MT121s and MHB4818s pics

Hi mate - ok, so here is my confession, and I suspect it's actually similar for most people who've built this cab. I didn't measure or even pre-plan these angles. They are so tight, and there is no machine (that I own!) that can cut such a tight, pre-determined angle, so I just used a palm sander and kept going and trying until they eventually fit. Lots of trial and error. Making both horns (one for each speaker) definitely took a good full day I'd say. Honestly, there are so many angles in this design, and none of the plans I could find online were really helpful in terms of angles, so it was just a lot of figuring it out as I went. In other words, I used the plans for the size of the panels, but when it came to all the angles that was sort of just figured out as you go. I don't think I pre-planned or pre-determined a single angle for these.

Edited by Neilt001 - 29 January 2026 at 5:54pm

Neilt001 wrote: Hi mate - ok, so here is my confession, and I suspect it's actually similar for most people who've built this cab. I didn't measure or even pre-plan these angles. They are so tight, and there is no machine (that I own!) that can cut such a tight, pre-determined angle, so I just used a palm sander and kept going and trying until they eventually fit. Lots of trial and error. Making both horns (one for each speaker) definitely took a good full day I'd say. Honestly, there are so many angles in this design, and none of the plans I could find online were really helpful in terms of angles, so it was just a lot of figuring it out as I went. In other words, I used the plans for the size of the panels, but when it came to all the angles that was sort of just figured out as you go. I don't think I pre-planned or pre-determined a single angle for these. Sorry for the late reply. Let me know if any more questions!

Oh yes this is right. I actually spent a lot of time on YouTube looking at various different jigs. But even then I wasn’t sure what angle to use even if I did make a jig. I know it would’ve been better using a table saw for these angles, for a number of reasons, but I just ended up sanding until things fit ha!