d130 in an imperial

[NickH]

can anyone tell how a jbl d130 would perform in a Jensen imperial back horn?

Or a great plains 416-8c is the other candidate.
Also does anyone know the lower cutoff frequency for the imperial?

thanks,
Nick

[speakerdave]

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. The surround on the woofer was a "w" corrugation of the cone paper. In other words, a driver with stiff suspension that was excellent in the midrange but not built for long excursion and therefore needed horn loading to produce much bass. A similar type of driver might work. The Altec 416 is not of that type. I wouldn't use the D130, but the 130A/2220 might work.

Before undertaking this very ambitious building project, I would look on every audio forum I could find and try to find someone with a report of success with it and I would use the same driver (if I believed the person, that is).

[NickH]

I was going to try and get the d130's I have defined to 130a drivers. They need to be reconed anyways since the cones ate shot. What do you think about the 515c.

[speakerdave]

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?

[NickH]

I've decided not to build the imperial for now. Im going to build a c34 and load it with the d130 or a d140. I was told the d140 has a little better bass response.

Ill do some research and try and find a driver that comes close to the jensen p15II. Maybe build the imperials down the road. Maybe a subwoofer.

The 515c is an altec driver for bass horns I think. It looks lik,e the g610 is a p15II with the added drivers.
Nick

[NickH]

Is a frankenwoofer a bad thing?

[speakerdave]

'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 technical accomplishment, whose apex is called the state of the art; you ignore it at your own risk.

[NickH]

What is the diffrence between the frames of a d130 and a 130a? know the 130a has a bigger magnet. Is the gap diffrent?



Nick

[speakerdave]

What is the diffrence between the frames of a d130 and a 130a? know the 130a has a bigger magnet. Is the gap diffrent?



Nick

I don't recall, off hand.