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Thread: Pretty Reasonable 411-8A's

  1. #11
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    Pretty Reasonable 411-8A's


    Altec Best's Avatar
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    Re: Pretty Reasonable 411-8A's

    Quote Originally Posted by Phil-G View Post
    i almost bid. but i have a pair i got from AB.
    But your pair are pristine as they have just been reconed by Bill at GPA... Yours are ready for another 15-20 years..

  2. #12
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    Pretty Reasonable 411-8A's


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    Re: Pretty Reasonable 411-8A's

    Quote Originally Posted by Altec Best View Post
    But your pair are pristine as they have just been reconed by Bill at GPA... Yours are ready for another 15-20 years..
    yes they are and yes they will. and i have place for them. but two more would have been twice the power.
    Sonic Barbarian

  3. #13
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    Pretty Reasonable 411-8A's


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    Re: Pretty Reasonable 411-8A's

    Quote Originally Posted by Phil-G View Post
    yes they are and yes they will. and i have place for them. but two more would have been twice the power.
    Agreed ! That's why i'm a big fan of dual woofers..If you have the room go dual woofers...IMHO I think they just sound better...

  4. #14
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    Pretty Reasonable 411-8A's


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    Re: Pretty Reasonable 411-8A's

    i want to try two in each sealed box. a guy named stan told how he placed the woofers rim to rim to aid coupling. like a jbl 4842 does. i wonder if it would make any difference?
    Sonic Barbarian

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    Senior Hostboard Member GM's Avatar
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    Re: Pretty Reasonable 411-8A's

    Depends on how high/steep you XO them. For best coupling they need to be within a 1/4 WL, so with a 16" c-t-c the upper limit is ~13560/4/16 = ~212 Hz, but our hearing is such that up to 1 WL apart is acceptable, so what is normally used for MTMs or up to ~848 Hz, though this high it would normally be at least the -6 dB point and preferably -12 dB.

    GM
    Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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    Senior Hostboard Member valhallax's Avatar
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    Re: Pretty Reasonable 411-8A's

    Quote Originally Posted by GM View Post
    Depends on how high/steep you XO them. For best coupling they need to be within a 1/4 WL, so with a 16" c-t-c the upper limit is ~13560/4/16 = ~212 Hz, but our hearing is such that up to 1 WL apart is acceptable, so what is normally used for MTMs or up to ~848 Hz, though this high it would normally be at least the -6 dB point and preferably -12 dB.

    GM
    I will need to read that another couple times
    "those sounds to which no definite pitch can be assigned are usually classified as noise"<br />harvey fletcher-1928

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    Senior Hostboard Member GM's Avatar
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    Re: Pretty Reasonable 411-8A's

    Yeah, it's a bit much to 'swallow' and really needs a drawing.

    GM
    Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

  8. #18
    Senior Hostboard Member VolvoHeretic's Avatar
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    Re: Pretty Reasonable 411-8A's

    yep, GM reminds me of several collage professors I had that would only offer enough information to pick your interest and make you research your own questions to find your own answers.
    "James, a little knowledge is a dangerous thing!" World's scariest Volvo: [url]http://www.youtube.com/watch?v=AKn-LTNa4rc[/url]

  9. #19
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    Pretty Reasonable 411-8A's


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    Re: Pretty Reasonable 411-8A's

    Yet another thread that shows why I love this forum. Warts and all.
    - Mike

  10. #20
    Junior Hostboard Member TubesNhorns's Avatar
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    Ports

    Decided to go with the flared ports (4" x 6"). Turns out, they wouldn't fit in the space reserved for the ports, go figure
    Removed the 811 horn and made a new motor board that retrofits into the horn's space. I'll put the ports where the horn was.

    I will build a separate cabinet for the 811's that can sit on top of the 'bass bin'. I already have a set of 511 horns mounted this way and now I can swap/interchange the 811's with the 511's much easier.

    My 821-8H's are at GPA being reconed as 416's. Think I will initially bi-amp using a Rane 2-way but am considering the GPA Model 19 crossover.

    I am curious to see what type of gains I will see in efficiency over the original Santiago configuration.
    Attached Images Attached Images

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