Marshall Cabs Farting Out

  • Thread starter Thread starter Bad.Seed
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Lots of valid ideas on this thread, but just out of curiosity do both of these cabinets have plastic handles on the sides? I had an old Marshall cab with plastic handles that ended up starting to make noise , and I replaced them with the Marshall metal ones, and it totally cured the problem. . .

The symptoms are the cabinet buzzes bad and almost sounds like blown or overtightened speakers. . Doesn't cost a penny to diagnose though. . While playing loudly just have someone hold the handles and if the buzzing stops you know what the problem is.


Eric
 
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This problem is called "The Kinks syndrome". Basically, your fellow guitarist is secretly angry with you and slashing your speakers and sticking knitting needles in them when you are not around. The good news is that soon you will discover a new type of tone and the world will worship what you have done.
 
Bad.Seed said:
Both cabs are on the ground with no casters at the moment. The floor coupling could be part of the issue, now that you say this
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Could be. I have a Thiel 1x12 copy that is thick as can be on the ground but gets super thin on an amp stand.
 
I think it would be most efficient to just take it in to a good tech honestly. When I had these issues in my ubercab, no one on here got it right in diagnosing the issue, but they meant well and I appreciate it, but my tech fixed it and the speakers were all fine in my case. I would’ve spent a lot more time and money if I didn’t bring it in
 
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Bad.Seed said:
I had the k85s in the old peavey Butcher cab prior and they sounded incredibly tight and punchy with no woof in that cab, so I really think it's the cab that is the issue. On the other hand, I put the 75's in an old yamaha cab and they sound fine in there, but I still don't love them. But no fart or breakup from the cab. So either it's the cab itself, or the room it's in at this point.
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I had the same cab; 200 bucks and it sounded damn good. Didn't have the 'snap' of a Marshall cab but it was very tight sounding with my Coliseum. No farting/woofing at all.
 
braintheory said:
I think it would be most efficient to just take it in to a good tech honestly. When I had these issues in my ubercab, no one on here got it right in diagnosing the issue, but they meant well and I appreciate it, but my tech fixed it and the speakers were all fine in my case. I would’ve spent a lot more time and money if I didn’t bring it in
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There can only be so many things affecting the cab..maybe it needs to be re wired with better gauge wiring? Also, those cabs come with questionable stereo pcb boards that sometimes fail. Re wiring it mono with better wire might work wonders. Buying 10 ft of lamp cord at a hardware store will be cheap upgrade and may fix the problem.
 
Racerxrated said:
There can only be so many things affecting the cab..maybe it needs to be re wired with better gauge wiring? Also, those cabs come with questionable stereo pcb boards that sometimes fail. Re wiring it mono with better wire might work wonders. Buying 10 ft of lamp cord at a hardware store will be cheap upgrade and may fix the problem.
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All these things are possibilities, who knows. Of course my cab is completely different, but others mentioned the same possibilities for me and none were the case. I just think it’s more trouble than it’s worth personally not to just have a good tech look at it, but if he and others are more tech savvy unlike myself than why not give it a try I suppose
 
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Racerxrated said:
There can only be so many things affecting the cab..maybe it needs to be re wired with better gauge wiring? Also, those cabs come with questionable stereo pcb boards that sometimes fail. Re wiring it mono with better wire might work wonders. Buying 10 ft of lamp cord at a hardware store will be cheap upgrade and may fix the problem.
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I'm tech savvy enough when it comes to cabinets and wire,etc. The gauge of the wire won't matter. I have a mid 70's Marshall with the thinnest gauge you can imagine and it's perfect. Also have an 80's Engl 4x12 and many 2x12's with thin gauge wire and they all are perfect. Obviously if there are bad/cold solder joints though that can make intermittent connections, sounds like like 'farting out' . . About 25 years back I got my 1st Bogner 2x12 and it had the thickest guage wire imaginable (maybe what 10 guage?) . .Anyway, I have many other cabs and that's the ONLY one with thick speaker wire inside, and wouldn't account for what Kyle's issues are. As for the connections on a pcb board, yes that can cause the farting out sound, as could overtightend speakers, grillcloth/grill vibrating, handles vibrating, or center post not attached, or attached correctly/tight enough. Oh well, he'll figure it out hopefully

