Will the Yamaha SB3X-2 French horn silent brass work for a marching mellophone?

Question

I play both French horn and marching mellophone, and was wondering if the Yamaha SB3X-2 French horn silent brass pickup mute would work for the mellophone, so I don’t have to buy a second mute end.

Answer 1

The Yamaha website lists the Silent Brass SBX Series, including the SB3X-2, here:
https://usa.yamaha.com/products/musical_instruments/winds/silent_brass/silent_brass/

There, there is a link to a Compatibly Table for the SBX Series. Right up the top of this page it says:

The Pickup Mute is not compatible with Piccolo Trumpets, Alto (Tenor) Horns, Baritones, Alto Trombones, Bass Trombones or Marching Brass Instruments.

Also, down the bottom of the page there is a Please Note section, the second dot point says (quite explicitly):

The Pickup Mute is not compatible with Marching Mellophones, Marching French Horns, Alto (Tenor) Horns, or Baritones.

So unfortunately, it looks like the SB3X-2 won't work for your marching mellophone.

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According to the Yamaha website the SBX series is actually discontinued, but even the new SBJ series of pickup mutes apparently doesn't have a model that is compatible with marching brass instruments.