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Post subject: Mustang V Head with Marshall Cab
Posted: Mon May 09, 2011 2:56 pm
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Hello Everyone!

A total newbie here on the forum and I would like to ask for your advice on connecting my new Mustang V Head to my Marshall Cab please.

I have tried to find the answer myself, but am still unclear; on page 6 of the manual it states the following:

The Mustang V head amplifier provides stereo speaker outputs that must both be connected to a stereo speaker cabinet such as the Mustang V 412, with four 12" Celestion® G12P Rocket 50 speakers (recommended), or two 8Ω speaker cabinets capable of handling 75W each.

What I have is the following:

100W 4X12 Marshall Vintage Modern 425B Cab that is mono/stereo switchable and is loaded with G12C 25 Watt Celestion Greenbacks.

It says it is "16 Ohms/4 Ohms mono 8 Ohms stereo"

Will I harm my new Amp by switching the Cab to "Stereo" and then connecting BOTH outs from the amp to the two inputs on the Cab?

I know I have to keep the volume down so I don't blow the speakers out, but I just am not sure if I can hook this cab to it and since this Amp is my new "baby" I really don't want to hurt it in any way.

One last question, since this is solid state, can I listen to it thru my headphones without the cab being connected OR does it operate like a tube amp and must always have the cab connected to it or it will burn-up?

Thank you in advance for any help and I look forward to being a part of the Fender Community.


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Mon May 09, 2011 3:32 pm
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I can't answer the question about the Marshall cab. I have 1960A and 1960B cabs that I bought for my DSL 100. I've been wondering the same. I have heard that some cabs work and some don't. The Marshall cab is wired for stereo or mono. I'm not an amp expert, but since it is a SS and not a tube amp that needs a load on it, I wouldn't think it wouldn't hurt to try, if you do have that cab anyway. Just make sure it is switch it to stereo.

There was someone else here that tried something similar, but not to a Marshall cab. I don't remember what it was. It didn't work because of how the speaker was wired so he rewired it and it's working now. I don't think he hurt anything in the process.

I think when headphones are plugged into the headphone jack it takes the speaker out of play so to speak. That way you won't hear the speaker, but I could be wrong. What is the point of having a headphone jack if the sound is still coming out of the speaker too? I haven't tried mine out, I think I may have to give it a shot on Wednesday.


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Mon May 09, 2011 5:54 pm
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Yes,i 'am the one who posted about the problem i originally had with my mustang v hooked up to my line 6 4x12 stereo cab.make sure your marshall is in the stereo position 8 ohms per channal and that it is wired in true stereo!my line 6 is a 8 ohm stereo cab but it was not wired in true stereo and when i first hooked my mustang v to it i got a loud rapid fire type sound(i thought it was the mustang v head but it was the line 6 cab at fault),i had to rewire the two input jacks on the back of the cab so each right and left side top and bottom speakers were connected independently to each input jack,(-+) (-+).here is also a statement about this from fender. :::Important Notice for Fender® Mustang™ V Head Owners:::

Your Fender®Mustang™ V head requires completely independent connections to each 8 Ohm speaker load, which the stereo Fender® Mustang™ V cabinet offers. While it may be possible to run your Mustang™ V head with other speaker cabinet(s), FMIC offers no warranty that all cabinets will work


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Mon May 09, 2011 7:17 pm
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Another way to say it is.... The two "sides" of the cabinet cannot share a common ground. Many stereo cabinets have the speakers' "Hot" leads switchable either separately (stereo) or combined in parallel (mono). But the two input jacks are installed on a metal place that connects the "ground" leads of the speakers in common.

While this works in many tube amps, many solid state amps have a "push-pull" output stage that works independent of the chassis ground. These must have the two speaker jacks isolated from one another or one channel of the amp wil interfere with the other.

On most speaker cables, the "hot" lead is the tip of the 1/4 inch plug, and the "ground" is the sleeve of the plug.

For the jacks in the speaker cabinet to be isolated, they must either be mounted on a non-conductive surface, and the sleeve connections must NOT be soldered to each other. Or they must use isolated plastic (or other non-conductive) jacks that keep the ground connectors isolated from each other.

