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pro four Pi plans please [message #46901]

Mon, 16 May 2005 04:08

andreas paulsen
Messages: 50
Registered: May 2009

Baron

Hi Wayne

Could you send me the four Pi plans please ?

Cheers
andreas

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You've got mail! [message #46902 is a reply to message #46901]

Mon, 16 May 2005 05:58

Wayne Parham
Messages: 18789
Registered: January 2001

Illuminati (33rd Degree)

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Re: You've got mail! [message #46905 is a reply to message #46902]

Mon, 16 May 2005 12:22

andreas paulsen
Messages: 50
Registered: May 2009

Baron

Thanks

The box dimensions you're giving, does that include the loss of bracing the cabinet with a resonable amount of 1x2" lumber?

What is the total volume displaced by the tweeter horn ? - I plan to use my philips ribbons instead (with active crossover) as I have the parts already. Might just use the liberated space for extra bracing.

Cheers
Andreas

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Calculating displacement volume with a composite of primitive shapes [message #46910 is a reply to message #46905]

Mon, 16 May 2005 19:03

Wayne Parham
Messages: 18789
Registered: January 2001

Illuminati (33rd Degree)

Check out the program called volume.exe in the PiAlign distribution file. I don't recall the volume of the tweeter and horn, but you can easily get a good estimate by calculating it as a composite of primitive shapes. For example, a compression driver or speaker magnet can be calculated as a cylinder, a speaker cone as a cone and a horn as a wedge or pyramid.

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Re: Calculating displacement volume with a composite of primitive shapes [message #46915 is a reply to message #46910]

Tue, 17 May 2005 01:48

andreas paulsen
Messages: 50
Registered: May 2009

Baron

OK - I'll just do it by hand with my trusting old HP calculator - I'll check out volume.exe though.

How much bracing is allready calculated into the volume of the box?

Cheers
andreas

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braces [message #46916 is a reply to message #46915]

Tue, 17 May 2005 02:33

andreas paulsen
Messages: 50
Registered: May 2009

Baron

Well - after reading a massive amount of old threads It seems that pro-four Pi's are constructed without braces as the cabinet is small and filled with stuff:). I might brace it anyway.

Cheers
Aandreas

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removable baffle [message #46929 is a reply to message #46916]

Thu, 19 May 2005 13:59

andreas paulsen
Messages: 50
Registered: May 2009

Baron

Do you suggest making the baffle removable, to be able to tune the port Or should I just biscuit and glue it all together and count on the tuning to be on spot?.
Any benefits of making the baffle 1.5" thick ? I might just do it anyway to be able to flush mount the woofer.

Take care
andreas

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Re: removable baffle [message #46931 is a reply to message #46929]

Thu, 19 May 2005 14:35

Wayne Parham
Messages: 18789
Registered: January 2001

Illuminati (33rd Degree)

I like to avoid removable baffles where possible. They're difficult to brace, and even where bracing isn't required, they tend to reduce strength as compared with a permanently fixed panel.

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building [message #46961 is a reply to message #46931]

Thu, 26 May 2005 08:33

andreas paulsen
Messages: 50
Registered: May 2009

Baron

Hi all

The quasi pro fours are comming along nicely - made in 3/4 mdf and biscuit jointed. Bracing by a liberal amount of 1x2 and 2x4 pine lumber i found littered on the street in addition to a window brace above the woofer cutout. second cabinet is in glueup while bracing the first. Need to cut and route the baffles and glue them on.

Cheers
andreas
--

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