Guitar Talk & Reviews with Bob Molton

Here’s an email I received from a satisfied client of mine
that recently did a tone make0ver on his 4×12 cabinet.
He was pleasantly surprised with the results and
I wanted to share them with all of you.

=> Please comment If You Liked This Post.
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Hi Bob,  I just recently discovered your Marshall 4×12 setup video. Thank you so much.

I not only ADORE the sound I am getting out of the cabs now, I loved doing the work on them.

My 2 cabs were very new and every screw needed tightening, center braces off center, and one actually had less than 18AWG in it.

I never imagined I’d be the one to fix them up but thanks to your inspiration, I did

Nice silicon caulk beads, re-wired both with 18AWG, resoldered all connections (No more clips). Center brace remounted to front (Removed staples and replaced with 1″ dry wall screws and wood glue to boot.

I also centered the post without drilling a new hole.  I set the back plate on askew by 45 degrees, guided the center screw into my pre-tapped centered post hole, tightened with a couple turns, then repositioned the back plate correctly, then tightened the center screw down the rest of the way.

My bottom end is marvelous

All this improvement has inspired some curiosity.
What would a 2×4 for a center brace do for my sound?

What kind of sound change would replacing the 4 GT12-75s with V30s?

Thanks again Bob, you’re a Peach!
Joey
Seattle

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Thanks Joey for the feedback!
I wanted to answer your questions.

?????? ??????Question: All this improvement has inspired some curiosity.
What would a 2×4 for a center brace do for my sound?

Answer: We’ll that’s actually a good question and I’m glad you asked.
The more mass you have in between the front baffle and the back panel will
definitely change the focus of the sound. It should actually be a bit more aggressive
and tighter. You’ll notice a difference in the  response, and sound pressure level.

IMPORTANT: if you do this is critical that you make sure the length is the same as the
original post. It needs to be slightly longer to create the force against the back panel.
I hope this helps.

Question: What kind of sound change would replacing the 4 GT12-75s with V30s?

Answer: Another really good question. The GT 12-75′s are actually good all around
speakers for a balanced low end and a balanced top end, however if you like a really
focused mid-range sound with a punchy tight low end, the Vintage 30′s are the way to go.
I’ve used both for years and can say that the GT 12-75′s tend to get a bit saggy on the bottom
and lose the character at high volumes. The Vintage 30′s really project accurately at high
volume levels. The vintage 30-H is recommended, Or the Van Halen Vintage celestions.

Please leave your comments or questions below.
Rockin Your Guitar Success!
Robert Lee Molton