Page 13 of 13 FirstFirst ... 3111213
Results 181 to 191 of 191

Thread: DIY-project: JBL Kebnekaise S4365

  1. #181
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    Quote Originally Posted by pos View Post
    Those look great and well integrated!
    I bet you already started listening without horns

    Is that mattress foam you are using of open-cell type ?
    No listening yet. Will do the speakon speaker-cables today (using Canare 4S11-cable).

    I will use the LSR305:s as tops, until I get the horns (just some temporary textbook electrical LR24 crossover at 80Hz is my plan).

    Don't know about the foam. I was recommended this mattress by speaker-people in Sweden that has measured it in closed boxes, and compared it to other damping materials.
    It is this one:
    https://jysk.se/sovrum/madrasser/sku...10#store_stock

    It comes compressed, and kind of expands over the course of 2 days. So it sets itself a little bit tighter inside the box, I think.

  2. #182
    Senior Member ivica's Avatar
    Join Date
    Jan 2008
    Location
    serbia
    Posts
    1,519

    Sound Absorption Coefficients

    Quote Originally Posted by bubbleboy76 View Post
    ...
    Don't know about the foam. I was recommended this mattress by speaker-people in Sweden that has measured it in closed boxes, and compared it to other damping materials.
    It is this one:
    https://jysk.se/sovrum/madrasser/sku...10#store_stock

    It comes compressed, and kind of expands over the course of 2 days. So it sets itself a little bit tighter inside the box, I think.
    Hi
    Comparison between the diffuse field sound absorption coefficients of:
    sheep wool sample S4,
    mineral wool,
    recycled polyurethane foam and
    polyester fibers (PET).



    https://www.ncbi.nlm.nih.gov/pmc/art...10-01277-f007/

    regards

    ivica
    Attached Images Attached Images  

  3. #183
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    Quote Originally Posted by ivica View Post
    Hi
    Comparison between the diffuse field sound absorption coefficients of:
    sheep wool sample S4,
    mineral wool,
    recycled polyurethane foam and
    polyester fibers (PET).



    https://www.ncbi.nlm.nih.gov/pmc/art...10-01277-f007/

    regards

    ivica
    I have seen something like this before, a combination of sheep wool and foam seems to be good for
    my box inteded range (20-650Hz).
    someone told me that it is best to have sheep wool closest to the element.

  4. #184
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    Horn box design.

    The bottom will be openable with a lid.

    I have left the idea of enabling a vertical horn position. But, the box will be able to be put in the middle between the LF-boxes, if I would want an MTM-topology later in life.
    Attached Images Attached Images   

  5. #185
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    Work in progress.
    Attached Images Attached Images    

  6. #186
    Senior Member pos's Avatar
    Join Date
    May 2007
    Location
    Paris, France
    Posts
    2,401
    The black and white contrast will certainly look nice on that one!

  7. #187
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    The plan was to paint it all white.
    But now you make me hesitate.

  8. #188
    Senior Member 1audiohack's Avatar
    Join Date
    Jul 2007
    Location
    Las Vegas Nevada
    Posts
    2,494
    That is stellar work! Very nice.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  9. #189
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    Adding bat-slayers to the mix.
    Bought a pair of 045be from ebay. Thanks Johanwholst for the tip!
    I hope they work....

    From this graph it seem they will not need much dsp when used 10-20KHz.

    There will be comb-filtering with the crossover to HF horn with 476mg. Maybe very steep slope would be applicable here? I have FIR-capability, so I can do very steep, if I want.

    My HF horn/driver beaming starts at 8KHz. So the plan is to crossover at 8-10Khz somewhere.
    Attached Images Attached Images  

  10. #190
    Senior Member
    Join Date
    Oct 2014
    Location
    Iceland
    Posts
    126
    Testing mine at down to 10k as we speak. They do a fine job down there with a steep crossover

    Hope they arrive in good shape. Im sure you will like them

  11. #191
    Senior Member
    Join Date
    Nov 2008
    Location
    Gothenburg, Sweden
    Posts
    673
    What is the lowest frequency a JBL 476mg compression-driver can play safely, without risk of damaging it long-term? Let's assume a 48dB/oct high-pass filter, and "normal" home-listening levels. And H4365 horn-loading.
    Anyone?

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, 01:37 PM
  2. Project May, similar privat project?
    By Flodstroem in forum Lansing Product DIY Forum
    Replies: 14
    Last Post: 02-21-2007, 03:42 PM
  3. 3 Way Project
    By luxmanlover in forum Lansing Product General Information
    Replies: 19
    Last Post: 10-26-2004, 02:13 PM
  4. Project K2
    By electrostatics in forum Lansing Product Technical Help
    Replies: 3
    Last Post: 08-30-2004, 02:15 AM
  5. Fundraising for Project May Loudspeaker project
    By mikebake in forum Public Forum - Announcements
    Replies: 0
    Last Post: 02-10-2004, 08:15 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
  •