sir...i remember saving a REW handy guide somewhere. Will look for it now and will post back

And thanks for the link to the diffusers, will check it up now

 

[Bokke]

Sure sir...i remember saving a REW handy guide somewhere. Will look for it now and will post back

And thanks for the link to the diffusers, will check it up now

What are you using now?

 

[newlash09]

What are you using now?

Is it about REW or diffusers sir...if it is about diffusers, I haven't gotten them yet. But have my sights on some skyline diffusers at the moment.

 

[Bokke]

Is it about REW or diffusers sir...if it is about diffusers, I haven't gotten them yet. But have my sights on some skyline diffusers at the moment.

I meant for DSP?