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How to Train Your PM180-8

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  • Pete Basel
    replied
    It would be great if someone could make a 3D printed template with slots to guide the cutting
    of this cone. Then anyone, hopefully, could make the slit cone version with at least some
    confidence.

    Leave a comment:


  • JRT
    commented on 's reply
    Pete... Haven't seen you participating in the conversations here in more than a year, which seems unusual given your nearly 20k posts between October 2005 and March 2020, and am hoping that you are OK and are maybe just taking a break from it.

  • jbruner
    commented on 's reply
    Glad you enjoyed it. I aim to please.

  • scottvalentin
    replied
    This was a fun read - hadn't seen it before. jbruner thanks for updating this.

    Leave a comment:


  • jbruner
    commented on 's reply
    I would love to see your results!

  • Pete Schumacher
    replied
    Originally posted by jbruner View Post

    Yeah, I'm certain it's a really nice speaker now! Good to see the old people still around! Enjoyed meeting you a few years ago!
    They have been Ryan's main speakers since the day we finished them. Still occupy his main listening room today. Your mod is utterly transformative and should be incorporated at the factory.

    Leave a comment:


  • jbruner
    replied
    Originally posted by Wolf View Post
    I heard the ply-stacked Derecho version on the banner at AXPONA that year, and I really liked them! Smooth, easy, and dynamic; they are a special build.

    Good to see you are still around, Josh!
    Wolf
    Yeah, I'm certain it's a really nice speaker now! Good to see the old people still around! Enjoyed meeting you a few years ago!

    Leave a comment:


  • fatmarley
    replied
    I used the slicing technique on some Eminence alpha 6C drivers that I bought for the car. It worked well and allowed me to run the drivers without a low pass filter. Should have the measurements somewhere...

    Leave a comment:


  • Wolf
    replied
    I heard the ply-stacked Derecho version on the banner at AXPONA that year, and I really liked them! Smooth, easy, and dynamic; they are a special build.

    Good to see you are still around, Josh!
    Wolf

    Leave a comment:


  • jbruner
    replied
    I had hoped that Pete or Ryan would update this thread, but I guess it's up to me to tell what happened. Upon request, I sent the original drivers from this thread to Ryan at Vapor Audio. That was early July, 2015. No response. In January 2016, I attempted to contact him. I got thru to him in February and told him I wanted to pass the sliced pair on to someone else, He said they were in the Derecho, and he wanted to keep them. He said he was planning on a full write-up, which tragically never happened. He did send me replacement drivers.

    In the next few years, I saw sporadic glimpses on the internet of the sliced drivers at some industry shows. Apparently they were very well received. Just this year, I reached Ryan by phone and got permission to post this update.

    The sliced PM180s are still in service in Ryan's Derecho speakers. He likes the improvements and said there is no downside. Without putting words in his mouth, here's a quote from Ryan on the internet. "The Derecho have the same midrange, but with the sliced cone process applied that totally transforms and greatly refines the presentation. It was a DIY'er, Josh Bruner, who created and perfected the process. When we got our hands on a pair, we decided to make them the standard midrange. It's a small improvement on paper that results in a large improvement in the real world." I also noticed that Pete S. praised the modified drivers in another thread, but never came back here to reveal his changed opinion.

    So, I'm back here to say that the process works, and is long-term durable. I have some sliced drivers that have been in service for 6 years. I've already presented the science, so I'll just give my opinion now. The results are MAGICAL. No other driver modification is this effective or this important. This process will transform many drivers into the proper midranges that you always wished they were.

    Here's a pic of the Derecho I cribbed from the web. Click image for larger version

Name:	zzzzzzzAxpona Derecho mod.jpg
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  • Wushuliu
    replied
    Jbruner, have you seen Troels' latest piece on using surround treatment with glue? Could be a clue to a less destructive method to get similar results...

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  • ani_101
    replied
    These sounds fantastic in the vapor audio speakers...

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  • Wushuliu
    replied
    Just found this. Oldie but goodie, especially the Scan Speek thread referenced in first post...

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  • dcibel
    replied
    Re: How to Train Your PM180-8

    I'll give it a shot, thanks for the tip.

    Leave a comment:


  • fdieck
    replied
    Re: How to Train Your PM180-8

    I use blue painters masking tape to clean my sticky surrounds on vintage drivers since it seem to be tacky enough to pull the fluffies loose without ripping the surround. Avoid solvents although I have used denatured alcohol on 50 year old drivers with extreme stuff stuck to them.
    Last edited by fdieck; 06-18-2015, 01:25 AM.

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