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4 Pi plan [message #81601]

Tue, 29 September 2015 07:13

Sixela666
Messages: 4
Registered: September 2015
Location: Belgium

Esquire

Hello,

Can you send me the 4Pi plans.

Thanks a lot.

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Re: 4 Pi plan [message #81602 is a reply to message #81601]

Tue, 29 September 2015 11:47

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

You've got mail!

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Re: 4 Pi plan [message #81604 is a reply to message #81602]

Fri, 02 October 2015 07:49

Sixela666
Messages: 4
Registered: September 2015
Location: Belgium

Esquire

Thank you,

i will order 2 horns soon.

Do you have a metric version of the plan ?

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Re: 4 Pi plan [message #81607 is a reply to message #81604]

Sun, 04 October 2015 12:20

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

Sorry, no metric version of any of our plans is available. But it's a fairly simple cabinet, and you can use a conversion program to calculate each dimension.

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Re: 4 Pi plan [message #81821 is a reply to message #81601]

Thu, 24 December 2015 03:28

Sixela666
Messages: 4
Registered: September 2015
Location: Belgium

Esquire

Hi,

I will start to build a pair of 4pi soon,

H290c are ordered, B&C 250 will be ordered soon, pair of 2226h & new tools are at home.

I have three questions :

About the crossover,
- Can r2a, r2b, r2c, r2d be replaced by their equivalent resistances which is ... 16Ohms.
- Same for r1a, r1b, r2c, r2d, the equivalent resistance is 25ohms.

About the damping, I'm not sure to understand what R11 or R13 means, is it only about thickness ?
(We don't use this kind of references here in Belgium)
Is 4 inch thick ok ? what about 6 inch ?

Thanks And Merry Christmas.

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Re: 4 Pi plan [message #81824 is a reply to message #81821]

Thu, 24 December 2015 10:15

Wayne Parham
Messages: 18793
Registered: January 2001

Illuminati (33rd Degree)

Resistors R1 and R2 should be 16Ω and 25Ω, respectively. The series/parallel arrangement was just done to increase thermal capacity. Using four 10 watt parts we can dissipate 40 watts in each branch safely. See pages 69 and 71 of the Speaker Crossover analysis document to see the power dissipation curve for each of those parts.

The damping material should be cut from a fiberglass sheet that's approximately 2" - 3" thick. I think sheets that are 4" thick would be great too. Just compress them a little bit when you're installing them.

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