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Thread: MoD is playing with the Lansing heritage :-)

  1. #1
    Member MoD's Avatar
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    Wink MoD is playing with the Lansing heritage :-)

    Burn hiiiim! Blasphemy!!

    Well I do it out of love...

    As I wrote in this tread

    http://www.audioheritage.org/vbullet...m-a-new-member

    It all started with JBL K(D) 130.

    I got them (K 130) in really rough shape and recone them with D130 recone kit.
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    do not surrender never, except when you have to

  2. #2
    Member MoD's Avatar
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    First try was in some box which was laying in storage. Way to small box, but potential was there.

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    Soon on this site I found plans for appropriate enclosure and built one test sample. It wasn't bad but it was humongous.

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    do not surrender never, except when you have to

  3. #3
    Member MoD's Avatar
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    I decided to build a pair of 4530 horns. Those are intended to be also test enclosures so it was imperative to keep the costs at minimum. I also acquired two 075 hi tweeters to replace Motorola piezo ones.

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    In order to get some waf I painted the speakers.
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    do not surrender never, except when you have to

  4. #4
    Member MoD's Avatar
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    This is where I really get on this, although there is no much bass below 60 Hz, I really liked those speakers.

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    After initial enthusiasm, I was beginning to see potencial for improvements so I bought pair of 2445 compression drivers. Now, that opened a Pandora box, and soon I was buliding test horns. I liked the most truncated tractix 300 Hz horns, so I use test example to made mold for fiber-plastic.

    The rest in tomorrow tense part of this story... :-)
    do not surrender never, except when you have to

  5. #5
    Senior Member macaroonie's Avatar
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    Excellent Zilch would be proud of you

  6. #6
    Senior Member 1audiohack's Avatar
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    That’s quite a journey, lots of fun and good work!

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  7. #7
    Member MoD's Avatar
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    Thank You guys, it is still a journey, and level of fun is out of scale.

    So mold has been done

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    and first horn was finished. Inexperience got me this time, and I had to destroy mold to get horn of him, although i have treated mold with relase compound before plastic was applied. That really got me down, but test of the horn went good, so I use it to make another mold and horn.

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    Making of this horns proved to be the most difficult part of this game, but I really want to build as much as I can by my self.
    do not surrender never, except when you have to

  8. #8
    Member MoD's Avatar
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    After finishing and painting, horns actually don't look to bad

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    So I made the stands for them.
    I wanted to make stands of aluminium, I could't get any, so they ended being build out of steel. Still looking for aluminium though.
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    do not surrender never, except when you have to

  9. #9
    Member MoD's Avatar
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    Considering I have never made any horns, I am very happy how it all turned out, although, there is a lot mistakes, in this build I have learned a lot, now I am confidential that next horns will be much better.
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    I have also changed dampening material in connection chambers of 4530 from wool to 4 mm tick felt. This is much better to my opinion, because it is less damping material so the pressure is greater in the throat of horn. Which is good
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    This is where I started tinkering with crossover networks. After a lot of tinkering I left it with third order 1000 Hz on D 130 and first order on 2445 drivers with 15 dB L pad attenuator which is by passed with 3.7 uF capacitor to boost some hi frequencies because for now I like the system to be two way.
    do not surrender never, except when you have to

  10. #10
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    Nice Work!


  11. #11
    Administrator Mr. Widget's Avatar
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    I’d say you are fearless... Impressive!
    Keep it up!


    Widget

  12. #12
    Member MoD's Avatar
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    Thank You.

    It is easy to be fearless while one don't have to have results, and costs are reasonably low. These are my main speakers now, and listen them almost every day. They are very sensitive, dynamic and inviting for more listening, and I could live with them a long time, but there are also flaws in crossover network and limitations of drivers and horns which will drive me to research and build further. First, something is happening on crossover point. It looks I have a dip, cancellation, phase problem or something. Interesting it is not very noticeable during listening to music, vocal singing, but when speech is played some words or tons of voice are muddy. If that explains a problem...
    That's why I am going to buy a measure microphone.
    Other problems are lack of deep bass, and lack of hi tones (although to my taste very small lack)
    To resolve problem (more like make a problem smaller ) of deep bass I make (in theory) bigger bass horn.
    I have "recalculated" Jensen Imperial built in horn for D130. I started that by placing 4530 connection chamber and throat in Imperial horn and scaling horn path.
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    Friend from Croatian DIY-Audio forum made me Horneresponse simulation of that and bass is looking acceptable.
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    What I do not like are big deeps around 280 Hz and 400 Hz (but that's backloaded horn nature). Since this horn would be really big, I started to look for plan for Hartsfield top loader. Idea is (if I ever get those plans) build one box (rough test box) and measure it, before I start to build my version (also test version for measure purposes) of Jensen Imperial.
    do not surrender never, except when you have to

  13. #13
    Member MoD's Avatar
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    I have acquired Umik1 measure microphone.

    Since I have some suspicions about my 075 tweeters I have first measured them. What do You think?
    Different colour graphs are measurements made at 1 meter distance 0, 15, 30, 45, 60 degrees.
    I think they are loaded with those heavy (made of thicker material) diaphragms.

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    I am thinking about purchasing this diaphragms;

    http://www.soundspeakerrepair.com/sp...phragm/DIA-JBL
    do not surrender never, except when you have to

  14. #14
    Heather [Senorita member] hjames's Avatar
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    Very very cool work!!
    I want the story to continue - tune for your ears!

    Quote Originally Posted by MoD View Post
    Considering I have never made any horns, I am very happy how it all turned out, although, there is a lot mistakes, in this build I have learned a lot, now I am confidential that next horns will be much better.

    I have also changed dampening material in connection chambers of 4530 from wool to 4 mm tick felt. This is much better to my opinion, because it is less damping material so the pressure is greater in the throat of horn. Which is good

    This is where I started tinkering with crossover networks. After a lot of tinkering I left it with third order 1000 Hz on D 130 and first order on 2445 drivers with 15 dB L pad attenuator which is by passed with 3.7 uF capacitor to boost some hi frequencies because for now I like the system to be two way.
    2ch: Oppo, JoLida 502CRC, JBL L212, 18ti,240ti; Heath AS101, Von Schweikert VR4
    7.1: Oppo BDP103D, B&K, UREI 809A, JBL B460

  15. #15
    Senior Member gdmoore28's Avatar
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    Quote Originally Posted by hjames View Post
    Very very cool work!!
    I want the story to continue
    Me, too! It's a lot of fun watching you build your system and constructing all the cabinets and horns by yourself. Excellent work!

    I'm not a JBL user, so I have no idea as to the answer to this question, but - is the D130 really the appropriate woofer for obtaining good bass response below the 60Hz that you report having now? When I was still working in ProSound, the D130 was widely regarded as a guitar speaker with an emphasis on midrange response.

    GeeDeeEmm

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