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I don't recall, off hand.

'Pends on your point of view, I guess. For playing electric guitar and such, if you like the sound of it, you're good. For high fidelity reproduction of recorded music there is a long history of...

The D130 and 130a frames are different. There are reconers who will cross load them, but it creates frankenwoofers.

Is the 515c like the 416 or like the G610?

I never built it, but I sure thought about it plenty. What I think is this: The Imperial was designed for a driver I had, the Jensen G610, a "triaxial" driver and woofers of the same generation. ...