Page 1 of 2 12 LastLast
Results 1 to 15 of 16

Thread: New project preparation

  1. #1
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014

    New project preparation

    I have been helping a friend of mine getting started with a nice little 3-way project.

    2235's (not yet acquired), 2425's and 2405's.

    We wanted to crossover at 6-800Hz and 8-10KHz. The smith horn was not an alternative since it would be very large (wide) when redesigned for 1" driver and a crossover frequency of 6-800Hz.

    He liked the look of the Altec 811, so we took a tractrix contour and recalculated it into a sectoral / biradial horn.

    I have made a prototype from particle board with my belt sander.

    The first response graph is really encouraging. Will probably make jig for routing the profiles more accurate.

    The horn has been painted black since this photo. I took measurements before and after painting. The paint smoothened the response curve.

    I have not played music on it yet, but hope to do so soon.
    Attached Images Attached Images   
    Johnny Haugen Sørgård

  2. #2
    norealtalent
    Guest
    More pics, more pics, please more pics...

  3. #3
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    I've made a jig for routing these horns. Still a lot of work routing, but the shape of the horns is more accurate.


    I have made one new horn using the jig.

    There is a hump from 700 to 1500Hz. Not sure why. They also roll off a little early. The Smith prototypes also had the same problem, so I will make a new mounting plates and try to smoothen the throat a little.

    For the moment they are replacing the smith's in my 4-way setup. With the 2425 drivers. In this setup they play 1200-7000Hz. First impression is good. Will be back with more impressions later.
    Attached Images Attached Images     
    Johnny Haugen Sørgård

  4. #4
    RIP 2013 Rolf's Avatar
    Join Date
    Apr 2003
    Location
    Skien, Norway
    Posts
    2,298
    Quote Originally Posted by yggdrasil
    I've made a jig for routing these horns. Still a lot of work routing, but the shape of the horns is more accurate.


    I have made one new horn using the jig.

    There is a hump from 700 to 1500Hz. Not sure why. They also roll off a little early. The Smith prototypes also had the same problem, so I will make a new mounting plates and try to smoothen the throat a little.

    For the moment they are replacing the smith's in my 4-way setup. With the 2425 drivers. In this setup they play 1200-7000Hz. First impression is good. Will be back with more impressions later.
    You are quite a wood-wizard Johnny...

    Rolf

  5. #5
    Senior Member Flodstroem's Avatar
    Join Date
    May 2004
    Location
    Norway
    Posts
    472

    -Impressive home made equipment - I must say.

    yggdrasil! Im impressed

    Very nice home made milling machine for the routing process. I can see that you could make any sizes of horn mouth in this jig.

    Do you have any "blue prints" of it ? If yes, could you send me a PM ?

    Regards
    Flodstroem

  6. #6
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    The project have been finished a couple of months now. Things really do take time.....

    Here's a couple of pictures a while back. The 2405's have gotten their own stands and both the stands and the mid-horns have the same finish as the main cabinets.

    I have attached the frequency response of the mid - hf section. It is an average of ~50 samples, no other smoothing.
    Attached Images Attached Images    
    Johnny Haugen Sørgård

  7. #7
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    I designed the crossover with 24dB slopes on both the 2425 and 2405 while giving the 2235 12dB slopes.

    I added zobels on all drivers.

    The l-pads are built with resistors (other values than in the drawing), and are chosen by measuring and listening.
    Attached Images Attached Images  
    Johnny Haugen Sørgård

  8. #8
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    The horn has Tractrix profile. The profile and overview of parts drawings are attached.
    Attached Images Attached Images   
    Johnny Haugen Sørgård

  9. #9
    Senior Member spkrman57's Avatar
    Join Date
    Feb 2005
    Location
    Columbus, Ohio
    Posts
    2,018

    Neat project!

    I'll keep watching as I too love horns for audio!

    Regards, Ron
    JBL Pro for home use!

  10. #10
    Member
    Join Date
    Feb 2007
    Location
    N. California
    Posts
    83

    Xover points

    What are the crossover points of your system?

  11. #11
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    8,200
    Hey those look nice!

    Rob
    "I could be arguing in my spare time"

  12. #12
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,735
    Quote Originally Posted by yggdrasil View Post
    The horn has Tractrix profile. The profile and overview of parts drawings are attached.
    ...and you made those horns with your belt sander.... damn!

    Looks great! Congratulations.


    Widget

  13. #13
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    Quote Originally Posted by CauYem View Post
    What are the crossover points of your system?
    750Hz & 10KHz
    Johnny Haugen Sørgård

  14. #14
    Super Moderator yggdrasil's Avatar
    Join Date
    Dec 2004
    Location
    Våle, Norway
    Posts
    1,014
    Quote Originally Posted by Mr. Widget View Post
    ...and you made those horns with your belt sander.... damn!
    Actually they were made with a jig similar to the one in post #3....
    Johnny Haugen Sørgård

  15. #15
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,735
    Quote Originally Posted by yggdrasil View Post
    Actually they were made with a jig similar to the one in post #3....
    Still very impressive... I have quite a bit of patience in the wood shop... not sure if I have that much.


    Widget

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Fundraising request; donations to Lansing Heritage Project May loudspeaker project
    By mikebake in forum Lansing Product General Information
    Replies: 7
    Last Post: 04-21-2011, 12:37 PM

Posting Permissions

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