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Mike

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Posts posted by Mike

  1. Ricci's Skram Subwoofer & Files

    in Bass Projects

    Posted

    Thanks for the link to Limiter guideline. My active version of the Skram's is done. I just need to load the Eminence's and setup the limiters.

    On 9/27/2022 at 1:13 AM, kipman725 said:

    this document from powersoft has some guidelines (6" coil): https://www.powersoft.com/wp-content/uploads/2019/01/powersoft_TN009_LimiterSetup_en_v1.0.pdf

    Limiters are also a function of the box design and to an extent the program material.  They are used to prevent over excursion and thermal damage.  You can check this in Hornresp but I don't think the amplifiers above have enough output voltage with this driver to cause over excursion with an appropriate high pass filter.  Then you are just left with thermal damage for which you want the TruePower limiter.  To set this you start at a low value and measure magnet temperature* over a long period of time while running program material that is heavily compressed by the limiter.  Adjust up the limiter slowly (it may take on the order of an hour for the magnet temp to stabilize) until you reach the maximum magnet temp you want to allow (<100C !).  This procedure takes a long time, makes a lot of noise and may destroy your driver...   

     

     

     

     

     

     

     

     

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    • Like 6

  2. Ricci's Skram Subwoofer & Files

    in Bass Projects

    Posted

    Hi All, Finally I have all the parts for my for my active versions built. I'm using NSW6021-6 21"  with Loto Dsp amp module from powersoft with either the 3004PFC2 or 4HV amplifier amp modules, I might try both amps options...The DSP has a few limit options available. What's the best value for the NSW6021-6 driver for the following limiters.  
    1, TruePower TM
    2, RMS Voltage
    3, RMS current
    4, Peak Limiter
     
    Thanks

  3. Ricci's Skram Subwoofer & Files

    in Bass Projects

    Posted

    On 1/27/2022 at 10:16 PM, kipman725 said:

    The maximum peak SPL spec is essentially meaningless but I can tell you from comparing the SKRAM to FANE 18XB reflex subwoofers in simulation 4 SKRAM with B&C 15DS115-4 will surpass the output 10 40Hz tuned 18XB loaded reflex boxes.  So to surpass the output of your 4 single 18" subs I would expect you to need two SKRAM.

    Thanks for the reply....Sorry I should have been more specific. The subs I'm currently using are 4 Axiom Proel 18" subs.Loaded with 18Sound Neo drivers and 2000w Powersoft  plate amps..Not a DIY. I'm looking to down size in terms of number of subs. Will 2 skram outperform the 4 single 18's. I do mainly live band stuff. Output Below 30Hz not required.  Thanks

     

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