John Sayers' Design Forum

John Sayers' Recording Studio Design Forum

A World of Experience
Click Here for Information on John's Services
It is currently Thu Jul 29, 2021 3:07 am

All times are UTC + 10 hours

Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Sun Jul 21, 2019 11:15 pm 

Joined: Tue Nov 18, 2014 11:37 am
Posts: 7
Location: Wales, UK
Whilst idly thinking of room layouts for a particular problem, I started looking at splaying walls. The main reason for splaying walls in this situation is not to solve acoustic issues, but for architectural and access reasons.

Splaying wall the side walls of a room outwards from the speaker wall has the effect of moving the first reflection point further along the side wall towards the speaker wall end of the room. If the room has wall mounted speaker construction with the speaker walls angled, it is posible to move the theoreticall first reflection point behind the speaker wall – ie no first reflection point at the listener position on the side wall.

As one changes the wall splay angle, (keeping other variables the same), there comes a point where the first reflection point is actually in the corner of the side wall/speaker wall boundary. What are the consequences of this? Some thoughts:

1. Would it lead to a very strong image at the listener position if the time delay between the direct sound and the reflected sound was less than the Haas masking time?
2. How much would the comb filtering would affect the frequency response at the listener position?
3. A reflection point in a corner might detrimentally affect the modal response of the room
4. The reflection point in a corner makes it hard to apply treatments. Would putting absorbers in this corner start affect the functionality of the speaker wall (which is supposed to be a reflecting surface)?
5. In practical terms, as one increases the angle of the wall splay, at what point do these effects start to reduce? i.e. How far behind the speaker wall/side wall boundary does the first reflection point have to be before these effects are reduced to negligible?

As it is a bit of an abstracte question, here is sequence of pics based on a particular case to illustrate the effect follows. Any thoughts or comments?

You do not have the required permissions to view the files attached to this post.

Report this post
PostPosted: Tue Aug 27, 2019 12:04 am 
Senior Member

Joined: Tue Mar 25, 2008 3:31 am
Posts: 544
Location: Cork Ireland
Radiation from a speaker generally becomes more and more directional as frequency increases.
Imaging etc. only occurs at higher frequencies.

Report this post
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC + 10 hours

Who is online

Users browsing this forum: No registered users and 17 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group