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Thread: Please help me decide what to do with my 846As

  1. #16
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by bart1 View Post
    After playing them a while and adjusting the HF level a bit, they got better. I'll have to listen to them some more to see if I want to try to take them further.
    Some people call that "break in period".

    I call it getting used to them.


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  2. #17
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    Always check the basics, right? The PO had marked the speaker terminals with a +/-, so I went that way. Yep, stuck a battery to them and one was marked backwards! Now, while still no subwoofer, the bass is more in line with what I expected! I'll start over and do some more listening and see where we go from there. Feeling much better now though. What's the easiest way to confirm horn phase? I don't really have any measurement tools.

  3. #18
    Administrator Mr. Widget's Avatar
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    Excellent! I'm glad to hear you sorted that out… I'm not aware of any ways of checking on the phase of HF drivers without test gear, maybe someone here has a practical trick to share.

    Keep us posted on your progress.


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  4. #19
    Senior Member grumpy's Avatar
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    if you can play a tone (source, CD, PC tone generator, whatever) in the crossover region,
    the wrong phase often will result in a somewhat quieter tone.

    or... FM radio static (noise) and a smartphone FFT or oscilloscope or SPL app

    This is what... ~800Hz and 12dB/oct crossover? if so, might cancel pretty well
    when connected incorrectly (woofer and horn audio out of phase when they "meet").

  5. #20
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    Quote Originally Posted by grumpy View Post
    if you can play a tone (source, CD, PC tone generator, whatever) in the crossover region,
    the wrong phase often will result in a somewhat quieter tone.

    or... FM radio static (noise) and a smartphone FFT or oscilloscope or SPL app

    This is what... ~800Hz and 12dB/oct crossover? if so, might cancel pretty well
    when connected incorrectly (woofer and horn audio out of phase when they "meet").
    I see what you're saying. I have a JL Audio app that has an RTA. I used the Db meter function of it to set horn level, so I should also be able to see a dropout at 800 hz if I back away from them a little. Will give that a try when I get a chance.

  6. #21
    Senior Member Ian Mackenzie's Avatar
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    http://home.earthlink.net/~jmarkwart/index.html

    Contact Jeff Markwart if you want to explore insights on getting the best out of the Altecs.

  7. #22
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    Quote Originally Posted by Ian Mackenzie View Post
    http://home.earthlink.net/~jmarkwart/index.html

    Contact Jeff Markwart if you want to explore insights on getting the best out of the Altecs.
    Looks like he has a lot of experience, moreso on the coaxes. Looking over his site, my guess is that he would advise building 19 cabs and probably a similar xover network. Definitely a possiblility, but the 19 cabs are significantly larger, so I would want to make sure that was the best use of my square footage.

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  8. #23
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    Just been listening to them. There seems to be a little distortion at a certain frequency in one horn. I'll look at connections and the simple stuff. I built some stands to try out. Still deciding on finish.


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