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  1. #1
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    Default Sony buyout project

    coming back to them
    thread started here http://techtalk.parts-express.com/sh...ht=sony+buyout
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  2. #2
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    Mar 2011
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    Chicago - the guts
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    Default Re: Sony buyout project

    And continuing here right??

    Looking forward to your continued progress. I have a case left and it's too cold to work in the garage now, so I'm contemplating a propane heater or something, but how do I hide it from the wife??

  3. #3
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    Default Re: Sony buyout project

    because of highish Qts, I've decided that this driver is best to be used in a dipole configuration. As most of the guys know, my preference in general are line array systems. And so, here's a perfect contender for a ultra cheap build.
    The problem with a build like this is finding a good enough tweeter without breaking a bank. Seas TDFC, Dayton RS28A would probably be slightly better choices. I don't have these on the shelve and didn't want to buy another pair just for this project. But I did have a pair of Vifa buyout tweeter. Basically it's a DX25 that is used by ProAc in their 5k loudspeaker models. Not a perfect tweeter but at $26 it's really good AND I got it at like $19. ProAc version is very close to the DX25.

  4. #4
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    Default Re: Sony buyout project

    Quote Originally Posted by bkeane1259 View Post
    And continuing here right??

    Looking forward to your continued progress. I have a case left and it's too cold to work in the garage now, so I'm contemplating a propane heater or something, but how do I hide it from the wife??
    yes yes, let me type and post measurements and ideas.

  5. #5
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    Default Re: Sony buyout project

    drivers are wired 3series/4paralel.
    impedance is pretty friendly, considering we'll be adding the tweeter. Idactive raise shows a very basic motor design.
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  6. #6
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    Default Re: Sony buyout project

    MLS FR with 4msc gating. Mic is about a meter and a half away, centered on the array. High frequency loss, due to the driver coupling is pretty evident here. As with anything else, no free lunch. This is why I was looking in to robust tweeter, capable of keeping up with an array in to 2000hz area.
    Again, it's not unusual for a line array.
    Now, the added "oopsy" is the fact that it's a dipole and it rolls of much earlier then a conventional speaker in the box.
    Oh and cone resonance, even with high frequency loss is ear shuttering.
    So, we got our work cut out.
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  7. #7
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    Default Re: Sony buyout project

    I've attached the tweeter, did some MLS and modeling. Just a few first tries. You may say: "Aha! Roman, you are crazy! Nothing good will come out of it." But wait. Looks like a 3.2mh inductor should flatten the woofer response and still have enough output in to 2k area to blend with the tweeter flat enough. Alas, I only have 2.7mh. But, I figure I try and it's not the end of the world.
    Tweeter has a 2mfd on it, polarity is not reversed. So, this on axis FR is very ragged and surely not something I can live with. Tweeter rolls off too early, the knee is incorrect. Woofer needs to be corrected as well. But surprisingly, the speaker didn't sound as horrible as it looks.
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  8. #8
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    Default Re: Sony buyout project

    Then I decided to make the tweeter work harder and lower. 5mfd capacitor.
    Mind you, this is not precise modeling or even controlled measurements. I am only throwing parts together to see which way to go and how far I can get waving the sword and riding a wight horse.
    The individual roll offs of the drivers give more incite of the sound.
    Vifa needs to work even lower and drop down at a higher slop. Second order filter looks like a good idea at this point.
    Sony may or may not work with the second order but a cone resonance appear to be audible. Something is bothersome about the sound. It's nasal and chesty at the same time.
    Second graph shows individual roll offs, FR of both an array and the tweeter and overplayed analog sweep.
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  9. #9
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    Default Re: Sony buyout project

    At this point the response does not look so terrible and the speaker is actually starting to sound reasonably well. Of cause it needs more work. I wanted to look in to harmonic content of an array. The sweep is analog and contaminated but interestingly enough, cone break up is there and shining. This is one of the reasons, this array does not sound very pleasing. I'll have to design a notch for that resonance. I may also try to apply coating to the dust cap.
    So from here, the plan is to get a couple of coils for the woofer array.
    Notch out cone resonance and design a second order filter for the tweeter so it can work in to 2k and then drop down in to nothingness.
    I'll be also trying a sidewall to increase apparent front baffle width and see how that affect the knee of the woofers output. May be smaller inductor will work better in this configuration. I really don't want to stress the tweeter that much.
    The efficiency of the system should be in to 91db with power handling limits only gated by the tweeter capabilities.
    There are some line array qualities that are starting to come through. Life like effortless sound. Large vertical image. I only have one assembled so far. More work ahead.


