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Re: 4pi Commercial Dinner Theater Build [message #68701 is a reply to message #68700]

Sun, 24 July 2011 11:02

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

Wayne...

I just read your paper on Hi-Fi Uniform Directivity Loudspeakers. Facinating. I am not sure what is more scary, the fact that I understood 95% of it, or that I found it facinating. Wink

It is good to know that you guys really know your stuff, and we are privileged that you have chosen to share your designs and thoughts with us. Moreover, your availability to answer our questions is not the norm in any industry, and is greatly appreciated.

The gaps in my knowledge on sound wave theory stem around the difference between the different "spaces" (1/4 space, 1/2 space, etc.) I am sure I will read about them in more depth when I can find the time, but in the mean time,; your input and help is invaluable. I look forward to throwing money your way when the time comes to buy the drivers and components for our cinema project. Lord knows I am saving a ton of money through your generosity.

More on the stage speakers: More forum research leads me to believe that the 3pi may work just as well as the 4pi for a live music application. Based on pictures that I have seen, I think the 3pi is more "sexy" than the 4pi, and wanted to get your opinion on the difference of the two for live music.

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Re: 4pi Commercial Dinner Theater Build [message #68703 is a reply to message #68701]

Sun, 24 July 2011 12:14

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

I'd say they're both equally competent. Both have similar characteristics, tonal balance, directivity, etc. The four π speaker is slightly more efficient because of the larger midwoofer.

Really, you should make your choice based on the midwoofer family you prefer. If you want AE, go with the three π. If you want JBL, go with the four π instead. Of if you plan on using the Eminence drivers, the four π has the cast-frame Omega 15, whereas the three π has the stamped frame Delta 12LF.

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Re: 4pi Commercial Dinner Theater Build [message #68721 is a reply to message #68703]

Mon, 25 July 2011 20:59

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

Can I have plans for the 3pi?

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Re: 3pi Commercial Dinner Theater Build [message #68730 is a reply to message #68721]

Mon, 25 July 2011 22:39

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

You've got mail!

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Re: 3pi Commercial Dinner Theater Build [message #68742 is a reply to message #68730]

Tue, 26 July 2011 20:03

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

It seems strange to this novice that the 3pi is actually quite a bit bigger than the 4pi. huh.

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Re: 4pi Commercial Dinner Theater Build [message #69120 is a reply to message #68600]

Mon, 22 August 2011 11:12

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

I just thought I would give an update on our progress. Click Here to see the build thread in our facebook album. Smile

I know that Wayne has said 3/4" BB is okay for the 1pi that calls for 5/8" as long as the interior dimensions remain unchanged. I do wonder though; will there be any difference in the performance having used a thicker wood?

Also, I notice that the 3/4" BB is actually 11/16", which is only 1/16" thicker than a true 5/8" (for a total of 1/8" when considering both sides). Does that 1/8 really make that much difference? I only ask because I have two panels that I set aside that I accidentally cut too narrow by 1/32, which means the interior space would be 1/16 less than what the instructions call for if I use these panels. Would that 1/16" really make any difference if I use those panels?

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Re: 4pi Commercial Dinner Theater Build [message #69123 is a reply to message #69120]

Mon, 22 August 2011 12:42

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

Baltic Birch is metric, so you can get 18mm (0.71") or 19mm (0.75"). Both are common, and either is fine for this application. But if you want true 3/4" (like for panels intended to fit into 3/4" dado slots), then you have to use the 19mm stock.

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Re: 4pi Commercial Dinner Theater Build [message #69124 is a reply to message #69123]

Mon, 22 August 2011 14:18

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

That is good to know. I will look more closely at that tonight when I go to buy another sheet for some more 1pi enclosures. Are you able to say if there is any difference in performance using a heavier stock of wood?

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Re: 4pi Commercial Dinner Theater Build [message #69125 is a reply to message #69124]

Mon, 22 August 2011 14:33

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

No difference at all. That's what I meant when I said "either is fine for this application." It can matter in other cabinets, (like the 12π hornsub, for example), but not in this one.

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Re: 4pi Commercial Dinner Theater Build [message #69126 is a reply to message #68600]

Mon, 22 August 2011 14:48

dutchswan0311
Messages: 102
Registered: June 2011
Location: Iowa

Viscount

I am trying to figure out exactly what I want to do for our stage sound. I am thinking about stacking a 4pi built with an extra layer of ply on each side to make it the same width as the F20 (60"H,20"W,30"D), and then just stack it on the F20. Would it be okay to (1) flip the F20 over with the horn on top and then (2) stack a 4pi on top of the F20 flush to the front? The reasoning behind this would be to then build 1 cloth mesh grill to cover all of the drivers of the sub and 4pi (well, the drivers of the 4pi and the horn of the sub).

I suppose my question might really be as to whether or not the horn would be too close to the other drivers and if there is any loss of room gain by not having the horn next to the floor.

Thoughts?

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