cousinbillyl

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  • Participant
    cousinbillyl on · in reply to: TD6M, must read #22552

    A quick recap and update.

    The reflection at 700Hz is from the basket posts. It comes from the large flat portion facing the underside of the cone (6 posts). Closed cell foam works best (black in colour (here in Canada we spell color (colour))), open cell foam (white (this we spell the same)) doesn’t work.

    My crossover is a series crossover, so don’t look at my inductor value’s. Parallel crossover’s are different.

    I’ve been using copper foil air core inductors for testing. Now that I’ve narrowed down my value, 2.7mH, I’ve been listening to a lot of music. I remembered I have a couple cored inductors. I decided to listen to a Mundorf Vacuum Impregnated Zero Ohm Cored Inductor.

    Let me first recap what I’ve found over the years. For woofers, the only type of inductor I will use is cored. So no air core inductors. The cored gives me tighter and more impactful base. For tweeters, and mid ranges, air cored is best.

    What about for a mid woofer. My design is a 4-way. So my TD6M is responsible for 150Hz – 1200Hz (even though is cross’ at 1800 (still working on that). Yesterday I installed the cored. There is a fullness in the mid base with the cored. Unfortunately there might also be a slight drop in articulation higher up.

    I will listen for a few days, swap the air cored back in, listen, and report what I think I hear.


    Participant
    cousinbillyl on · in reply to: TD6M, must read #22366

    Hey Parson
    The TD6M is part of a monster undertaking.

    TD15H+, TD6M, Accuton C50 midrange, Accuton BD20 Diamond Tweeter.
    I envisioned, and am developing, are you ready for this?, the Dual Cascade Fully Balanced Paralleled Series crossover.

    The post for the TD6M fix http://www.diyaudio.com/forums/multi-way/279278-4-way-series-crossover-accuton-acoustic-elegance-drivers-3.html#post4455358

    ??? not sure how to post a picture.

    At the above link I posted a few pictures,

    The basket has huge thick support posts. I stuck some closed cell foam to the inside edge. These are temporary, since they will eventually fall off. I will likely take some caulking, and carefully apply small mounds to the inside edge’s.

    I also ran a long thin strip along the edge where the spider meets the housing.

    The 700Hz anomaly was introduced because the basket needed to be really strong.


    Participant
    cousinbillyl on · in reply to: TD6M box volume #11339

    Thank you John.
    Knowing I can go smaller is a plus. It’s much easier to add blocks of wood to reduce volume than the other way around.


    Participant
    cousinbillyl on · in reply to: TD6M box volume #11337

    Here’s the reason for my question;
    I saw the independent measurements of the TD6M. The test was done in a box which appeared to me to be too large. The walls where all perpendicular, and the choice of absorbing material was not ideal.
    I will be building a text box with rounded walls, hopefully with lower complimentary side wall reflections. A deep back with 3-4″ back wall Roxul sound absorbing insulation.
    I will not be adding the volume of the magnet structure to the cavity because it is said absorbing insulation tricks the driver into behaving as if it’s in a larger enclosure.
    Any thoughts?

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