You can check your cabinet by plugging two different cables into the separate jacks and using a circuit tester (VOM, Continuity tester, Multi-meter, etc.) to test if there is any contact between the two ground connections (the sleeves of the two plugs). If there is no common connection, you are good to go. If there is continuity between the jacks, you have some work to do on the jack panel of the speaker.

BTW, Isolated jacks will also work with tube or solid state amps that do NOT require them to be isolated, because the grounds will be made common to each other through the plugs when connected to the amp. So if they are modified for use on the M5 they should also work on your favorite stereo tube amp.

Ken

Metalman50 wrote:
Yes,i 'am the one who posted about the problem i originally had with my mustang v hooked up to my line 6 4x12 stereo cab.make sure your marshall is in the stereo position 8 ohms per channal and that it is wired in true stereo!my line 6 is a 8 ohm stereo cab but it was not wired in true stereo and when i first hooked my mustang v to it i got a loud rapid fire type sound(i thought it was the mustang v head but it was the line 6 cab at fault),i had to rewire the two input jacks on the back of the cab so each right and left side top and bottom speakers were connected independently to each input jack,(-+) (-+).here is also a statement about this from fender. :::Important Notice for Fender® Mustang™ V Head Owners:::

Your Fender®Mustang™ V head requires completely independent connections to each 8 Ohm speaker load, which the stereo Fender® Mustang™ V cabinet offers. While it may be possible to run your Mustang™ V head with other speaker cabinet(s), FMIC offers no warranty that all cabinets will work

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Pastor Ken - NM9P

1976 Alvarez Acoustic w/fishbine pickup; '98 American Series Strat (custom rewired); Modded Gibson Les Paul.
Mustang III; Crate v33 2-12; Raven G20; Digitech RP-2000; Morley Bad Horsie 2; various Danelectric stomps ...


Last edited by nm9p on Wed May 11, 2011 10:51 am, edited 2 times in total.

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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 3:49 am
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+++1 The above should be made a "sticky". About every month/week this issue comes up.

Very good post on the issue and the solution. I had to figure it out the hard way!

Blessings, Bo Baker


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 1:33 pm
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Hello Everyone,

I want to thank each one of you for taking time to help me out on this, your replies are very much appreciated!!

I had read Metalman50's post and all the replies during my search to answer this question and his was the closest to what I was trying to find out but I was "cautious" (nice way of say AFRAID) to plug both sides in at the same time because I didn't want to burn my brand new amp up (I was thinking in terms of tube amps which is all I've ever owned).

After reading jcwillow777's comments about Solid State not needing a load like a tube amp, I started to feel a little braver about trying the cab.

I had to read nm9p's reply several times to get it thru my thick skull what he was saying but then the light went on and the clouds parted and I'm pretty sure I heard an angelic choir singing in the back ground, so I got a multimeter and tested the connections and the display didn't move an inch!!!!!! I it was then that I realized I was practicing "Safe Amp" :)

I connected both outputs of the amp to both inputs, plugged in my guitar, held my breath, turned on the amp, and listened for a helicopter........ nothing!! I then turned up the volume of the guitar and amp hit a chord and WOW "MUSIC SWEET MUSIC"

I want to once again thank you guy's for your kindness in taking time to answer my question; I hope this thread will help future newbies too.

I just thought of another thing: do you guy's use the red-tipped cables that came with the amp to connect to the cab?? I am probably still thinking like a "tube" guy here, but they look like the wire is really thin in them....... I have been using Planet Waves 14AWG Oxygen Free Copper speaker cables on my Marshall's, however, if the cables that came with the amp are OK I'll just use them.

God Bless each one of you and thanks again!!!!!!!!


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 4:44 pm
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Glad to hear it's working for you. I have been thinking about getting a MV head too, I have both 1960A and 1960B cabs that I bought with my Marshall DSL, but I'm only using the DSL and 1960A at church. A little overkill, but I love the tones I get out of it! I have the 1960B in my studio hooked up to a Marshall 18 watt clone I built.

