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Fat Jimmy speakers?

Ok, I am assuming that this is a sealed cabinet (there are some Bassmans that are also ported, as well as reproductions and modified cabinets).

For this to have any meaningful low end, you will need a bass driver that's optimized for a sealed cabinet and not a ported cabinet. Most bass drivers are designed around ported cabinets (performance suffers in a sealed cabinet, that's why the complete specs are important) but there are a couple of options that work ok in a sealed cabinet:

1. The Eminence BassLite 2012 is a good middle of the road option with a nice balance between LF extension, mid voicing and sensitivity

2. The Eminence BP-122 is another option, a little better LF extension but darker in the mids and significantly lower sensitivity. For using with the Bassman 135, it wouldn't be my first choice. If you have more power and lowish volume requirements, it would be ok.

3. The Eminence Beta 12A is also ok in a sealed cabinet, kind of in between #1 and #2, not the brightness of #1 but brighter than #2.

Eminence Basslite 2012 conversion on my 1967 (or so) Bandmaster cabinet, the 32 x 20 x 11.5" version:

The studs that held in the original Oxfords didn't line up with the bolt-circle of Basslite 2012s, (or JBL E120s either) so "adapter-plates" are added:

1 w:one spk adaptor.jpg

The center-divider is augmented to tie the sides tightly together without closing off the two chambers from each other:

2 clamps Tying sides, Basslites in.jpg

Top, Bottom, and Sides are corner-blocked:

3 clamped cornerblocks.jpg

Additional glue-blocks, 1/4x1/16" closed-cell gasket is added to seal back to prevent air-leaks/buzzes:

4 Partway converted.jpg

Insulation. The blue stuff is shredded-denim, tan stuff is rock-wool.

5 Splunge.jpg

Basslites really are "light" (4.1# each) This whole completed project weighs 47#, including all original and added hardware and bracing (including the original tiltback legs, but not including the casterboard). I don't expect this "vintage conversion" to be a do-all solution for everything (I have options), I just prefer to rotate Bohemian setups when I can: The Shtick is Part of the Show (and the fun). This rig has a tone and vibe I like, it gets considerably louder than I expected, and it makes people grin.

rsz_1212_bandmaster_wttpct.jpeg
 
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