Thanks for the great link to the paper. Very interesting reading.
My interest at the moment is low level experiences - not to make any enemies with my neighbors!
All -
By the way, the LF component -- a low-compromise bass horn I am designing has been evolving (on paper) for nearly 20 years. Due to physical constraints and logistics, costs, until recently, I have been unable to realize a bass horn of the dimensions I need. The design I'm now looking at is a straight exponential horn with mouth dimension approx 44' in circumference and I expect it will be approximately 17' in length. Of course this is an outdoor project. It will be installed in an amphitheater at a colleagues property.
I hope to realize nearly 50% efficiency from the bass horn. We have a variety of other cabinets (mostly folded horn) to take care of bass, upper bass, etc.
Regardless of if my idea to implement some of the electronics in Linux is possible, we will be moving forward with traditional analog equipment for the bass project. Again, my hope was to enjoy an element of control over the sub/infra-sonics which otherwise would be difficult with analog gear.
Thanks for your time. I promise this is about Alsa/Linux.
Ronan
On 2/2/07, Dominique Michel <
dominique.michel@xxxxxxxxxxxx> wrote:
Le Thu, 1 Feb 2007 16:15:20 -0800,
"ronan mcallister" < bass.woofer@xxxxxxxxx> a écrit :
> Bill, Sergei,
>
> Generally, I am investigating the limits/extent of what I can do with
> Linux/Alsa/DSP as an alternative to commercial equipment in these three
> areas:
>
> 1. the live concert scenario (we currently do everything analog now) -- as
> previously discussed.
> 2. home theater / hi-fi
> 3. something I haven't mentioned before: using WinAudioMLS and RME 9632 as a
> RTA (I know this will work) -- eg measurement/RTA for both home hi-fi and
> prosound / live concerts.
>
> All of these to extend below 20Hz as far as I practically can.
>
Which instrument can play a note below 20 Hz? Even the biggest church organs
cannot do that.
> Sergei, I will be digitizing my SACD audio output via a RME card etc as I
> think you must be right about interfacing a SACD to Linux
> directly/digitally... And I want an analog input/output capability if at
> all possible as after all the real world is analog!
>
You must look at the alsa soundcard matrix:
http://www.alsa-project.org/alsa-doc/
After, you must be aware of one thing: at alsa support analog input/output
capability don't mean at the hardware is capable to output frequencies below 15
Hz.
> I'd like to think if I had LF response down to 5Hz, besides the
> vibration through direct bone conduction, I might realize improved transient
> and phase response in the audible range, resulting from the extended LF
> response of my audio system. What do you think?
>
Technically speaking, this is the only point where a so low bass response will
do something good. But it is no speaker on the market that can do that.
For what I know, the first subsonic experiences was made by the nazis
during WWII. They was torturing prisoners with subsonic frequencies. So be
careful with it. In fact, even frequencies between 25 and 50 Hz can have a
physiological impact on the body, It is a very complicated matter because we
all know at we don't feel the same after listening to a concert of hard rock or
salsa music.
This paper can be interesting to you: Acoustic Weapons—A Prospective
Assessment: Sources, Propagation, and Effects of Strong Sound
http://www.einaudi.cornell.edu/PeaceProgram/publications/occasional_papers/occasional-paper22.pdf
Ciao,
Dominique
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user
------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
