We shall see. Looking forward to seeing how he handles driver integration and time alignment, among other challenges. Looking forward to hearing them.
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Line Source Speaker Build
- Thread starter brad225
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We shall see. Looking forward to seeing how he handles driver integration and time alignment, among other challenges. Looking forward to hearing them.
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AJ Soundfield
Well-known member
I'm looking forward to a lot of things, once we finally escape C19!!
a.wayne
Well-known member
A Party..! I’m late ........ 
a.wayne
Well-known member
A Party..! I’m late ........
inline_phil
New member
Brad did an amazing job on the sub and now these matching panels. He is a genius when it comes to woodworking and musical appreciation. A gentle soul with a huge heart. Kudos to you, my friend.
When I picked them up with my wife Althea, he casually mentioned "Next I have to build matching woofer boxes..." and of course my wife's eyes lit up. But that's another story I'm sure Brad will post in the future.
Yes, the panels were modeled after the RS-1B and the woofers are cardioids, with many thanks to AJ in designing the box and a tip of the hat to John for the suggestions to disregard planar alignments and go with flush mounting instead.
The passive networks are 4th-order Bessels each on their own outboard bases, each with their own speaker wiring [hand-wound wires of course]. PC-OCC for the mid and tweet, silver for the super-tweet. I used Canare 4S11 on the woofer [just being a bit lazy here] but one day that too will most likely change.
While in college at the U of Wisconsin, my English teacher [who BTW drove a Jaguar XKE like a mad woman] mentioned something in passing to her class I have never forgotten. "Question Authority" is what she said and that is not saying to become a radical, just that if you want something new, you must draw outside the lines. "If you do what you always did, you will get what you always got" is another way of looking at what she professed. Guidelines from the masters are shoulders on which others stand and from which new ideas spring. It's nice to know that the highly respected names of our times have done their homework and all of them, every one, expect the next generation to improve upon what they have established. In sports, these are called "records" and in science it is called a "breakthrough" and in time they all fall by the wayside because of these new ideas. Even Einstein's so-called "speed limit" has been observed to be defied by astronomers watching particles racing around a sun faster than light [FTL], so what else can we learn from this in the audio realm?
These speakers use a lot of the technological approaches from many different well-known authorities but I put things together in a little different way than usual. "What if..." is a common thought that passes my mind and I'm sure many of you think in a similar way. If we are to advance the state-of-the-art, even as a hobby, saying "what if..." can spawn some very interesting results along with some terrible disasters. Edison took over a hundred attempts at finding the right filament for a long-lasting light bulb but that single success made all of the other heart-breaking failures unimportant.
And yes, I've spent a lot of money on parts [I've got a huge collection of non-inductive resistors, foil inductors, and PIO/Teflon capacitors] and labored into the wee hours of the night or rising long before dawn scratching my head about an impedance mismatches or some such. But the DIYer and engineer in me just keeps gnawing at my conscience knowing that some stunning results can be achieved from even the most modest approaches in spartan workshops.
My latest deviation from the norm is in examining the use of T-pads vs. L-pads. More costly? Without a doubt. Beneficial? As AJ said in one of our discussions, it may be hard to put together a blind A-B test to show any merit. But to me, it adheres to the "What if..." in me that pushes at the SOTA. And yes, my ears do perceive an audible difference [as do measurements confirm] in their use but finding the RIGHT values for the attenuation plus impedance desired is truly a pain. Knowing what sonic improvements this approach makes and the issues it eliminates is half the battle but when you know what to listen for, you can hear it creep into many current designs.
After all is said and done, any DIYer [or engineer for that matter] is usually proud of what they accomplished. And now I get to sit back after all this time and reap the benefits of my efforts. Still, as I sit there in audio bliss, I'm thinking, "What if I move the woofers over here a little and..." so I guess it never ends. BTW, they sound pretty good [I've also been know to be a master of understatement].
Yours for higher fidelity, Phil
When I picked them up with my wife Althea, he casually mentioned "Next I have to build matching woofer boxes..." and of course my wife's eyes lit up. But that's another story I'm sure Brad will post in the future.
Yes, the panels were modeled after the RS-1B and the woofers are cardioids, with many thanks to AJ in designing the box and a tip of the hat to John for the suggestions to disregard planar alignments and go with flush mounting instead.
The passive networks are 4th-order Bessels each on their own outboard bases, each with their own speaker wiring [hand-wound wires of course]. PC-OCC for the mid and tweet, silver for the super-tweet. I used Canare 4S11 on the woofer [just being a bit lazy here] but one day that too will most likely change.
While in college at the U of Wisconsin, my English teacher [who BTW drove a Jaguar XKE like a mad woman] mentioned something in passing to her class I have never forgotten. "Question Authority" is what she said and that is not saying to become a radical, just that if you want something new, you must draw outside the lines. "If you do what you always did, you will get what you always got" is another way of looking at what she professed. Guidelines from the masters are shoulders on which others stand and from which new ideas spring. It's nice to know that the highly respected names of our times have done their homework and all of them, every one, expect the next generation to improve upon what they have established. In sports, these are called "records" and in science it is called a "breakthrough" and in time they all fall by the wayside because of these new ideas. Even Einstein's so-called "speed limit" has been observed to be defied by astronomers watching particles racing around a sun faster than light [FTL], so what else can we learn from this in the audio realm?
These speakers use a lot of the technological approaches from many different well-known authorities but I put things together in a little different way than usual. "What if..." is a common thought that passes my mind and I'm sure many of you think in a similar way. If we are to advance the state-of-the-art, even as a hobby, saying "what if..." can spawn some very interesting results along with some terrible disasters. Edison took over a hundred attempts at finding the right filament for a long-lasting light bulb but that single success made all of the other heart-breaking failures unimportant.
And yes, I've spent a lot of money on parts [I've got a huge collection of non-inductive resistors, foil inductors, and PIO/Teflon capacitors] and labored into the wee hours of the night or rising long before dawn scratching my head about an impedance mismatches or some such. But the DIYer and engineer in me just keeps gnawing at my conscience knowing that some stunning results can be achieved from even the most modest approaches in spartan workshops.
My latest deviation from the norm is in examining the use of T-pads vs. L-pads. More costly? Without a doubt. Beneficial? As AJ said in one of our discussions, it may be hard to put together a blind A-B test to show any merit. But to me, it adheres to the "What if..." in me that pushes at the SOTA. And yes, my ears do perceive an audible difference [as do measurements confirm] in their use but finding the RIGHT values for the attenuation plus impedance desired is truly a pain. Knowing what sonic improvements this approach makes and the issues it eliminates is half the battle but when you know what to listen for, you can hear it creep into many current designs.
After all is said and done, any DIYer [or engineer for that matter] is usually proud of what they accomplished. And now I get to sit back after all this time and reap the benefits of my efforts. Still, as I sit there in audio bliss, I'm thinking, "What if I move the woofers over here a little and..." so I guess it never ends. BTW, they sound pretty good [I've also been know to be a master of understatement].
Yours for higher fidelity, Phil
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