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    Speaker Ohms and the Grandmeister

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    ShatteredVitreous

    Posts : 6
    Join date : 2016-05-05

    Speaker Ohms and the Grandmeister

    Post by ShatteredVitreous on Thu May 05, 2016 3:33 pm

    Evening all

    Been a grandmeister owner for about a year now and have only ever used it to record via the Red Box.

    Just joined a band so picked up a speaker cab, a marshall 8222 with gt12t100's in.

    I don't want to damage my amp so just wondering if I could get some advise. The back of the cab says left 8ohms, right 8ohms and mono 4ohms. As you are all aware the grandmeister supports 8-16ohms out of a single mono output.

    If I run the amp into the the left 8ohm connector am I running at 4ohms and will this damage the amp/cab?

    Would really appreciate your help, and man what a damn good amp.

    Mike

    NZ_Nick

    Posts : 16
    Join date : 2015-10-15

    Re: Speaker Ohms and the Grandmeister

    Post by NZ_Nick on Thu May 05, 2016 4:01 pm

    I think it must currently be wired in parallel when in mono - so 2X 8ohm = 4ohms.
    You might need to rewire it so that it is in series which will be 2x 8ohms =16ohms which is safe gor the GM36.

    See the diagrams below. Will pay to check what the current wiring is though.



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    ShatteredVitreous

    Posts : 6
    Join date : 2016-05-05

    Re: Speaker Ohms and the Grandmeister

    Post by ShatteredVitreous on Thu May 05, 2016 5:44 pm

    Thank you Nick, this is what I thought from reading over a few posts but just wanted to be sure.

    It's not a problem to do but I'll check the wiring first.......can't wait to crank the GM on Sunday at rehearsal.

    Thank you again fella

    Mike
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    ShatteredVitreous

    Posts : 6
    Join date : 2016-05-05

    Re: Speaker Ohms and the Grandmeister

    Post by ShatteredVitreous on Sat May 07, 2016 1:44 pm

    Nick

    Checking the wiring and it seems that the two inputs ( left and right) are connected individually to each speaker. The two inputs are then wired together.

    Is this then splitting the signal so 2 x 8ohms = 4ohmn?

    In which case would you advise changing it to a series configuration?

    Mike
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    ShatteredVitreous

    Posts : 6
    Join date : 2016-05-05

    Re: Speaker Ohms and the Grandmeister

    Post by ShatteredVitreous on Sat May 07, 2016 1:45 pm

    Nick

    Checking the wiring and it seems that the two inputs ( left and right) are connected individually to each speaker. The two inputs are then wired together.

    Is this then splitting the signal so 2 x 8ohms = 4ohmn?

    In which case would you advise changing it to a series configuration?

    Mike

    NZ_Nick

    Posts : 16
    Join date : 2015-10-15

    Re: Speaker Ohms and the Grandmeister

    Post by NZ_Nick on Sat May 07, 2016 7:50 pm

    Its probably like the pic below. With a switched jack on the right.

    I would rewire it so it uses a single jack and is in series to produce 16Ohms.


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    ShatteredVitreous

    Posts : 6
    Join date : 2016-05-05

    Re: Speaker Ohms and the Grandmeister

    Post by ShatteredVitreous on Sat May 07, 2016 11:56 pm

    Hi Nick

    I change the speaker configuration last night and tested, worked perfect so thank you for your help.

    Mike

    NZ_Nick

    Posts : 16
    Join date : 2015-10-15

    Re: Speaker Ohms and the Grandmeister

    Post by NZ_Nick on Sun May 08, 2016 1:50 am

    Awesome, glad I could help. Have fun, its an awesome amp.

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