Eric
 
ericb said:
I'm tech savvy enough when it comes to cabinets and wire,etc. The gauge of the wire won't matter. I have a mid 70's Marshall with the thinnest gauge you can imagine and it's perfect. Also have an 80's Engl 4x12 and many 2x12's with thin gauge wire and they all are perfect. Obviously if there are bad/cold solder joints though that can make intermittent connections, sounds like like 'farting out' . . About 25 years back I got my 1st Bogner 2x12 and it had the thickest guage wire imaginable (maybe what 10 guage?) . .Anyway, I have many other cabs and that's the ONLY one with thick speaker wire inside, and wouldn't account for what Kyle's issues are. As for the connections on a pcb board, yes that can cause the farting out sound, as could overtightend speakers, grillcloth/grill vibrating, handles vibrating, or center post not attached, or attached correctly/tight enough. Oh well, he'll figure it out hopefully

Eric
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The wire part makes sense to me because my Ubercab always had those super thick wires (when it was farting out as well), so sounds like that variable can likely be ruled out
 
braintheory said:
The wire part makes sense to me because my Ubercab always had those super thick wires (when it was farting out as well), so sounds like that variable can likely be ruled out
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I've re wired mono a few JCM 900 cabs and it always sounded better getting rid of that stereo pcb board. My goal was mostly to wire it mono; the heavier gauge lamp cord was just the cheapest/easiest way to do it.
I agree on the 70s cabs sounding killer; I have 3 now and have owned another 2 in the past. All 5 are killer cabs at volume. I also have an 83 800 B cab that smokes as well. All different speakers.
 
Not sure if it's been mentioned yet, have you checked the output tubes on your amp?
Old tubes can sound pretty flubby all by themselves.
 
Did you tightened the screws too much? Used a + pattern for tighten the screws? There is a post of Scumback how to mount speakers in a cab...
If you are sure are the speakers issue, try to remove them and check if the basket is bent.
 
Luca79 said:
Did you tightened the screws too much? Used a + pattern for tighten the screws? There is a post of Scumback how to mount speakers in a cab...
If you are sure are the speakers issue, try to remove them and check if the basket is bent.
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No sir, always take great care in doing this as to NOT overtighten and bend the baskets. Always use a crisscross tightening pattern as well. It happened when the original stock speakers were in the cab as well.
 
[ Donnie B. ] said:
Not sure if it's been mentioned yet, have you checked the output tubes on your amp?
Old tubes can sound pretty flubby all by themselves.
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Not sure if you saw in the original post but both my guitarist and I have a bunch of amps and usually don't bring the same one to each practice, but the issue is still consistent.
 
The only problem I ever had with my 900 cabs was with the center post.
I added a piece of foam between the post and the back board to fix it.
Not too sure if this would help.
 
Maybethe speakers are not yet broken-in. Could happen even with old speakers if not used for some years.
 
Bad.Seed said:
Not sure if you saw in the original post but both my guitarist and I have a bunch of amps and usually don't bring the same one to each practice, but the issue is still consistent.
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Reading comprehension is a great thing. I'll work on it.

I'll agree with others on the cabinet and bracing. If the cabinet isn't sturdy enough it's
going to absorb some of the low end energy and turn it into mush.
 
Crank those cabs up in another room to eliminate that possibility. Is there drums, or any other points for vibration etc.? An earlier post mentions a screw through the center of the rear panel into the sound post, do your cabs have these screws? I have a pair of 1960ax cabs, one left Marshall with said screw, the other did not. In my experience, if it is unsecured the rear panel will vibrate on that post at higher volume levels.
 
mikey said:
Crank those cabs up in another room to eliminate that possibility. Is there drums, or any other points for vibration etc.? An earlier post mentions a screw through the center of the rear panel into the sound post, do your cabs have these screws? I have a pair of 1960ax cabs, one left Marshall with said screw, the other did not. In my experience, if it is unsecured the rear panel will vibrate on that post at higher volume levels.
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The back panels have the screws through the post. No foam though.
 
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