Marshall 412 Repair pro tip from Doyle Audio

Don't rip out the cables from the speakers.

Category:

Education

Tags:

• Marshall
• Repair
• Doyle
• Audio
• Speaker
• 412
• Cabinet
• Celestion

[malkinmario]

Hello!. I aquired a 4 12 marshall cabinet for cheap that had the tolex ripped up badly. It appeared the previous owner actually tried to rip it up on purpose. So it did not look cool. I decided to remove the tolex and then realized the tolex may have a hand in the strength especially where the sides interlock on the corner edges. I like the cab in this video. Does removing the tolex impair the durability of the cabinet. Thanks!

[doyleaudio]

@malkinmario

Hi Mario,

Can't say with your cabinet the effect of integrity after removal of the Tolex. It could be very little or a lot depending on how well the wood working was done. In our cabinets it would have no effect. I recommend you totally strip the cabinet down. Sand it well, It would take about three to five beers worth of time. Then varathane the cabinet with an oil based satin finish. Put it on thin, three coats will improve the cabs integrity. The varathane will yellow nicely.

[ac23AQ]

You obviosly know a lot about cabs. I want to convert my Marshall Mode four cabinet (400w, 8ohms., 4x12 Celestion G12K-100) to a Stereo cab. I want to install a 1960 cab. plate; i know how to wire it and all, but wanted to ask you something about the construction of the cabinet. If and when i convert it, will run into any sound issues?Does the 1960 cabinet have seprate chamberes for each speaker because it is a stereo cab? Thanks.

[doyleaudio]

@ac23AQ Part 1

Great question.

I'm seriously down right pissed off with any company calling a 412, a "Stereo" cabinet when it actually doesn't have a wall to separate the cabinet into two (Stereo) chambers. You have the waves of one channel bleeding into and THROUGH the cone of the other speaker. They put in a $1. switch on the jack plate and boosted the price by $50.

The 1960 and most companies claiming stereo, don't have a chamber wall. Our DCE412 is a true stereo but cost 25 million dollars.

[doyleaudio]

@ac23AQ Part du

If your a very good wood worker you can add a separating wall. It will involve a lot of bracing for the wall to be anchored. Problem is your center wall will have to be removable. If you ever want to repair the grill cloth, you will have to remove the baffle wall through the back along with the new wall. Depending on the quality of your fit, you may get buzzing, especially with k-100's (Love that deep tone) I recommend you look out for one of ours used. LOL Or drink more Beer.

[randygonet]

Hi, Jerry This may interest you, I have a Peavey guitar cab 1990's when my apt flooded, the two bottom speakers had water on them up to just below the center cone. It sat for a day like that.

I let it dry out for a week and nothing was damaged.

Do you think they may be ruined? they don't sound weird or anything and seem to work fine, they are Celestion G12K-85. They are at least 15 yrs old. This happened three years ago by the way.

Thanks, Randy

[doyleaudio]

@randygonet

Interesting. Speaker cones are relatively tough. If the water didn't soak into the voice coil and didn't cause corrosion and most importantly its sounding the way you wouldn't it, I don't see a reason for fixing something that's not broke. I would recommend you spend the money on Beer and Chicks. That's just my professional opinion.

G

G12K-85 is one of my favorite sounds. The G12K-100 is the same speaker.

[TheMadninjamike]

If only I had seen this BEFORE I opened my cab the first time...

[bravenXD]

What is your opinion on the Tone and the advantages/disadvantages of Rear mounted Speakers vs.Front Mounted Speakers?

[JBL8863]

@ac23AQ The cab is wide open similar to the cab in this video...Be careful tilting the back pannel off it's secured by the middle screw thats in the middle of the cabinet and yes Marshall dosen't give you much streching room after the back is off..

I rewired my M cabs using heavier gauge wire and metal clips purchaced at Autozone after I swapped out speakers...

You can use any watts speakers combined but the ohms have to be the same. 30 watts gives you faster break up but you loose bass.