Mojotone 12” to 10” Baffle Converter, Eminence GA10-SC64, Jensen C10Q, Jensen C10R

I’ve owned a Roland Cube 60 modeling amp since 2004. I outgrew it once I started getting into playing though tube amps and VST amp modeling. I wanted to separate the amp into a head and cabinet so I could get more use out of the amp. Unfortunately I learned that the Cube 60 baffle cutout was too small for typical 12” speakers. The stock full range Roland Cube 12” speaker is a different shape than a typical 12” guitar speaker.

Roland Cube 60 Cabinet with
Mojotone 12” to 10” Baffle Converter.

I didn’t have a way to cleanly enlarge the hole in the baffle. The easiest option in my mind was to use the cabinet for a smaller 10” speaker. I ran across plywood baffle converters from J Design and Mojotone. I went with the Mojotone, since it was suited for front mounting of speakers. The Mojotone converter comes with 4 keps nuts to hold a 10” speaker onto the converter’s speaker mounting bolts. I bought some slightly longer M4x35mm bolts to mount the converter onto the Cube’s MDF baffle. The stock speaker mounting bolts are M4x25mm.

I will be trying out a Jensen C10Q and an Eminence GA10-SC64 in the cabinet. Based on my encouraging experiences with recording with the Jensen P10R speaker, I want to explore more flavors of 10" speakers with my 5F1/5F2A head and Pro Junior IV. 

If the cabinet records well and I can make some useful impulse responses out of it, then I plan on buying some more 10" speakers to rotate in and out. I will keep the metal grille off, so the front loading of speakers should lead to quick speaker swaps. I am hoping that the front porting and the inside insulation will not significantly impact the sound negatively in a close mic'd scenario.

Edit - 6/11/21 - I loaded the Eminence GA10-SC64 into the cabinet. I finger tightened the keps nuts of the baffle to secure the speaker. I got the feeling that the baffle is actually meant for rear loaded installations, but will proceed with using it as a front loaded cabinet.

Cabinet front loaded with speaker.

2021 Eminence GA10-SC64 Speaker. 

Jensen C10Q.

Edit - 06/25/21 - The GA10-SC64 is very different from the P10R. I am not familiar with the nuances of American-style speakers, since there aren’t as many online audio examples as the British-style speakers. The P10R works well with tweed overdrive, while the GA10-SC64 fares better with cleans for my usage. The GA10-SC64 is not harsh, even with a microphone pointed directly at the center of the dust cap. Blends of my GA10-SC64 and P10R IR captures are pleasing, as the speakers seem to be complementary. 

Capturing GA10-SC64 IRs with a Shure SM57.

The Cube 60 cabinet’s ports don’t seem to exert a negative influence on the sound, so I intend to continue to experiment with more 10” speakers. I would like to eventually try an Eminence Red Fang 10 and a hemp cone speaker, after I familiarize myself with the GA10-SC64 and C10Q.

Link to GA10-SC64 IRs

Edit - 8/29/21 - I swapped in the Jensen C10Q speaker to see how it compares to the GA10-SC64. The swap was quick and painless, as I originally anticipated with the front-loaded exposed baffle. The C10Q is brighter than the P10R and GA10-SC64.

Link to C10Q IRs

My plans to get a British-flavored 10” speaker with the Eminence Red Fang 10 were dashed when Eminence discontinued the model this summer.

While purchasing a small hardware order for my 5E3 build, I came across a deal on a Jensen C10R speaker at $41 on Tube Depot’s website.

My main interest is to see how this small magnet ceramic speaker compares with the Alnico P10R and larger magnet C10Q.

Link to C10R IRs

To be continued.