Nousaine wrote:
case you have forgotten and since you obviously need to read it again
http://www.installer.com/tech/aiming.html
Actually your cartoons have no scaling to them.
Well the pictures may not be EXACTLY to scale, but the article does clearly
point out the scale, in the first picture the woofer box rear is 3 ft from the
reflecting wall.... What is it about THAT SCALE you dont understand???
Similar distances in cars for car sub woofer boxes ARE QUITE COMMON!
Scale seems believable to me....!!
The frequencies would have to
be referent to some room dimensions so you can't just 'claim' they are 60 Hz.
Without a distance scale it can't be determined.
Not true!
we dont have to HAVE A ROOM for a standing wave to occur!
A standing wave can occur WHENEVER two (or more) waves combine to make a result
(node or antinode (cencelation or reinforcment)) that is ALWAYS there..!!
In other words, if a reflector causes a peak at 60Hz ALWAYS it is a standing
wave...
Or if a reflector causes a DIP at 60Hz ALWAYS it is a standing wave!
Your schooling on this matter seems to just include the rudimentry facts normally
shown in the most elementry physics books that mention standing waves...
My paper must be confusing you because I show ONLY ONE reflector, breaking
the standing wave problem down to its simplest form, which doesnt make sense
to you cause THERE IS NO ROOM!
ha ha
2nd.... A self proclaimed AUDIO GURU such as yourself should know that
a 20 or 30 ft wave as you suggest above would be about 37Hz to 55Hz if
your here on planet earth with the rest of us, but you keep rfering to 60Hz
which is only about 18ft.....
60 Hz is where the the lowest axial mode occurs in many small cars.
Like your little CORVETTE.... Yes, there are MANY corvettes out there!
You carefully worded that so that YOUR statement may be correct!
But its sad that YOUR WORDS have little to do with mst of the folks out there!
Why hide behind these carefully choosen words?????
Why not speak the truth with as many words as you can??
3rd... And this is where I would guess your off track in your theories...For
a standing wave to occur the whole wave (18ft at 60Hz) doesnt need to be
stretched out to a full 18 ft like you seem to be saying... A reflection can
come back on itself and create a standing wave in as little as 1/4 wavelength
(4.7ft)....
OK, what's the frequency of the that standing wave? (Hint:, the 2nd of 60 hz is
120 Hz, the 4th is 240 Hz.)
MORE IMPORTANTLY where are the nodes and antinodes!!!
I think you missed that part in physics class! Were yu sick that day???
So while your spouting the HUGE 20-30ft wavelengths (as you
did above) trying to justify your position, your ignoring (or just dont know)
about the facts that standing waves occur in as little as 1/4 wavelength (and
even shorter is possible in complex reflective situations like A CAR).....
As I said, the standing wave region in a small car is between roughly 60 and
600 Hz.
So your just saying 60Hz and 600Hz??
Am I hearing you correctly??
I think your mistaking RESONANCES with STANDING WAVES!!!
Tom, I hate to dissapoint you but I was an AES member back in 1982...
So what happened?
I guess you were dissapointed by the facts that you mention AES in the
attempt to make your self look like a bigshot and I already been there and
done that..... ha ha ha
Yes I have the LMS system, and I have been around audio test equipment
for well over 30years.....
OK then why not publish some response graphs at the listeners head position
with the enclosure in different directions or locations? That's what I did.
Cause Im lazy, its raining today and I would rather watch these kiddos call
you names here on the internet..... ha ha ha
Eddie Runner
http://www.installer.com/tech/.