| Forum: Acoustics in Motion |
|---|
| Topic: RFZ shaped control room.. |
|---|
| Re: RFZ shaped control room.. [message #396139 is a reply to message #396104 ] |
Thu, 08 January 2009 05:52 |
 |
 Thomas Jouanjean
Messages: 55
Registered: August 2008
Location: Brussels, Belgium. |
Member |
|
|
When building a shaped control room, ratios that apply to rectangular rooms don't necessarily apply anymore - depending on the kind of shape. For cockpit / non-environmental / FTB rooms, they don't matter much at all anymore. Of course, your room still needs to have proper dimensions, but for other concerns than purely modal behaviour.
If you decide to build such a room, don't forget to leave a lot of space for the treatment on/of side walls and ceiling and think about the fact that LF surfacic behaviours is amplified in shaped rooms. Beware of treatment near and behind your backwall diffusors. You have to manage the LF energy that will go through them and avoid having re-emission and resonances there (which happens everytime and has to be adressed!).
Also it gets real complicated to calculate pressure points in shaped rooms, but take the time to do it right and pay close attention to all that during build.
But IMVHO, unless you know exactly what you're doing, I wouldn't put my fingers into room shaping - leave this to a designer, as it's so very easy to miss it.
Keep us posted!
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
Pro Audio Partners:
Joystick Audio
FOCAL Professional Speakers
|
|
|
| Topic: Do Poly's Need to be sealed? |
|---|
| Re: Do Poly's Need to be sealed? [message #396141 is a reply to message #396064 ] |
Thu, 08 January 2009 06:11 |
|
Thomas Jouanjean
Messages: 55
Registered: August 2008
Location: Brussels, Belgium. |
Member |
|
|
| djwaudio wrote on Wed, 07 January 2009 17:41 |
I'm reading Everest and am considering using a Poly, but the surface I want to join to is not smooth. So sealing the sides with bulkheads isn't an option. By not sealing the sides, does this make it a basic membrane absorber with a curve?
|
If closed, the cylinder will resonate at it's nominal frequency + membrane (wood) frequency, and you will have heavy re-emission at those frequencies. Although, curved wood doesn't behave like a flat wood panel - as there are specific tensions in the material. So wood re-emission freq will be hard to tell, and also vary with how the wood is maintained in an arc form.
If your cylinder is not air tight, it will behave like a tuned Helmholtz resonator, so you can tune it - but practical effective/optimum tuning can only happen on a rather short bandwidth and is linked to the size of the cylinder and size of the "port".
| djwaudio wrote on Wed, 07 January 2009 17:41 |
What are the absorptive differences if so? I'm hoping to deal with some 70Hz null that speaker placement hasn't been able to address in an open floor-plan home.
|
The difference is that one will be fixed and decided by the M³ of your cavity and type of wood used (and you will have 2x re-emission pbs). The other will have less re-emission pbs and can be tuned to a certain extent to meet your 70Hz criteria.
To have it sharp on 70Hz in real life is easier said than done though. So design and tune it with a wide Q.
You can calculate all that with the Helmholtz equation and derivated ones - you'll find it all on the net easy.
What kind of treatment do you have in the room already?
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
Pro Audio Partners:
Joystick Audio
FOCAL Professional Speakers
|
|
|
| Topic: Infrared Heating |
|---|
| Re: Infrared Heating [message #396142 is a reply to message #394793 ] |
Thu, 08 January 2009 06:16 |
|
Thomas Jouanjean
Messages: 55
Registered: August 2008
Location: Brussels, Belgium. |
Member |
|
|
| ziggy wrote on Fri, 02 January 2009 05:26 |
greetings
does anyone have experience with infrared heating systems in a studio? we would like to install one of those in our live-room. it basically heats up the things in the room like furniture, people and the instruments and not the air itself.
would this pose a threat to pianos, mics and guitars?
thank you!
luc
|
It's a good system, I had an interest in that for a while as well.
But I'd be worried about instruments tuning etc. Can't be good that they heat up/cool down/heat up/... - especially during sessions.
So good, but not for studios...
Thomas Jouanjean
Northward Acoustics - Engineering and Designs
http://www.northwardacoustics.com
Pro Audio Partners:
Joystick Audio
FOCAL Professional Speakers
|
|
|
Members
Search
FAQ
Register
Login
Home
