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  1. #1
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    Line Source Speaker Build

    I have a Electrical Engineer friend, Phil, that is a total DIY person. He has rebuilt or modified every piece of equipment he owns. The crossovers and circuits he builds are amazing.

    I have built boxes for other speakers he has constructed, including the sub in the left corner of this picture.



    This is a picture he sent me when he had all of the drivers in and working on the crossovers.

    The 6 midrange drivers are designed by Bruce Thigpen (Eminent Technology). Phil has disassembled them and replaced all of the magnets and changed the circuits.
    The 1 tweeter is by Mundorf and the 2 super tweeters are from a company in the Netherlands. I have forgotten the name.

    I am going to break this into a number of posts as I keep losing the text when making it to long.
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  2. #2
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    Re: Line Source Speaker Build



    This is the finished sub before he installed the drivers. It was MDF with internal bracing.
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    Re: Line Source Speaker Build

    Very cool Brad, like how you apparently wrapped the veneer from each side over top of sub. Yes, I listened in last Sunday, it appears Phil has gone to the Dark Side - dipoles, cardioids, lots of measurements, the whole shebang. Nice.. RIP Bozak.

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    Re: Line Source Speaker Build

    The line source panels were from 1 1/4" MDF. They were covered with Cherry veneer, solid Cherry on the edges and dyed black inlay between them.
    The bases were from 1 /3/4" MDF.

    I started by building all of the jigs I would need to make multiple openings for the different drivers. Aside from the shape they were all different depths and radius on the corners.

    After I finished building the jigs I realized the cutters I planed to use for some of the different steps either didn't exist or weren't going to do the job accurately enough. With trial and painful error I managed to change my approach altering the jigs and how I used them.

    I ended up with different bits in 4 separate routers and only twice picked up the wrong one and started to use it. Only once did a router bit slide out of the collet that holds it in place.
    All three times it made an ugly mess. Fortunately my extensive antique restoration back ground allows me to repair all of the mistakes I make.

    One under repair. This project did cause a bit of increase in wine consumption.


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    Re: Line Source Speaker Build

    Quote Originally Posted by AJ Soundfield View Post
    Very cool Brad, like how you apparently wrapped the veneer from each side over top of sub. Yes, I listened in last Sunday, it appears Phil has gone to the Dark Side - dipoles, cardioids, lots of measurements, the whole shebang. Nice.. RIP Bozak.
    Thanks
    You have clearly helped pull him there AJ.
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  6. #6
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    Re: Line Source Speaker Build


    Main Jig for mid range drivers.



    Insert to route hole through panel.








    Stop block to hold insert in place. Ready to route hole through panel.
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  7. #7
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    Re: Line Source Speaker Build

    I can see a lot of Infinity RS-1b in your friend's speakers, esp the main panels.


    "One of the great challenges of this world: Knowing enough about a subject to think you are right, but not enough about the subject to know you're wrong" - Neil deGrasse Tyson

  8. #8
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    Re: Line Source Speaker Build



    Hole successfully cut through panel.




    Recess for driver flange routed with insert removed.

    Now I only needed to do it 5 more times so the drivers would fit together end to end with no extra space.

    Then do another panel as a mirror image without more mistakes.
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    Re: Line Source Speaker Build



    First group of 6 was a major relief.



    I then added the tweeter openings using the same basic type of jigs.



    I was so relieved when I had the original 1 super tweeter opening done.

    The next morning Phil called and asked if I would do a second super tweeter below the tweeter. In my mind I was saying no, no, no, no I have the hard part done. The other 2 were not problem and took less time than the first 2 did.



    The back of the midrange and super tweeter openings were rounded over as they are dipole drivers.
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  10. #10
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    Re: Line Source Speaker Build

    Philís presentation was very interesting. Itís too bad his Bozakís blew up after all the work he put into them. He spent thousands of hours on those things. Hard to believe there was nothing left but one coil after they blew up.

    I guess Iím one that wonít totally appreciate the DIY component. When Phil mentioned he spent $7000 scouring for old parts on eBay, was exposed to serious chemicals that could affect his health in changing the magnets and an additional 520 hours of build time, I was left scratching my head. Thatís the true love of the DIY guy.

    I can appreciate all the work and joy of doing something yourself. Thatís the fun for guys like Phil, AJ, John and others. I get it. They love building stuff for themselves and thatís awesome. Itís always fun to see what they can do.

    For me, if I wanted Planar Magnetic speakers, I would probably find a gently used pair of Magnepan 20.7ís for $10K and spend the rest of the time listening to music.

    To each their own I guess.
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    Re: Line Source Speaker Build



    Next came the black inlay. A router with a fence on it allowed for the 1/4" wide by 1/28" deep rebate to glue it in.



    I masked off the Cherry veneer to prevent glue being spread onto it.





