I have acoustic foam... now what?

[Jens Eklund]

4m x 5m x 2.5m room - modal resonance problem

[JoonJukx]

Dead link

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[Jens Eklund]

Originally Posted by JoonJukx

Dead link

Works fine here.

[Arthur Stone]

What Jens says + mirror points: The Studio SOS Guide To Monitoring & Acoustic Treatment

I also made a ceiling cloud by making a simple wood frame to hold 2 tiles and covered it with cloth.

[Jens Eklund]

Originally Posted by Arthur Stone

What Jens says + mirror points

Better to measure (by using the ETC) and locate (and then treat) the actual reflection paths causing high gain early reflections, than trying to guess by using mirrors:

Monitor & Mixing Desk Placement - Reflection Issues

[JoonJukx]

Originally Posted by Arthur Stone

What Jens says + mirror points: The Studio SOS Guide To Monitoring & Acoustic Treatment

I also made a ceiling cloud by making a simple wood frame to hold 2 tiles and covered it with cloth.

Can I possibly see a pic of your ceiling? And I tried the mirror idea... can't seem to grasp the technique... my room is so small that every were seems to have the speakers in sight

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[Arthur Stone]

Originally Posted by Jens Eklund

Better to measure (by using the ETC) and locate (and then treat) the actual reflection paths causing high gain early reflections, than trying to guess by using mirrors:

Monitor & Mixing Desk Placement - Reflection Issues

Thanks for the advice Jens
I have treatments at mirror points (as far as my room architecture allows) and then a KRK Ergo. Basically I've had to compromise as I have a home studio (although that is no defence on Gearslutz ).

Personally I found that placing the tiles in exactly the same position as a mirror reflection of the monitor, made a huge difference to soundstage/resolution/tone/dynamics but it's good to know I can improve on this.

I will be exploring the ETC of my room but I doubt that I'll be able to re-position the treatment; if I get a better understanding now it will help when I design and build my next studio.

@JoonJukx
No pics at mo - will do one later if I have time...it's a basic rectangular wood frame with a centre spar that creates 2 square holes for 2 tiles to sit in...I padded it and covered in material and then hung it from 2 hooks in the ceiling.

[Glenn Kuras]

Personally I found that placing the tiles in exactly the same position as a mirror reflection of the monitor, made a huge difference to soundstage/resolution/tone/dynamics but it's good to know I can improve on this.

Which it will.
Video Early or First Reflection Points - GIK Acoustics

Joon,
See the following to help with set up.
The Basics of Room Acoustics: Bass Traps, Diffusion, Panels - GIK Acoustics
also understanding low end
Bass Traps and Understanding Low Frequencies - GIK Acoustics

[Jens Eklund]

Originally Posted by Arthur Stone

Thanks for the advice Jens
I have treatments at mirror points (as far as my room architecture allows) and then a KRK Ergo. Basically I've had to compromise as I have a home studio (although that is no defence on Gearslutz ).

Personally I found that placing the tiles in exactly the same position as a mirror reflection of the monitor, made a huge difference to soundstage/resolution/tone/dynamics but it's good to know I can improve on this.

I will be exploring the ETC of my room but I doubt that I'll be able to re-position the treatment; if I get a better understanding now it will help when I design and build my next studio.

@JoonJukx
No pics at mo - will do one later if I have time...it's a basic rectangular wood frame with a centre spar that creates 2 square holes for 2 tiles to sit in...I padded it and covered in material and then hung it from 2 hooks in the ceiling.

The "mirror trick" works if you’re only interested in theoretical first order geometric reflection points assuming an omni source. Then these reflections are normally the strongest ones, but speaker directivity might be very different from a point source so just because you see the speaker in the mirror does not mean that you´ll get a strong reflection from that surface.

What a mirror fails to discover is higher order reflections (a reflection that uses two or more surfaces to bonus back to the sweet spot) and reflections caused by diffraction (speaker baffle desk, screens etc) and above all; At what level is the reflection?

I haven’t read the article linked to, but I would advise against reading any article that is supposed to cover the topic of early reflections, that does not mention the ETC at all, but only talks about mirrors ...

[Glenn Kuras]

Originally Posted by Jens Eklund

The "mirror trick" works if you’re only interested in theoretical first order geometric reflection points assuming an omni source. Then these reflections are normally the strongest ones, but speaker directivity might be very different from a point source so just because you see the speaker in the mirror does not mean that you´ll get a strong reflection from that surface.

What a mirror fails to discover is higher order reflections (a reflection that uses two or more surfaces to bonus back to the sweet spot) and reflections caused by diffraction (speaker baffle desk, screens etc) and above all; At what level is the reflection?

I haven’t read the article linked to, but I would advise against reading any article that is supposed to cover the topic of early reflections, that does not mention the ETC at all, but only talks about mirrors ...

All good points and in the video (above video) we put out we do talk about ETC but that is about it. We do plan on doing a article just on ETC in the future for the "more advanced" user.
Needless to say though for the person that is having trouble figuring out how to test (or figure out ETC graphs) the room with software and or a beginner, the mirror trick is a great starting point.

[JoonJukx]

Any suggestions for windows?

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[Arthur Stone]

Originally Posted by JoonJukx

Any suggestions for windows?

Use them as bass traps - use curtains to add or remove colour from room.