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Thread: 4343B rotary switch bypass single amp mode.

  1. #1
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    4343B rotary switch bypass single amp mode.

    First off I do not mind criticism so if anyone sees something that may be wrong please lets get it corrected. Hope this helps some.

    This is for the 4343B. Not sure if it is the same for other models. Goal is to bypass the rotary switch in single amp mode not biamp mode and to install new binding post on the LF (low Frequency) side. I left the switch in place in case in the future someone would like to use it. In the future I would like to upgrade the network and rewire. This is a cheap and fast upgrade. At this time I did not want to remove the networks so I did not follow the wiring into the networks and for this work there should be no need to unless the networks have been modified. If they were modified I would have went deeper. This is a stock 3143 network. Also make sure the wires on the rotary switch are the same color as on my switch. If not do not proceed.

    This picture is of the rotary switch in the single amp mode. As you can see I have numbered the switch. There are 2 levels on the switch the same numbering system applies to the lower part also. As you can see in single amp mode 1 yellow and 2 green do not make contact. 2 green and 3 brown do make contact. This is true for the rest of the switch.
    Name:  single amp.JPG
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    For reference this is the switch in biamp mode. As you can see the 1 yellow is now making contact with the 2 green.Name:  biamp.JPG
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    The picture below shows that the HF (high frequency) side has 2 posts that are not joined (connected). The LF side has 2 posts that are joined (connected).
    Name:  LF joined HF not joined.jpg
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  2. #2
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    The following steps are what I did to bypass the switch in single amp mode. Reference the single amp mode picture above for numbering of the switch.

    1. Cut black wire 2 places on HF negative and upper switch position 6. Name:  upper 6 cut.JPG
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    2. Cut black wire 2 places LF negative and upper switch position 4. Name:  upper 4 cut.JPG
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    3. Cut blue wire 1 place on upper switch 5.
    Name:  upper 5 cut.JPG
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    4. Cut black wire 1 place lower switch 12.
    Name:  lower 12 cut.JPG
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  3. #3
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    5. Cut 1 side HF negative side black wire that goes back into box and connect this wire blue wire going back into box and black wire on LF negative binding post.
    Name:  wires joined for lf ground.JPG
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    6. Cut black wire 2 places lower switch 11 and at HF negative.
    Name:  lower 11 cut.JPG
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    7. Cut white wire with black stripe 2 places lower switch 10 and HF negative post.
    Name:  lower 10 cut.JPG
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    8. Cut orange 12 and white 11 upper switch one place each then join them together. These go back into box.
    Name:  upper 11_12 cut joined.JPG
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  4. #4
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    9. Cut green 2 and brown 3 upper switch one place each then join them together. These go back into box.
    Name:  upper 2_3 cut joined.JPG
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    10. Cut yellow wire 2 places upper switch 1 and LF positive.
    Name:  upper 1 cut.JPG
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    11. Cut yellow wire with black stripe 2 places lower switch 7 and HF positive post.
    Name:  lower 7 cut.JPG
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    12. Cut yellow wire 2 places upper switch 10 and HF positive post.
    Name:  upper 10 cut.JPG
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Size:  93.9 KB

  5. #5
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    13. Cut yellow wire 2 places lower switch 8 and at HF positive post.
    Name:  lower 8 cut.JPG
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    14. Cut yellow wire 2 places upper switch 8 and HF positive post.
    Name:  upper 8 cut.JPG
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    15. Cut yellow 1 place on HF positive post. This wire goes back into box. I did not take a picture of it cut but cut it where shown.
    Name:  HF yellow to box cut.jpg
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    16. Cut red wire 1 place upper switch 9. Wire goes back into box.
    Name:  upper 9 cut.JPG
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  6. #6
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    17. Cut yellow wire 1 place lower rotary 9.
    Name:  lower 9 cut.JPG
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    18. Join red and yellow that goes back into box with yellow off of the LF positive post.
    Name:  red yellow inside joined with LF yellow postive.JPG
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    19. While I was at it I decided to change the LF positive and negative post. When I did this it allowed me to get rid of the yellow wire on the LF positive post and the black wire on the LF negative post.
    Name:  finished.JPG
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    20. I then soldered all joints (connections).

  7. #7
    Senior Member Goldjazz's Avatar
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    great job

    Nicely done Warpig. You've done a much better job documenting this than I had planned to. My switch was similarly corroded and nasty. Many of the contact points were no longer making proper contact and at least one was also shorting on the screws holding the thing in. As mentioned in the other thread I noticed an improvement in biamp mode removing it out of the path, hope you did too

  8. #8
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    Goldjazz thanks. I know some of this stuff can be unnerving. I wanted to make it so most anyone could do it. If someone has a set of 4343B speakers and the wire coloring is the same as mine then this should work as long as the network was not modified previously. I am going to follow this thread for a little while, while it is still fresh in my head in case I can answer any questions. Also would recommend anyone doing this to take pictures and do one speaker at a time and test when one is completed.

    Myself I did one speaker then did a test using different frequency test tones from the link below. You can download wav files.
    http://www.audiocheck.net/audiofrequ...r_sinetone.php
    Doing the test it became apparent I need to rebuild the networks. I do believe the caps are way out of tolerance.

    Take Care
    greg

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