    My very low tech method for mitering the inlay.



    The inlay is glued in place and held with a few pieces of painters tape until it drys.
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    Re: Line Source Speaker Build





    Panels and bases with inlay and Cherry edging.
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    Re: Line Source Speaker Build


    Next was to make braces to prevent any panel movement





    Phil wanted a round brace he could cover with an acoustical felt. We used 1/2" electrical conduit that I cut to length and fortunately my Emmerts Patternmakers vise flattened it with no problem. It made for very neat ends and I just bent it to the proper angles top and bottom while still in the vise.




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    Re: Line Source Speaker Build

    Super job Brad, simply Superb !
    Cheers ! Ö. Dave

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    Re: Line Source Speaker Build



    Hardware all painted black





    Bases and Panels getting their lacquer finish.
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    Re: Line Source Speaker Build

    Thanks Dave.
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  17. #17
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    Re: Line Source Speaker Build

    The back of each panel has been covered with same acoustic felt.

    I will post finished pictures when I get to hear them next week.
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    Re: Line Source Speaker Build

    brad, thats some incredible work! congratulation, really like it.
    cool working place as well. what sets it above almost other hobbyrooms is that you have a ventilation system!!
    i had a line source speaker not long ago (piega), they do the best imaging of all types of speaker. have fun!
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    Re: Line Source Speaker Build

    Quote Originally Posted by puroagave View Post
    I can see a lot of Infinity RS-1b in your friend's speakers, esp the main panels.
    You are correct. That is what it is modeled after.
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    Re: Line Source Speaker Build

    Quote Originally Posted by Mike View Post
    For me, if I wanted Planar Magnetic speakers, I would probably find a gently used pair of Magnepan 20.7’s for $10K and spend the rest of the time listening to music.

    To each their own I guess.
    Yep. Well, of course Phil is retired. He could clearly have gotten something like the 20.7s with his budget. Haven't heard these yet, but while having some similarities, they should also sound significantly different, the Mags being true lines, Phils being essentially point sources, with a quasi line midbass section, too short to develop true cylindrical wavefronts.
    Plus the voltage sensitivity will be well north of 95db, unlike the 86db/4 ohm Maggies, so effectively around 83db/watt. Not something I would drive with his McIntosh tube amp. If he did it correctly (and it sounds like he did), the cardioid bass bins would also kill the Maggie in that area, punch depth and dynamics. And finally, those Brad creation frames appear to put Maggies to shame in terms of structural rigidity, while also having a gorgeous custom finish.
    Proof will be in the pudding of course, different strokes for different folks.

    cheers,

    AJ

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    Line Source Speaker Build

    Quote Originally Posted by AJ Soundfield View Post
    Yep. Well, of course Phil is retired. He could clearly have gotten something like the 20.7s with his budget. Haven't heard these yet, but while having some similarities, they should also sound significantly different, the Mags being true lines, Phils being essentially point sources, with a quasi line midbass section, too short to develop true cylindrical wavefronts.
    Plus the voltage sensitivity will be well north of 95db, unlike the 86db/4 ohm Maggies, so effectively around 83db/watt. Not something I would drive with his McIntosh tube amp. If he did it correctly (and it sounds like he did), the cardioid bass bins would also kill the Maggie in that area, punch depth and dynamics. And finally, those Brad creation frames appear to put Maggies to shame in terms of structural rigidity, while also having a gorgeous custom finish.
    Proof will be in the pudding of course, different strokes for different folks.

    cheers,

    AJ
    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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    Re: Line Source Speaker Build

    Quote Originally Posted by Mike View Post
    Looking forward to hearing them.
    I'm looking forward to a lot of things, once we finally escape C19!!

  23. #23
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    Re: Line Source Speaker Build

    I asked Phil about how ridged they were. He said he attached a mirror to one of them and shined a laser into the mirror reflecting it to the opposite wall. It was perfectly still.
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    Re: Line Source Speaker Build

    A Party..! I’m late ........

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    Re: Line Source Speaker Build

    A Party..! Iím late ........

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    Re: Line Source Speaker Build

    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
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    Re: Line Source Speaker Build

    Welcome Phil
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    Re: Line Source Speaker Build

    Looking forward to hearing them. Sounds like a labor of love!

    PS, I agree that cardiod bass sounds pretty darn good....
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  29. #29
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    Re: Line Source Speaker Build

    Got to see them assembled today in person.


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    Re: Line Source Speaker Build

    Crossovers for panels in testing.



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Audioshark is a community of like minded individuals. Audioshark welcomes participation from all manufacturers and owners of all brands and products. It is our belief that online forums provide a community of like minded audiophiles and music lovers to encourage the growth of this wonderful hobby.

Sincerely,
The Audioshark.org Team

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