Marshall Cabs Farting Out

  • Thread starter Thread starter Bad.Seed
  • Start date Start date
The Polyfill might be a neat trick, I've truthfully never looked into it. I have 2 Bogner helios cabs, but never tried removing the polyfill to see the difference with and without

I removed the poly fill off the back of my bogner cab. With it in, It does tighten up the bottom end, also seems to dry the saturation up a little.

I personally like it out, but in your case it probably works.
 
Its the back panel and the handles and all the hardware rattling.
Heres what i did to my jcm 800 1982 cab and ampeg 412. Which may i add were fine factory , til i opened em and did speaker swaps. Cant get em back no rattly after that. Or so it seemed.

-Dissassembled as much as possible
-Hardware store
-Got one box of Mortite (blue box cursive writing) weatherstrip and caulking cord
-thin stripped along edges the Mortite anywhere i could see would cause rattle
-back panel too. Be aware it makes the back panel harder to remove next time (i just remove my jackplates and lift there anyways but you may need to still pry em up)

Tight, solid, and 0 of that annoying rattle and "after" a note rattle ?
 
Also. I put mortite on the centerpost, handles, baffle, sides of baffle..anywhere i could remove or dissassemble the cab, i did and sealed it with mortite. The ampeg cab was worse because it had more screws, but literally, its just time and labor. The mortite is $6

Just for your fyi, I literally chased EVERY solution with my cabs mentioned in this post.

My Dad and I solved this and were stunned at how much tighter, and better my cabs sounded at stage volume. And for his part "he hated music, cant stand this guitar shit, get a job" but he ALWAYS helped.

So as much as a non guitar nerd opinion may not sit well with us tonally, it pays to have a non musical ear helping and confirming and adding non guitarist logic. Later, he helped me re-eq my rig so it didnt bother his ears at volume (no high end or bass, all mids, i hated it, i wanted scooped). But all the sudden I was "clearer louder" and sounded "better" than last gig. Dude knew his stuff for someone that hated music but created a complete guitar/amp gear freak in me.

Ill note as well, my rig was solid state mangling the sonic space with bass so theres that..i think that rig could have rattled any cab loose though.

Even worse how they sometimes do the "after note" vibrate a little at low volume and u go "wtf..oh well i can live with it".. then on stage fart city blah.

now that im all tube my cabs are dead silent because that square 11th order odd harmonic or whatever the f isnt bashing my cabinet's centerpost cervix with solid state 65hz.

Also; not all cabs will benefit from this. I did it with my Rivera dual theile q212 and couldnt get it and the poly fill back off.

Total pain in ass to unscrew and remove, i was pisssseddd! Haha
 
My 412 cabs arent poly filled

Were, before the Mortite, after totally unnecessary and dead sounding with.
 
My 412 cabs arent poly filled

Were, before the Mortite, after totally unnecessary and dead sounding with.
This mortite idea sounds very interesting. Would it work to use it in a cab like my Diezel 412 that’s front loaded and has a sealed back? Or maybe unnecessary in that one? It has no issues as is, but just wondering if it can make it even tighter and better sounding
 
This mortite idea sounds very interesting. Would it work to use it in a cab like my Diezel 412 that’s front loaded and has a sealed back? Or maybe unnecessary in that one? It has no issues as is, but just wondering if it can make it even tighter and better sounding
I think it'll work with any loose rattly cabinet. Even maybe farty open back ones like muh good ol Tourmaster combo? Hmmm
The rivera dual theile i tried it with is front loaded but of all things, the rattle was the air moving the wires so I zip tied them tighter.
None of my other cabs do this. I was shown at a music store to NOT over tighten speakers and only go one crank hand tight on the x pattern w screws. So i knew it wasnt over tight or bent frames.
i think it could b ya ticket
 
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