Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
No, they're not. You'll have to drill the H290C. When I had the mold made for the H290C, I wanted the extra thickness near the throat for strength, so I chose to omit the inner three mounting holes. The two-hole arrangement works for the B&C, Eminence and TAD drivers, as well as many others. But sadly, that makes the 2426 a little more work.