Speaker Connecting JVM410h

Discussion in 'Marshall Amps' started by Richardcopp, Aug 15, 2019.

  1. Richardcopp

    Richardcopp New Member

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    Good day all.
    I have finally purchased the amp I have always wanted! The JVM410h! Its been a while but I wanted this!! Please see the diagram below as I wanted to make sure I am connecting the speaker cabinet up correctly...

    BackAmp.png

    I also have included the 4X12 as I own this cabinet also.

    4x12.png

    Could someone assist with the best possible way to get the best/safest sound?
    I would be very grateful for your help
    Thank you

    Rich
     
  2. John BNY

    John BNY Well-Known Member

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    If plugging into the 1936, you should plug into the 1x8 ohm/2x16 ohm jack of the amp and into the right side jack of the cab (mono 8 ohm).
    If plugging into the 1960, plug into 1x16 ohm on the amp, set the cabinet to mono and plug into the right jack 16 ohm.
     
  3. John BNY

    John BNY Well-Known Member

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    Also, congrats on the new amp, and welcome to the forum.
     
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  4. Richardcopp

    Richardcopp New Member

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    Thank you very much

    I have had a DSL for many years but it has been a while since I have used the kit. I have always been a bit dim with the ins and outs on the back.
     
  5. Lance Chambers

    Lance Chambers Well-Known Member

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    You can also run both of the cabs @ 2x16 ohm. :jam:
     
  6. Richardcopp

    Richardcopp New Member

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    That sounds amazing! Which way would I connect ?
     
  7. Lance Chambers

    Lance Chambers Well-Known Member

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    DA93C0AD-E6A0-45A5-879F-4E512F268C02.jpeg
    Sorry I misspoke! For a brief moment I thought you had two 1960 cabs while I typed my first response.:facepalm:

    Although 16 OHM will work, you are essentially splitting the 1936 cab @ 16 OHM (which is useless). It will only operate one speaker.

    Set the 1960A cab to "STEREO". Use the "2 x 8 OHM" ports on the back of the JVM410H to run both cabs. Connect one cable to the right side "1 x 8 OHM" of the 1936 cab and the other cable to the 1960A cab. This will essentially give you four speakers (2 x 2 each) that you could place on each side of the stage/room.

    For a single cab setup simply follow John BNY's advice as mentioned earlier in post #2.

    I owe you a beer for the confusion. :cheers:
     
    Last edited: Aug 15, 2019
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  8. Jethro Rocker

    Jethro Rocker Well-Known Member

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    Actually you can with a 410. Connect the 1936 8 ohm speaker to the 4 ohm jack. Connect the 16ohm 4x12 to the 8 ohm jack. This is not mentioned in the manual as it can get complicated. This info is according to Santiago, the designer of the 410.
    This is NOT a mismatch.
     
  9. Jethro Rocker

    Jethro Rocker Well-Known Member

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    Here is an example of his posts
    santiall said:
    Plug the 16ohm cabinet into the 8ohm output and the 8ohm cabinet into the 4ohm output. That's perfect impedance match.

    santiall said:
    It says "MAY" not "WILL". The 16+8ohm configuration is a perfect match if connected to the right outputs as described elsewhere.

    Don't worry either about the output transformer myth, there is no problem with mismatching loads in any amps or splitting the load as long as there are available outputs, this is not any JVM exclusive feature, it is just plain physics. As long as there is a load connected properly you'll be safe, danger comes with intermittent connected loads, poor cabling, etc, but a mismatch by itself won't cause any harm
     
  10. MarshallDog

    MarshallDog Well-Known Member

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    Congrats on the new amp!!
     
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  11. spacerocker

    spacerocker Well-Known Member

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    I agree with all the above points....

    The connections look confusing until you realise that the vertical pairs of inputs are actually connected together! The only one that is on it's own is the 16Ohm

    So the "2x16/1x8" pair for example mean that those two sockets are connected to the 8 Ohm tap on the transformer. So if you connect a single 8 Ohm cab to one or the other, or two 16 Ohm cabs to both together, it is still a total of 8 Ohms connected to the transformer!
     
    Last edited: Aug 15, 2019
  12. Lance Chambers

    Lance Chambers Well-Known Member

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    I makes perfect sense! The higher the Ohm rating the easier it is on the OT.

    Who's got the next round? :pops:
     
  13. Jethro Rocker

    Jethro Rocker Well-Known Member

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    Each connection sees half the load it should. 2 halves equals one whole!!
     
  14. Richardcopp

    Richardcopp New Member

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    Thank you all for your help on this.

    :applause:
     

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