Results 1 to 5 of 5

Thread: 4412 - channel balance

  1. #1
    Junior Member
    Join Date
    Nov 2015
    Location
    Denmark, Copenhagen
    Posts
    3

    4412 - channel balance

    Hi,

    I have just bougth a pair of 4412's and I noticed a shift in channel balance - especially for vocals and fine details.
    By adjusting the L-Pads I need one speaker at -2/-2 and the other at +1/+1 to get the balance sort of ok.

    Next planned step is to measure frequency response and impedance to check for any obvious faults but I was hoping for some guidance before I go further.

    Thanks
    Br Jesper

  2. #2
    Senior Member rdgrimes's Avatar
    Join Date
    Aug 2008
    Location
    New Mexico, USA
    Posts
    2,173
    The Lpads themselves can cause that, due to dirt/smoke/age/etc. Try spinning them all the way back and forth a bunch of times and see if it makes any difference.

  3. #3
    Junior Member
    Join Date
    Nov 2015
    Location
    Denmark, Copenhagen
    Posts
    3
    The L-pads may were well be the cause as the left one is pretty hard to turn.
    I did measurements just now and adjustment of left tweeter is not right. Level is much higher and does not look like the curves in the manual. The right speaker follows the curve in the manual to perfection. As this happens around 4Khz and the crosseover frequency is 3.5Khz I suspect one of the filter components.

    I think it is most likely the capacitors for the tweeter that are bad, but the L-pad might also be the cause?

    Left (red) and Right (Blue) speaker 40 cm from baffle with L-pads in neutral position
    Name:  left_right_0_0.png
Views: 151
Size:  57.8 KB

    Right speaker with different L-pad positions (+1, 0, -1, -2, -3, -4, -6, -10 and min)
    Name:  right_lpad.png
Views: 151
Size:  80.6 KB

    Left speaker with different L-pad positions (+1, 0, -1, -2, -3, -4, -6, -10 and min)
    Name:  Left_lpad.png
Views: 153
Size:  71.5 KB

    Left (red) and Right (Blue) speaker Left -10 / Right -3
    Name:  right_3left_10.png
Views: 148
Size:  55.9 KB

  4. #4
    Senior Member audiomagnate's Avatar
    Join Date
    Jan 2011
    Location
    Colorado and Georgia
    Posts
    1,014
    No two drivers are identical, and these have a lot a miles on them. The fact that they are dead equal at 10K makes me think it driver variation. I don't think a bad blocking cap would do that to the response above 10K.

  5. #5
    Junior Member
    Join Date
    Nov 2015
    Location
    Denmark, Copenhagen
    Posts
    3
    Quote Originally Posted by audiomagnate View Post
    No two drivers are identical, and these have a lot a miles on them. The fact that they are dead equal at 10K makes me think it driver variation. I don't think a bad blocking cap would do that to the response above 10K.
    Thank you, I will swap the drivers to check this.
    What do you mean by "dead equal at 10K" I see 7 dB difference at 10K? You mean 1K?

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. JBL 4412 mod
    By orbit1 in forum Lansing Product DIY Forum
    Replies: 4
    Last Post: 07-04-2011, 11:36 AM
  2. Help with balance XLR
    By richluvsound in forum Lansing Product Technical Help
    Replies: 38
    Last Post: 02-29-2008, 10:59 AM
  3. Center Channel 4425, 4412, 4410?
    By ooppalla in forum Lansing Product General Information
    Replies: 8
    Last Post: 01-18-2005, 06:00 PM
  4. JBL 4430 vs 43XX balance argument
    By slxrti in forum Lansing Product Technical Help
    Replies: 11
    Last Post: 05-13-2003, 08:21 AM

Tags for this Thread

Posting Permissions

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