As far as the cables go, if they sent them with the amp they should be good enough, but I hear you on cables. I am running 14 guage speaker cables into my speaker cabs. I would probably buy heavier ones if it was me, just because the heavier the cable the easier the sound travels from amp to speaker.

I am absolutely loving my MIV and really kope I can get my Vox VT50 working so I can sell it and get an MIII to replace it.


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 9:57 pm
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Str@man wrote:
I just thought of another thing: do you guy's use the red-tipped cables that came with the amp to connect to the cab?? I am probably still thinking like a "tube" guy here, but they look like the wire is really thin in them....... I have been using Planet Waves 14AWG Oxygen Free Copper speaker cables on my Marshall's, however, if the cables that came with the amp are OK I'll just use them.

God Bless each one of you and thanks again!!!!!!!!


You should buy good quality speakers cables for your MV Head when connecting it to your cabinet. I use Monster Performer 500 Speaker Cables. They are excellent speaker cables. The 3 foot cable should be sufficient.



Image


Last edited by bootmee on Tue May 24, 2011 9:24 am, edited 1 time in total.

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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 11:39 pm
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Hi bootmee, thanks for the info man!


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Tue May 10, 2011 11:54 pm
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jcwillow777 wrote:
Glad to hear it's working for you. I have been thinking about getting a MV head too, I have both 1960A and 1960B cabs that I bought with my Marshall DSL, but I'm only using the DSL and 1960A at church. A little overkill, but I love the tones I get out of it! I have the 1960B in my studio hooked up to a Marshall 18 watt clone I built.

As far as the cables go, if they sent them with the amp they should be good enough, but I hear you on cables. I am running 14 guage speaker cables into my speaker cabs. I would probably buy heavier ones if it was me, just because the heavier the cable the easier the sound travels from amp to speaker.

I am absolutely loving my MIV and really kope I can get my Vox VT50 working so I can sell it and get an MIII to replace it.


Thanks for your reply. I used to use my Marshall at Church too, but it was the cab that
has the 8X10's (talk about overkill, lol); I still have it, but it is 16ohms so I can't use my new Fender head on it...

Good luck on getting the Vox up and running and getting another Mustang, I'm really loving this amp!


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Wed May 11, 2011 10:55 am
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Str@man wrote:
Hello Everyone.....,
<snip>
I had to read nm9p's reply several times to get it thru my thick skull what he was saying but then the light went on and the clouds parted and I'm pretty sure I heard an angelic choir singing in the back ground, so I got a multimeter and tested the connections and the display didn't move an inch!!!!!! I it was then that I realized I was practicing "Safe Amp" :)
<snip>
God Bless each one of you and thanks again!!!!!!!!


I have made a few edits to my post, hopefully it is now easier to understand. I was pretty tired when I wrote it, and have made several small edits to it over the past several days!

Glad you got things working! Anytime anything I write turns the light on for someone, I rejoice, 'cause it happens so seldom! <grin>

_________________
Pastor Ken - NM9P

1976 Alvarez Acoustic w/fishbine pickup; '98 American Series Strat (custom rewired); Modded Gibson Les Paul.
Mustang III; Crate v33 2-12; Raven G20; Digitech RP-2000; Morley Bad Horsie 2; various Danelectric stomps ...


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Post subject: Re: Mustang V Head with Marshall Cab
Posted: Wed May 11, 2011 11:47 am
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nm9p wrote:
I have made a few edits to my post, hopefully it is now easier to understand. I was pretty tired when I wrote it, and have made several small edits to it over the past several days!

Glad you got things working! Anytime anything I write turns the light on for someone, I rejoice, 'cause it happens so seldom! <grin>


LOL, I hear ya Brother :-)

Just so you know, your info was good I'm just one of those people that it takes a while to comprehend things, wish I wasn't, but, that's just the truth :)

I'm sure that your post, as well as the other replies, will help a lot of people in the months and maybe even years to come; I know I appreciated everyone's input.


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