If you're comfortable with taking the speaker apart then I say go for it because you'll want to make sure the repair fills the entire crack. You may want to contact Spendor to see what they recommend that's compatible.
I am not a furniture repairman but having the kids knock stuff over (in addition to my contributions) I have repaired my fair share of wood products. About 8 or 9 years ago my boy climbed in the top dresser drawer & it fell out, breaking the corner off. I bought some Durham's Water Putty on the advise of a friend who worked at the best hardware store in town & made the repair. I just went & looked at it & it's like the day I made the repair. Only thing is you have to mix your color in with the patch.
I am not a furniture repairman but having the kids knock stuff over (in addition to my contributions) I have repaired my fair share of wood products. About 8 or 9 years ago my boy climbed in the top dresser drawer & it fell out, breaking the corner off. I bought some Durham's Water Putty on the advise of a friend who worked at the best hardware store in town & made the repair. I just went & looked at it & it's like the day I made the repair. Only thing is you have to mix your color in with the patch.