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HC15 speakers dull sound in mid and high range

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  • HC15 speakers dull sound in mid and high range

    Hello everyone. I am working with our church organist to understand what is going on with the sound in our organ. We have 4 HC15 speakers which I am confident has midrange speakers that need to be refoamed. The area where I am confused is that the brilliance (my term for crisp mid to high frequency sounds) seems to be missing. I have heard some say that HC15 speakers are muddy but I am wondering if it might be due to the midrange speakers needing to be foamed? Should I look at the tweeters as well? Thanks!

  • #2
    If the midrange speakers need to be refoamed, they will not produce much signal at all, making the entire sound very bass heavy.

    I suspect many would interpret this as "brilliance is missing" or that they are "muddy". A lot of what we hear as brightness is really midrange. After you fill a church full of sound absorbing people, pew padding, and maybe some carpeted aisles, there isn't much sound in the top octave to 2 octaves, making the midranges the source for what brightness can be heard.

    I doubt the tweeters are a source of any problem. They do not seem to deteriorate with age. But you can always check into them if the problem still exists after re-foaming or replacing the midrange units.

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    • #3
      Originally posted by mn_blue View Post
      I have heard some say that HC15 speakers are muddy but I am wondering if it might be due to the midrange speakers needing to be foamed?
      Welcome to the Forum!

      Was your quote from working speakers or damaged ones? I've heard that statement about the HC-12 speakers, but never the HC-15s. In fact, I've found the HC-14 & HC-15 speakers to be much brighter sounding than the HC-12.

      If you have HC-15 speakers and the mids haven't ever been replaced and they are used regularly, then you probably do need to have the surrounds replaced. Sooner is better than later, so it's good you're paying attention to the issue. Toodles is right on when he says the tweeters probably aren't the issue.

      To see examples of mids that need to be removed or replaced, you can see them in my gallery here: https://www.organforum.com/gallery/d...um=36&pid=1233

      Again, welcome to the Forum.

      Michael
      Way too many organs to list, but I do have 5 Allens:
      • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
      • Lowrey Heritage (DSO-1)
      • 11 Pump Organs, 1 Pipe Organ & 7 Pianos

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