Redoing my control room

[judah]

Aloha Kendale, thanks a lot for your help. I finally completed the corner trap design (with soffit mount for my JBL LSR28P) and here it is. I attached two photos to show what the stand looks like and the fineshed corner traps with bezel and bottom panel. To position the monitor I followed knightfly calculation (room height * 43/46%) and end up with this position. My only concer is the rear port of the monitor. Do I have to put some sort of plug and close it? And more, what is the minimum recomended distance from monitor to corner trap rear wall? Thanks again for your help guys....

J.

[judah]

BTW, I switched back to Solidworks 'cause it calculate the aprox weight of the entire structure. A very nice feature..... My corner trap should weight around 80Kgs without rockwool and monitor, just the bare structure in itself. Top and bottom are 25mm, sides are 18mm (standard measures here in Europe).

[judah]

Sorry to be such a pest but I'm tryin to have my min dcompletely ready before buyin' all the material and starting assembly. I was looking at the "Small Studio" SKP file John posted, and I noticed that in this case the monitors are flush mounted but completely isolated inside a box. The same goes with the SAE design, they enclose the monitor inside a box and the corner trap become a completely different matter. On countrary I noticed that Kendale just put his monitors inside the corner trap and they are firing sounds inside the trap too. Suggestions?
And what about hangers? Do I have to fill up the corner traps with hangers of some sort?

[kendale]

Aloha judah,

My only concer is the rear port of the monitor. Do I have to put some sort of plug and close it?

Aaronw is using the same speakers you are, and has not indicated that plugging the port is necessary. You can check out his thread here: http://johnlsayers.com/phpBB2/viewtopic.php?t=839 and perhaps pm him to get a more in depth answer. Please be sure to post his response for the rest of us, if you do. Thanks!

what is the minimum recomended distance from monitor to corner trap rear wall?

Here's the info I was given way back when:

Monitors should NOT sit on the console but behind, placed on heavy decoupled stands - console placement causes early reflection problems in most cases, unless the console is slanted down in front a LOT.

Distance to wall behind speakers will change response drastically - there is a wall bounce calculator on the Acoustics forum that's fun to play with (needs Excel)

Moving either speakers or your head by as little as an inch or two can sometimes make drastic changes in response, due to modal peaks and dips; here's a useful calculator for figuring this.

Here is the new way to get the Harman Mode Calculator, for which you'll need Excel running on your computer -
First, go to http://www.harman.com/about_harman/tech ... rship.aspx
Then click on "White papers" -
This brings you to a page where you can either read their papers, or click on "Calculators" - you want "Calculators".
Then, click on "Read" - it will bring you to a page where you can download either of the two calculators offered, one of which is the mode calc.

I cut and paste the length and width graphs alongside a scaled room diagram (after scaling them to the same size as the walls) and draw red lines across the room where peaks and nulls are, then green lines where there are NO peaks or nulls - anywhere there's a green intersection is a candidate for speaker or head placement, keeping in mind you need plane symmetry in a mix room (head in center side to side) and an equilateral triangle for speaker/head placement (or at least an Isoscelese triangle)

I was looking at the "Small Studio" SKP file John posted, and I noticed that in this case the monitors are flush mounted but completely isolated inside a box. The same goes with the SAE design, they enclose the monitor inside a box and the corner trap become a completely different matter. On countrary I noticed that Kendale just put his monitors inside the corner trap and they are firing sounds inside the trap too. Suggestions?

One of the main reasons I went with a stand approach was the fact that I had no woodworking skills and was the easiest solution for me at the time, as well as trying to address the air flow/cooling requirements of an active monitor system.

Were I to do it all over again, (and I do hope I get the chance to ) I will attempt the boxed approach as described in the SAE site. That being said, the sound and performance of the current design is far exceeding my hopes and expectations.

I would suggest perhaps searching the forum for solutions others have taken and find one that suits your skills and peace of mind.

And what about hangers? Do I have to fill up the corner traps with hangers of some sort?

I remember reading a post describing the theory behind having bass hangers as coming into use when pro studios started mixing at high levels which generated huge amounts of bass response through the usually large main monitors. While I am finding that I am able to mix at much lower levels now (70-85 db) I did install hangers in the lower front wall section.

There are several posts that recommend filling the corner trap with insulation, that it will give you a smoother response overall, and the main reason for not doing that is the expense.

One thing to keep in mind is, if you are refering to the soffit where your speakers will be mounted, be sure to allow for adequate air flow and cooling.

Hope this helps,

Aloha