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Reload Thread: Rear fill gone, now a few questions.

  1. #16
    sjv13's Avatar
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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    On axis just means the speaker is pointed at your head or as close as possible. Most tweeters/drivers perform best directly on axis and start to wane in wide-range FR the further off axis they go. Here's an example using the FR curve of the Vifa XT-25 ring radiator tweeter(courtesy of Madisound):



    Axis response is color-coded, so the black line is directly on-axis, purple is 15 degrees off axis, and red is 30 or 45 degrees off axis. Obviously the more off axis you get, the more attenuated the upper range will be even though they all play consistenly until about 2K.
    Ok. Thanks. So since my tweeters bounce off my windshield they'd be considered 90 degrees off axis? Or is it different when bouncing the sound is the idea in the first place?







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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by sjv13 View Post
    Ok. Thanks. So since my tweeters bounce off my windshield they'd be considered 90 degrees off axis? Or is it different when bouncing the sound is the idea in the first place?
    Bouncing off the windshield is a different beast, entirely. To make things easy, it would be more of an on-axis setup, but I wouldn't recommend doing that since reflections are pretty much the source for all that sibilance and harshness we try to remove from our tweeters. If your new speakers come with an angle-mount cup, that'll mitigate a bunch of reflection issues. If you want to go hardcore, invest in a dashmat as well. The difference is pretty remarkable.



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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    Bouncing off the windshield is a different beast, entirely. To make things easy, it would be more of an on-axis setup, but I wouldn't recommend doing that since reflections are pretty much the source for all that sibilance and harshness we try to remove from our tweeters. If your new speakers come with an angle-mount cup, that'll mitigate a bunch of reflection issues. If you want to go hardcore, invest in a dashmat as well. The difference is pretty remarkable.
    Interesting. My tweeters are just in the stock location. What's a dashmat? How much are they? And where do I buy one?




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    Re: Rear fill gone, now a few questions.

    DashMat | America's #1 Dashboard Covers

    Price depends on your vehicle. I got a 40-dollar quote for my Passat, so they're really a low expense. Yeah, it looks weird driving with a dashmat like your grandpappy would, but it should be high up on the list for deadening treatments for any SQ nerd.



    Deck: JVC KD-A95BT
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  5. #20
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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    Bouncing off the windshield is a different beast, entirely. To make things easy, it would be more of an on-axis setup, but I wouldn't recommend doing that since reflections are pretty much the source for all that sibilance and harshness we try to remove from our tweeters. If your new speakers come with an angle-mount cup, that'll mitigate a bunch of reflection issues. If you want to go hardcore, invest in a dashmat as well. The difference is pretty remarkable.

    Mine are in the dash too and I had harshness. But I found that ALOT of attenuation and scooting back about 6" cleared it up. They sound great now

    Edit: Setting the levels properly on the door speakers helped too.
    Last edited by calebkhill; 02-11-2013 at 08:29 PM.




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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by ciaonzo View Post
    excursion and power handling relative to those frequencies. Add to that, power response (on and off axis), filter poles (shallow to steep), phase and time coherency
    @ciaonzo ; Would you mind explaining these concepts? Or post a few links? Would like to read up on some of this. Especially how excursion and power handling are related to frequencies, I'm not sure if I completely understand what your saying here.




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