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1705 Views 8 Replies Latest reply: Nov 17, 2009 1:58 AM by mtrash14 RSS
danhughes Just Startin'
danhughes
6 posts since
Dec 17, 2008
Currently Being Moderated

Nov 15, 2009 2:18 PM

Spider valve 212 combo

Can I run two 16 ohm G12-75 celestion speakers in my spidevalve combo? I want to use the vintage 30's in a 1936 marshall cab. Thank you

  • pikeral Just Startin'
    pikeral
    123 posts since
    Feb 5, 2009
    Currently Being Moderated
    Nov 15, 2009 2:33 PM (in response to danhughes)
    Re: Spider valve 212 combo

    Yes you can. Make sure you wire them up the same as the original V-30's.

    • mtrash14 Iknowathingortwo
      mtrash14
      539 posts since
      Feb 18, 2009
      Currently Being Moderated
      Nov 15, 2009 4:29 PM (in response to pikeral)
      Re: Spider valve 212 combo

      The 2x12 comes with two 16 ohms V-30 wired (plus to plus - minus to minus) parallel so the output is 8 ohms load.  Replace the V-30's with two other 16 ohms speakers and wire them the same (plus to plus - minus to minus) and you will have 8 ohms again.  No problem so far.

       

      If you wire up your new cab with your old V-30's parallel also then you could use all 4 speakers at the same time if you wanted (both cabs).  Just switch your combo's speaker wire to one of the "B" inputs then hook up that extention cab also.  Those two 8 ohm parallel loads together would give you a 4 ohms total load, which is what output "B" is supposed to have.  Cool

       

      Good luck

      M^T

      • danhughes Just Startin'
        danhughes
        6 posts since
        Dec 17, 2008
        Currently Being Moderated
        Nov 15, 2009 5:44 PM (in response to mtrash14)
        Re: Spider valve 212 combo

        Thank you, so when I put the vintage 30's in the marshall cab installed as the g12-75's are I can run them at 16 ohms out of the marshall VM 100 ?

        • mtrash14 Iknowathingortwo
          mtrash14
          539 posts since
          Feb 18, 2009
          Currently Being Moderated
          Nov 16, 2009 3:27 AM (in response to danhughes)
          Re: Spider valve 212 combo

          Those V-30's are 16 ohm speakers.  With that in mine - a 2x12 of them can either be wired Parallel = 8 ohms  or   Series = 32 ohms. 

           

          The only way to get 16 ohms from a 2x12 cabinet full of 16 ohms speakers is to only hook to one of them, then the load would indeed be 16 ohms.  When you tie the second speaker in its going to be either 8 ohms or 32 ohms - depending how you wire them up. lol

           

          Visualizing how this works is easy if you think about simple resistors.  A resistor in a line has a 'resistance value'.  Tack on another resistor in parallel of the same value to the legs of the first resistor and you cut the total resistance in the line in half because the current can go through both resistors at the same time.  The formula for our cabinet would look something like:  (16x16) / (16+16), or  256/32=8.

           

          Series would be when you have a resistor in a line then add another resistor onto the end of it.  Now you add the resistance of this second resistor onto the resistance of the first resistor because the current must pass through each of them one at a time.  The formula for your cabinet would look something like:  16+16=32.

           

          Thats why a 2x12 with 2 - 16 ohm speakers can be wired either 8 ohms or 32 ohms. lol

           

          Hope this helps

          M^T

          • LoonyBin-Fizzbin Gear Head
            LoonyBin-Fizzbin
            2,070 posts since
            Mar 26, 2007
            Currently Being Moderated
            Nov 16, 2009 5:21 AM (in response to mtrash14)
            Re: Spider valve 212 combo

            +1

             

             

            BUT!!!  (No offence intended at all)

             

            I think there must be some kind of confusion in the works here?

             

            This cab that has 2 x 12 ´s ? are each speaker 16 Ohms? or is the Total output of the Cab 16 Ohms?  I ask this because I don´t know  or heard really of a Stereo Marshall head? Nor of a Mono (Marshall Head) that has a 32 Ohms input!  So this is setting off my alarm bells!

             

            Disclaimer: I do not know or claim to know every Marshall Product either.

             

             

             

             

            Or! At your expense you can also use another 2 x 12 cab,

             

            So both cabs are in series individually, (32 Ohms each cab) then place/connect the 2 in a Parallel circuit. 32/2 = 16 Ohms.

             

            Does your Amp have multiple taps? This is usual or normal! But not the rule!

             

             

             

             

            This is what I found for the Marshall Vintage Modern 2466

             

             

            Here: http://www.marshallamps.com/downloads/files/VintMod%20hbk%20Eng.pdf

             

            6. Speaker Outputs
            WARNING! Never use the amplifier without a load
            (speaker cabinet/s) attached!
            There are two parallel loudspeaker output jacks
            provided for connection to speaker cabinet(s).
            ALWAYS ensure you use good quality speaker
            (unshielded) cables. NEVER use guitar (shielded)
            cables.
            Always use a non-screened Marshall approved
            speaker lead when connecting an extension cabinet
            to these units.
            7. Output Selector
            This switch should be set to match your speaker
            cabinet’s impedance. If more than one speaker
            cabinet is connected then you should set the switch
            to match the total impedance of the combination.
            Check with your dealer if you are unsure.
            16 & 8 ohms are provided for on the heads (2466
            and 2266).
            8 & 4 ohms are provided for on the combo (2266C).
            Note: The impedance of the combo’s (2266C) own
            speakers is 8 ohms. Make sure the combo’s output
            selector is set to 8 ohms when no extension cabs
            are connected

            • danhughes Just Startin'
              danhughes
              6 posts since
              Dec 17, 2008
              Currently Being Moderated
              Nov 16, 2009 7:18 PM (in response to LoonyBin-Fizzbin)
              Re: Spider valve 212 combo

              Thanks for all your replies, looking at the back of the marshall cab 8 ohms should be correct for mono and 16 ohms for stereo. I just assumed I would be using 16 ohm for one cabinet. I just got the head today and set it up an hour ago. It's freekin awesome but it does need an overdrive or boost pedal for more gain. I'm going to try the fulltone ocd pedal, maybe just as a booster but if I need to I can add more gain. I still like my spider valve its going in the living room so I'll be reminded that I should be playing my guitar not watching the boob tube. Thanx,dan h

              • mtrash14 Iknowathingortwo
                mtrash14
                539 posts since
                Feb 18, 2009
                Currently Being Moderated
                Nov 17, 2009 1:58 AM (in response to danhughes)
                Re: Spider valve 212 combo

                danhughes wrote:

                 

                looking at the back of the marshall cab 8 ohms should be correct for mono and 16 ohms for stereo.

                Those are wired singles and parallel. When used in singles (stereo) each plug is 16 ohms.  When used in parallel (mono) the combination of both speakers will give you 8 ohms.

                 

                You understand all this now I think!!!!!

                 

                good luck man

                M^T

    • danhughes Just Startin'
      danhughes
      6 posts since
      Dec 17, 2008
      Currently Being Moderated
      Nov 15, 2009 5:42 PM (in response to pikeral)
      Re: Spider valve 212 combo

      Thank you very helpful

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