I admit it! I was incorrect! I was thinking more of strap-ons etc. Of course the luxury caps, resistors etc had escaped me. 😡
I put it down to my advanced years. 😉
Looks like we stumbled onto the same thing today, 14 Unhealthy Earth Energies, The Hartmann Net and Curry Grid
I never knew this stuff could f-up fermenting cabbage, who would have known.
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Those unhealthy energies seriously messed up the authors abilities of conversion.
47yards are not 50m when 1yard equal 0.91m.
47yards are not 50m when 1yard equal 0.91m.
I wonder about the connection to the Schumann goofiness? A German name helps with this sort of thing- look at Werner Erhardt, nee Al Rosenberg.
Quite a few friends and family members have a dense curry grid in their home, though extractor hoods have dropped the level significantly.
Curry clamps on the other hand
Attachments
How about this one? A new ultra high tech USB cable to hook up your iPad! A real snip at ~$700! If you can't hear the difference, it means that your system is obviously of insufficient quality! Or (even worse) you are simply not blessed with golden ears!
Apple Series Diamond
Apple Series Diamond
All that crap just does not work on me. I know what happens between the original sound in the air and getting it on to a CD: Plain old copper in the microphone, completely ordinary power plugs and about 50 or so NE5532 op amps.
I wonder what an intelligent race would make of our advertising?
I wonder what an intelligent race would make of our advertising?
A. Why do you "think" most ordinary drivers regardless of size (4", 6", 8", 10", 12", 15", 18", 21" etc.) have a falling SPL output level from between 200Hz and 1kHz and down.. ?
Regarding "A" it is not a direct function of the area of the cone.. But mostly a combination of the limiting effects of the surround, spider and magnet system properties..
Funny enough you will find if you research driver data (and compensate for the cone area effect) that normally the drivers are more limited the physically bigger they are. Actually it is NOT funny at all, but it is how it is and it performs thereafter.
When I designed my 8" (actually closer in size to what a standard 9" driver would be) and removed as much as possible of the limitations I knew that the size of the cone would be THE limiting factor to sustain the SPL level down to 30Hz, 20Hz, 15Hz or for that matter 8Hz. As I use OB (open baffle dipoles) that would normally be the second limiting factor.
However as I do not rely or use any available "cookbook" or tools, but relies on my own research and calculations from the most basic level and up - then I use three of my 8" drivers in OB to achieve a SPL level that are flat down to 30Hz or 20Hz or 15Hz depending on what the maximal SPL goal are.
I have also designed and built a BLH (back loaded horn) with the identical drivers.. With the BLH the drivers get loading (limiting effects) and with a amplifier with enough gain I tested SPL levels above 120dB.
However I use 1 Watt (8 ohm) SIT JFET class A amplifiers with the OB speaker variant and plays at SPL levels peaking up to 100 to 105dB as that is the loudest SPL levels I can sustain over some time.
These 1 Watt amplifiers runs the OB speakers with my own designed 8" drivers, my own designed AMTs, my own passive serial crossover, and the frequency bandwidth are with the -3dB point at 15, 20 or 30Hz depending on the room and how I have customized the drivers.
Try to build a OB with ordinary drivers regardless of size and see if you can achieve a -3dB point at 15, 20 or 30Hz without any EQ.
I would expect you would need EQ of 20 to 30dB or even more...
RayTech,
You have posted a picture from your OB speakers and physics stand in the way of these speakers going down as low as you claim, especially if you claim they do so without EQ.
This is not driver related, but related to the size of your OB, which seems the be relatively small.
About your statement that -quo- Why do you "think" most ordinary drivers regardless of size (4", 6", 8", 10", 12", 15", 18", 21" etc.) have a falling SPL output level from between 200Hz and 1kHz and down.. ? -unquo- it is the opposite of what you argue. To begin with, as a blank statement it is untrue. E.g., there are 4" speakers that happily do 20KHz.
But, you are right in the sense that at some point, a drivers SPL will indeed diminish with higher frequency, but this is mainly due to cone break up and Le; surround, spider and magnet system have little to do with it (with the exception of Le, which can be lowered in any magnet system by using shortening rings).
Cone break up is directly related to cone size, other things such as cone material being equal. So, your "A" is a direct function of cone size.
Perhaps you are having a good laugh at the moment since this is in the snake oil thread, but if you are serious about your claims, I suggest your posts are transferred to a loudspeaker thread.
You have posted a picture from your OB speakers and physics stand in the way of these speakers going down as low as you claim, especially if you claim they do so without EQ.
This is not driver related, but related to the size of your OB, which seems the be relatively small.
About your statement that -quo- Why do you "think" most ordinary drivers regardless of size (4", 6", 8", 10", 12", 15", 18", 21" etc.) have a falling SPL output level from between 200Hz and 1kHz and down.. ? -unquo- it is the opposite of what you argue. To begin with, as a blank statement it is untrue. E.g., there are 4" speakers that happily do 20KHz.
But, you are right in the sense that at some point, a drivers SPL will indeed diminish with higher frequency, but this is mainly due to cone break up and Le; surround, spider and magnet system have little to do with it (with the exception of Le, which can be lowered in any magnet system by using shortening rings).
Cone break up is directly related to cone size, other things such as cone material being equal. So, your "A" is a direct function of cone size.
Perhaps you are having a good laugh at the moment since this is in the snake oil thread, but if you are serious about your claims, I suggest your posts are transferred to a loudspeaker thread.
Hi I wrote: "have a falling SPL output level from between 200Hz and 1kHz and down."
My meaning and understanding was down towards lower frequencies.
I must be very bad in writing / expressing myself when so many reads and get a very different result than what was intended
My meaning and understanding was down towards lower frequencies.
I must be very bad in writing / expressing myself when so many reads and get a very different result than what was intended
Don't worry about it, you are far from alone 😉
I find that the more words used for description just means more scope for misinterpretation .
I find that the more words used for description just means more scope for misinterpretation .
It depends on baffle size. If you put a driver on an infinite baffle, its response curve fits that predicted by Thiele-Small. For a low Q driver, that means a slowly falling response with decreasing frequency, asymptotic to 12dB/octave. This is why open baffle systems designed by competent engineers either equalize or use drivers with higher Q, where the response will be naturally flat until the corner frequency.
Again, this is for infinite baffles- for open baffles of finite size, there is an additional rolloff from front-to-back cancellation, which depends on the baffle geometry and size. One very clever approach was that of Bob Carver, who used deliberately high Q (i.e., very low damping) drivers which would normally peak, but whose peak was compensated for by baffle loss.
While I don't insist on them, I do admit that they can sound darn good! The best ones are quite enjoyable and quite simply "sound great". There is a lot to be said for that.
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