54L Sealed DPL12 Test Results

Discussion in 'Home Theater Projects' started by Peter DeWitt, Nov 19, 2003.

  1. Kyle Richardson

    Kyle Richardson Screenwriter

    Joined:
    Jan 1, 1998
    Messages:
    1,073
    Likes Received:
    0
    If you bought it recently then its probably not the boosted version but its worth it to open it up to see what resistors are in the amp to make certain they didnt send the wrong one by chance.

    Also, can you take a picture of the spider and tinsel leads?

    BTW, it would be best to have the DPL12 side firing becuase of the soft suspension.
     
  2. Geoff L

    Geoff L Screenwriter

    Joined:
    Dec 9, 2000
    Messages:
    1,693
    Likes Received:
    0
    Brian/Kyle

    Dose anyone know if the instructions that come with the current un-boosted version (300-794),,,,,,,, in fact make "Mention of the Boost"????

    Seems odd to me that they make mention of it in Peters instruction manual! I have not purchased any PE-250's sence the dual model choice change over.
    I have only purchased Rythmik's amps as of the last year or so.

    I would have thought only the 796 would make mention of a boost in the instructions. Obviously sence that model carrys the it.

    Regards
    Geoff
     
  3. Brian Bunge

    Brian Bunge Producer

    Joined:
    Sep 11, 2000
    Messages:
    3,716
    Likes Received:
    0
    I think the instructions for both amps are basically identical but I have not looked at them in a while. Most of the subs I've built in the last few months have used higher excursion drivers and I too have been buying rythmik amps.
     
  4. Peter DeWitt

    Peter DeWitt Extra

    Joined:
    Nov 19, 2003
    Messages:
    20
    Likes Received:
    0
     
  5. Peter DeWitt

    Peter DeWitt Extra

    Joined:
    Nov 19, 2003
    Messages:
    20
    Likes Received:
    0
    Well, curiosity got the best of me. The resistors are 56K and 120K, these are the values for a non boost model.
     
  6. Kyle Richardson

    Kyle Richardson Screenwriter

    Joined:
    Jan 1, 1998
    Messages:
    1,073
    Likes Received:
    0
    Peter, post the pic here so we can collectively take a look and try to solve the problem.
     
  7. Peter DeWitt

    Peter DeWitt Extra

    Joined:
    Nov 19, 2003
    Messages:
    20
    Likes Received:
    0
    I tested it in free air in both vertical and horizontal positions. The “abnormal” displacement happens in both the box and in free air. Obviously, the free air was more pronounced, but it was still very apparent in the box. At 20-25Hz, the displacement seemed relatively normal. However, when 30-40Hz was played, the displacement was large wrt the gain knob increase.

    I am going to check the amp with a scope this afternoon and check for a DC offset. If it’s not there I don’t know what to think.
     
  8. Peter DeWitt

    Peter DeWitt Extra

    Joined:
    Nov 19, 2003
    Messages:
    20
    Likes Received:
    0
    Here are links to pictures of the leads.

    Sorry I can't imbed them, the forum won't let me yet. Just ad http:

    Non Rattling Side
    //claymore.engineer.gvsu.edu/~dewittp/Non_Rattling_Side1.jpg

    Rattling Side
    //claymore.engineer.gvsu.edu/~dewittp/Rattling_lead1.jpg

    //claymore.engineer.gvsu.edu/~dewittp/Rattling_lead2.jpg

    Can I just bend the staycon tabs to make it more taught.
     
  9. Ronnie Ferrell

    Ronnie Ferrell Second Unit

    Joined:
    Jul 16, 2002
    Messages:
    355
    Likes Received:
    0
    imbeded photos:
     
  10. Ronnie Ferrell

    Ronnie Ferrell Second Unit

    Joined:
    Jul 16, 2002
    Messages:
    355
    Likes Received:
    0
    What about a little bit of polyfil under the tinsel leads? (I have no idea if it would help. Just tossing it out.)

    rf
     
  11. Kyle Richardson

    Kyle Richardson Screenwriter

    Joined:
    Jan 1, 1998
    Messages:
    1,073
    Likes Received:
    0
    Peter, YGM
     
  12. Peter DeWitt

    Peter DeWitt Extra

    Joined:
    Nov 19, 2003
    Messages:
    20
    Likes Received:
    0
    I think getting lost in all of this was my first line in the initial post:

     

Share This Page