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Unread 02-29-2008, 05:19 PM   #1 (permalink)
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How do you setup a full stack from half stack?

Simple question but I'm kinda wondering more about how the head acts differently between 1 or 2 cabs plugged in.

I have a VS100 head and cab. Now does the head work at 100watts thru the single cab right now....and if I get another cab, does the power switch to 50watts to each cab or...?

I have a buddy selling his Valvestate 1 Head and 4x10 cab and I wanna just use the cab and make mine a full stack.....possible or do I have to worry about ohms and all this?

Maybe its best to use both heads and cabs in a stereo effect? I'm not sure what to do.
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Unread 02-29-2008, 11:06 PM   #2 (permalink)
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Re: How do you setup a full stack from half stack?

I have an MG100HDFX full stack. The DFX has one speaker output and my HDFX has two. The Manual for my amp simply says that it puts out 100w RMS where the total load impedance is 4 ohms or more. It looks to me like even though it's two cables into two cabs, it gets treated like a single 8-speaker cab.

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Unread 10-28-2011, 09:40 PM   #3 (permalink)
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Re: How do you setup a full stack from half stack?

I have the exact full stack as you. with one cab ie halfstack you are running at 8 ohms, therefore only 50 watts. still a loud ************, but plug in the second 4x12 and now you are 4 ohms at 100watts RMS (keep it on mono,) it is a beast, and you will know where that extra money went to when you hear the difference in fullness and increas in bass, and the extra volume from doubling the wattage. It screams, no need for any pedals, just plug in and turn gain to 7 and master to like 6 or higher (i like 10) so I hoped that answered your question. PS, make sure you are using 1960 300 watt cabs for maximum effect.
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Unread 10-29-2011, 08:55 AM   #4 (permalink)
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Re: How do you setup a full stack from half stack?

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Originally Posted by Johnny Blade View Post
I have the exact full stack as you. with one cab ie halfstack you are running at 8 ohms, therefore only 50 watts. still a loud ************, but plug in the second 4x12 and now you are 4 ohms at 100watts RMS (keep it on mono,) it is a beast, and you will know where that extra money went to when you hear the difference in fullness and increas in bass, and the extra volume from doubling the wattage. It screams, no need for any pedals, just plug in and turn gain to 7 and master to like 6 or higher (i like 10) so I hoped that answered your question. PS, make sure you are using 1960 300 watt cabs for maximum effect.
Just wanted to mention that the output change that happens on solid state power amps does not happen on tube power sections. With tubes, the power rating is the same regardless of the impedance. Just something to keep in mind if you ever get an all tube amp.

Grampa, yes, you have to worry about the ohms (impedance), so check the marshall handbook for your amp and search the cabinet and speaker section of this forum if you still have questions. Post questions if you still need to. Keep these things in mind:

- If you have two 8 ohm cabs, the impedance will halve whether you plug each cab into inputs on the back (generally understood) or from one output > cab > cab (not generally understood).
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Unread 10-29-2011, 09:54 AM   #5 (permalink)
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Re: How do you setup a full stack from half stack?

You can use both cabs, but the power output of the amp will increase, not deacrease. You must understand though, how impedance works, and that solid state amps are different than tube amps.

As TPR mentioned, when you plug two cabs into an amp, they are connected in parallel, If each cab has the same impedance (ohms), then the total impedance will be cut in half. So if you have two 8 ohm cabs, the amp will behave as if you have one 4 ohm cab.

SS amps also have a minimum allowable impedance (probably 4 ohms, but it should be labeled on the back of the amp. Don't go below this.

And both heads and cabs will sound cool, but it won't be "stereo", unless you use them with a stereo effect, like chorus or something like that.
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Unread 10-29-2011, 10:00 AM   #6 (permalink)
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Re: How do you setup a full stack from half stack?

And what TPR also said about tube amps is true, different impedances will not change the output. They have an impedance selector switch that must be set to match the total impedance of the cabs, or you could damage the amp.
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Unread 11-01-2011, 09:29 PM   #7 (permalink)
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Re: How do you setup a full stack from half stack?

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And what TPR also said about tube amps is true, different impedances will not change the output. They have an impedance selector switch that must be set to match the total impedance of the cabs, or you could damage the amp.
no the speakers that came with mine have no impedance switch, they are basically MG series quality rated at 8 ohms each. I was just saying, for maximum results, this head screams when I use my 1960s, and your right, those do have a selector, but the VS-8100 has no switch for ohms. It has 2 outputs, and says "100 watts RMS at 4 ohms", and seeing as how both the cabs are mono, unswitchable 8 ohm cabs that the head came with, you need both 8 ohm cabs to make it into 4 ohms.
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Unread 11-02-2011, 08:06 AM   #8 (permalink)
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Re: How do you setup a full stack from half stack?

One less Cord?

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Unread 09-10-2013, 02:43 PM   #9 (permalink)
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New to everything guitar related cause I drum.

Ok first of all I have no idea what I'm doing with a guitar anyways but felt as a drummer that I need to learn it to understand how the two mesh so to speak. I won a custom Les Paul with open coil albino pick ups and a MG100HDFX. My question is will the Marshall Mg play by just plugging it in or will I need another amp to plug that I to for it to work?
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Unread 09-10-2013, 03:16 PM   #10 (permalink)
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Re: How do you setup a full stack from half stack?

Did you get a speaker cabinet with it? Or just the MF100HDFX head?
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Unread 09-10-2013, 03:50 PM   #11 (permalink)
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Re: How do you setup a full stack from half stack?

You need a cab, just the head unit has no speaker. Unless you just wanted to jam through headphones, in which case you're good to go. But why revive a two year old thread just to ask this question?
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Unread 09-10-2013, 04:20 PM   #12 (permalink)
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Re: How do you setup a full stack from half stack?

Dameinbeale, I only got the MFDX100. Thanks for the input. Kamran, threads don't die. Thanks for input guys.
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Unread 09-10-2013, 04:26 PM   #13 (permalink)
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Re: How do you setup a full stack from half stack?

Yup, you'll need a cab. Headphones are not particularly satisfying when it comes to guitar.
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Unread 09-10-2013, 04:38 PM   #14 (permalink)
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Re: How do you setup a full stack from half stack?

Thanks again gentlemen.
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Unread 09-10-2013, 04:47 PM   #15 (permalink)
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Re: How do you setup a full stack from half stack?

Oh, and a proper speaker lead too. DON'T use a guitar lead to connect between head and speaker cab, as it will not be able to handle the current, and add a lot of capacitance, which is not really what you want.
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Unread 09-10-2013, 06:23 PM   #16 (permalink)
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Re: How do you setup a full stack from half stack?

What do you recommend for a lead?
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Unread 09-11-2013, 01:57 AM   #17 (permalink)
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Re: How do you setup a full stack from half stack?

Any half decent speaker cable will do (plenty available in music stores). No point wasting big bucks here.
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Unread 09-11-2013, 09:24 AM   #18 (permalink)
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Re: How do you setup a full stack from half stack?

Real men play with their Tewbs ...
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Unread 09-11-2013, 01:13 PM   #19 (permalink)
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Re: How do you setup a full stack from half stack?

Well that was helpful, Dan...
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Unread 09-12-2013, 12:29 PM   #20 (permalink)
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Re: How do you setup a full stack from half stack?

helpful AND amusing
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