    is all for today
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  10. #10
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    Chandler, AZ
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    Default Re: Sony buyout project

    It's good to see that you're back to work on the Sony buyouts. I'm sitting on my case waiting for a line array design. Thanks for taking this one on. I'll be tuned in, as they used to say...

  11. #11
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    Apr 2011
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    Londonderry, NH
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    Default Re: Sony buyout project

    yeah, with 44 more of these drivers on my shelf, I am definately excited to see this thread pop up today. The thought of dipole-open back makes this a much simpler process....Hats off to that.

  12. #12
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    Default Re: Sony buyout project

    I have four cases. Im just waiting for an appropriately priced tweeter/micromid. I'm shooting for a 4-way.

    Also - anothre member seemed to tame the resonances with dampening the frames with rope caulk, others with peal n seal. You may try this and re-measure. Electrical notch may not be needed.

  13. #13
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    Default Re: Sony buyout project

    Quote Originally Posted by Sidi View Post
    Also - anothre member seemed to tame the resonances with dampening the frames with rope caulk, others with peal n seal. You may try this and re-measure. Electrical notch may not be needed.
    There's nothing wrong with reinforcing the frame and using some additional dampening. The major issue does not come from the frame but from the cone and that needs to be notched out. Anyone with some experience measuring drivers will recognize a narrow ridge propagating a few milliseconds

    The update is this.
    I've designed a notch filter. It's a parallel bottomless notch consisting from .35mh coil and 2mfd capacitor. The difference in the sound is significant to say the list. Anyone who already build systems based on these Sonys, should try notching out 6k resonance.
    I've attached a picture of the different notch filters effects on frequency response. This is not the final version. Because notch can affect the tail of the woofers roll off, finalized version will be designed after on axis response is leveled out. I am now running a second order on both, tweeter and the woofer array.
    Array is starting to sound really nice. Needs more base and I'll be playing with a U-pole idea aka adding the wings. Friend of mine came by and listened and then I told him what the drivers are his jaw dropped.

    THE SOUP IS IN THE TAILS!!!
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  14. #14
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    SW MI
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    Default Re: Sony buyout project

    Very cool that you're running with this again. You inspired me to get off my **** and get mine going! Still waiting on some measurement gear and my cnc buddy, but hopefully I won't be too far behind you!

    I look forward to more good results .

  15. #15
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    Default Re: Sony buyout project

    Thanks.
    I am guessing, another month or so till final version. It's a cool project. $70 in parts? Hello NY DIY 2012 under $200 category.

    mmmm the name the name

    how about
    Antey-24/2

  16. #16
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    Oct 2005
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    Sioux Falls
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    Default Re: Sony buyout project

    Best project going right now.

  17. #17
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    Jul 2011
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    Omaha
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    178

    Default Re: Sony buyout project

    Can't wait to see the results!

  18. #18
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    May 2008
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    Winfield, WV
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    241

    Default Re: Sony buyout project

    Quote Originally Posted by r-carpenter View Post
    mmmm the name the name

    how about
    Antey-24/2
    Cool project! For the name how about just 24? Yes it's a direct ripoff of the show but it has a dramatic effect just like the appearance of the speakers do. Just a thought.

  19. #19

    Default Re: Sony buyout project

    About time! I've needed something to do to make use of my Sony buyouts.

    Now, I wonder if I can replicate this design. Is that tweeter still available? If not, is the DX25 close enough to use with the same crossover?

  20. #20
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    Default Re: Sony buyout project

    thank you thank you. )))
    Stock DX25 may be slightly more sensitive compare to ProAc version. Other then that, I think you could. FR looks almost identical. I can alter the crossover for stock dx25 as well. Want to send me one? I may just buy a pair later and use them somewhere along the lines but it'll probably be in 2012.

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