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7pi build [message #91284] Mon, 23 December 2019 18:34 Go to next message
grimberg is currently offline  grimberg
Messages: 4
Registered: October 2017
Esquire
I am planning to build a pair of 7pi speakers and started preparing the project chart. I will use the JBL 2226H, Delta 10A and B&C DE250-8. I have a few initial questions.

1) Which horn to use with the tweeter?
2) The plan does not show where the binding posts should be placed on the woofer's cabinet. I am thinking the same panel on which the woofer is installed, correct?
3) Same as above for the mid-horn cabinet. The binding posts should be installed on the rear panel, right?
Re: 7pi build [message #91285 is a reply to message #91284] Tue, 24 December 2019 13:25 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17777
Registered: January 2001
Illuminati (33rd Degree)

Very good! I think you will be quite pleased with your project.

To answer your questions, the tweeter flare is the H290C waveguide. It doesn't need to be installed in a cabinet, but is more attractive when enclosed. You are free to use your imagination, but keep the waveguide close to the midhorn.

We used to offer a wood horn/waveguide but have ceased production of it after we made the H290C mold. The wood version was attractive but very expensive.

Some people just sit the midhorn on the bass bin and the tweeter on top of the midhorn. Others like to permanently mount the midhorn and tweeter. They mount the crossover in the bass bin and pass the wires through internal connectors to the midhorn and the tweeter.

I personally like to put connector plates on all three subsystems, and to put the crossover in its own little box. I sit the crossover box on the bass bin behind the midhorn. I also like to pin together the three subsystems rather than permanently attaching them or just leaving them sitting unattached. See the link below for positioning pin details and other tips:
Re: 7pi build [message #91471 is a reply to message #91285] Wed, 19 February 2020 12:48 Go to previous messageGo to next message
grimberg is currently offline  grimberg
Messages: 4
Registered: October 2017
Esquire
I have just received the H290C horns purchased from Pi Speakers. The B&C DE250-8 documentation specifies the bolts as M6 but does not mention how deep they should go. Could you tell me what length M6 bolts should I use?
Re: 7pi build [message #91473 is a reply to message #91471] Wed, 19 February 2020 13:44 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 17777
Registered: January 2001
Illuminati (33rd Degree)

The DE250 compression driver comes with studs and nuts that are the perfect length. Just use the mounting hardware that comes with the drivers.
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