Do rough horn welds effect sound quality?
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    Do rough horn welds effect sound quality?

    Do rough horn welds effect sound quality?
    I have a pair of 511b horns. I am not at all impressed with the quality of the welding throughout the horns. I wonder what effect, if any, these rough/messy welds might have on the sound quality. Has anyone smoothed out the welds by grinding, bondo, etc and heard an improvment in sound?

    Steve
    Last edited by samoore; January 11th, 2017 at 01:09 PM.

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    Re: Do rough horn welds effect sound quality?

    Absolutely! Remove all weld splatter from the throat to the bell lip, smooth out the rough throat surface; also remove the brace just outside of the throat. The before and after improvement is sound quality is blatantly obvious.

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    Re: Do rough horn welds effect sound quality?

    What is the easiest way to remove that brace in the throat?

    Steve

    Quote Originally Posted by SD-50 View Post
    Absolutely! Remove all weld splatter from the throat to the bell lip, smooth out the rough throat surface; also remove the brace just outside of the throat. The before and after improvement is sound quality is blatantly obvious.

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    Re: Do rough horn welds effect sound quality?

    Quote Originally Posted by samoore View Post
    What is the easiest way to remove that brace in the throat?

    Steve
    I used a hacksaw blade held flat to the surface and sawed away, you should wear a work glove to protect your hand from the blade and rough surface of the horn. The metal is soft therefore fairly easy to cut.

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    Re: Do rough horn welds effect sound quality?

    I cut all the dividers out of my 811's. I used a sawsall with a long blade.
    Ditto for that center divider.
    Used a sanding block to smooth the areas, then bondo to clean it all up.
    Low gloss black paint from DupliColor and you would never know they weren't stock.
    Finally, I damped them with layers of latex paint and sand to deaden them completely.
    And yes I smoothed out all the casting roughness on the inside.

    To my ears, they sound very good!

    Ron
    Enjoying Altec Speakers since 1972

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    Re: Do rough horn welds effect sound quality?

    Quote Originally Posted by RonSSS View Post

    To my ears, they sound very good!

    Ron
    Can you briefly describe the differences you heard before and after removing the dividers?

    Steve

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    Re: Do rough horn welds effect sound quality?

    Quote Originally Posted by samoore View Post
    Can you briefly describe the differences you heard before and after removing the dividers?

    Steve
    Sure.

    I listen in the near field, and to me it enlarged the sweet spot.
    The dividers were there to improve dispersion in a large theatre.

    I figured why not try it, 811's are cheap. :-)

    Ron
    Enjoying Altec Speakers since 1972

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    Re: Do rough horn welds effect sound quality?

    Quote Originally Posted by RonSSS View Post
    Sure.

    I figured why not try it, 811's are cheap. :-)

    Ron
    I did this for the same reason - they're cheap.
    I didn't notice any sound difference with just the vanes removed but filling the internal weld fillet with Bondo and smoothing the inside surface afterwards made a positive audible difference that I compared to another pair of stock 811s several times in my 19s. The really important part is making sure the throat is completely smooth after filling. Also, lose the Altec cardboard gasket and replace it with wax paper or similar. The gasket creates a ridge that seems noticeable when misaligned.

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    Re: Do rough horn welds effect sound quality?


    Members do not see advertisements
    Do rough horn welds effect sound quality?
    I'm using the 902-8A HF drivers.
    With the bug screens removed.
    So this may also skew the results.

    I'm guilty of making more than one change at a time.....
    Enjoying Altec Speakers since 1972

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