+ Reply to Thread
Results 1 to 4 of 4

Thread: Altec 511 / 811B

  1. #1
    J.A.F.S.
    Join Date
    Aug 2005
    Location
    On the move in the Motorhome!
    Posts
    341

    Altec 511 / 811B

    What is the difference between the Altec 511 / 811B sectoral horns?


    Thanks!
    Amazed I'm still alive!
    Tim

  2. #2
    Obviously... not a golfer grumpy's Avatar
    Join Date
    Oct 2003
    Location
    SoCal
    Posts
    4,176
    size matters

    511 is larger. Other than rare E-suffix 511 units, all I've seen (811 and 511)
    are two bolt 1" inlet horns. Check out the Library section here...

    -grumpy

  3. #3
    Senior Member Steve Schell's Avatar
    Join Date
    Jun 2003
    Location
    Long Beach, CA
    Posts
    1,425
    The two horn types are of very similar design; the main difference is that the 511 loads the driver to 500Hz., while the 811 loads the driver to only 800Hz. Both horns need a crossover points of these respective frequencies (or higher) to protect their drivers. The 811 was made earliest, and replaced the H-808 multicellular horn in Altec's lineup.

    There are variations within type. The original 811 (1952) was a one piece casting and had mouth fins that bowed outward. It was soon replaced by the 811A, a two piece welded design. Later the A was replaced with a cost-reduced 811B, thinner and lighter in weight. As far as I know the first 511 was the 511A, later replaced by the lighter weight 511B.

    Both designs are basically radial horns, though they have initial throat sections that create some on axis beaming of high frequencies. Many people feel that the 511 series sounds quite a bit better than the 811 series, even apart from its ability to load down to 500Hz. These are all cast aluminum horns, and benefit sonically from damping of their exteriors. A couple of ziplock bags of sand placed on top is a good start.

  4. #4
    J.A.F.S.
    Join Date
    Aug 2005
    Location
    On the move in the Motorhome!
    Posts
    341

    Talking

    Thanks for the info guys!
    Amazed I'm still alive!
    Tim

+ Reply to Thread

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Altec vs. JBL vs. TAD
    By RacerXtreme in forum Lansing Product DIY Forum
    Replies: 21
    Last Post: 10-11-2007, 03:52 PM
  2. Plantronics to Acquire Altec Lansing
    By watchman in forum Lansing Product General Information
    Replies: 10
    Last Post: 08-31-2006, 10:04 AM
  3. Cabinet / X-Over for Altec 3156 / 511 Horn
    By Wibe in forum Lansing Product DIY Forum
    Replies: 4
    Last Post: 07-23-2006, 03:14 PM
  4. Altec 811b + what driver?
    By Al Klappenberge in forum Lansing Product Technical Help
    Replies: 20
    Last Post: 02-03-2004, 10:35 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts