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Thread: Sierra Ribbon Towers and Safe SPL

  1. #21
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Quote Originally Posted by Pogre View Post
    I'll try. I'm gonna upload it to YouTube. I'm not very prolific there, but I do have an account. You might be able to slow it down in YT settings, not sure. If not it'll give me something new to learn. If you don't hear back from me by tonight send out a search party, lol.
    Ha!
    I’m not prolific in video either...I would have to go to my kids for how to’s, but I know iPhones can do slo-mo.
    -curtis

  2. #22
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Okay! I got a couple of videos made. Poor lighting and my lack of video skills aside I think you'll get a good look at what I mean. Might wanna turn it down a little, the mic on my phone did not make the audio very pretty, lol.



    You can adjust the speed with YT settings, I checked before I posted.

    Okay, only 1 video per post. 1 more coming. The lighting in that one got funky for a second or 2.

  3. #23
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    Default Re: Sierra Ribbon Towers and Safe SPL


  4. #24
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Can you tell the names of the tracks?

    The woofer excursion doesn't seem bad to me. The midrange, in the least, is interesting...I don't think I've ever seen a mid move like that.

    That's small crossed at 80hz?

    I think the dog wants in.
    -curtis

  5. #25
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Quote Originally Posted by John Galt View Post
    Is an ‘alarming’ amount of excursion in the bass and mid drivers at high SPL considered normal if the sound is not distorted? Are they working as designed, and can the large amount of visible excursion simply be ignored?
    And is the visible excursion within design spec of the driver(s)?

  6. #26
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Quote Originally Posted by curtis View Post
    Can you tell the names of the tracks?

    The woofer excursion doesn't seem bad to me. The midrange, in the least, is interesting...I don't think I've ever seen a mid move like that.

    That's small crossed at 80hz?

    I think the dog wants in.
    I see what looks like warping with that mid. The first video captured it well, but it's also the same damn spot where the lighting got goofy.

    Yup. Crossed over at 80 hz, set to small.

    I'm okay punishing myself with a li'l volume sometimes but I usually put the pooches outside when I do. They don't like it very much, lol.


    *Edit: The tracks are "Chocolate Chip Trip" off of TOOL's "Fear Inoculum" and "Dead Bodies Everywhere" from Korn's "Follow the Leader"
    Last edited by Pogre; 06-14-2020 at 01:52 PM.

  7. #27
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Here's an online calculator you can play with

    https://geoffthegreygeek.com/calcula...p-speaker-spl/

  8. #28
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Quote Originally Posted by racrawford65 View Post
    Here's an online calculator you can play with

    https://geoffthegreygeek.com/calcula...p-speaker-spl/
    I haven't tried that one yet. I like to play around with this one. It assumes 8 ohms tho so I deduct 3 dB sensitivity for the 4 ohm Sierra towers.

    http://myhometheater.homestead.com/splcalculator.html
    Last edited by Pogre; 06-14-2020 at 02:00 PM.

  9. #29
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    Default Re: Sierra Ribbon Towers and Safe SPL

    4 ohm's is minimum Impedance for the Towers. If you look at the graphs, the impedance is higher than that as you get above 20 hz. I wouldn't assume 4 ohms whilst doing your power calculations.

    http://www.ascendacoustics.com/pages...T/srtmeas.html

  10. #30
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    Default Re: Sierra Ribbon Towers and Safe SPL

    Using the calculator I linked, and 200 WPC for your Monolith (which is what I believe it is into 8 ohms), at 15 feet you can achieve 99 dB, 10 feet 102 dB, and 5 feet 108 dB.

    I'm about 9' from my Towers, driving them with a Rogue Atlas Magnum II Tube Amp (100 wpc). Listening to vinyl, they are loud at -30 on my MRX720. I'm generally around -37 to -40 for normal listening. I don't recall what I've set the volume limit to in the MRX720 (somewhere between 0 and -10)

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