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Re: 4 Pi Design Questions [message #73709 is a reply to message #61737]

Fri, 31 August 2012 15:13

mantha3
Messages: 72
Registered: May 2012
Location: Lino Lakes, MN

Viscount

Wayne,

I'm planning to build some 4 PI "Tall" speakers like Nichol1997 did here in this thread. Basically, I'd build exactly like your plan but add 7" in height to the cabinet as Nick did. I'd center the horn but have it spaced exactly the same distance from the woofer as you have outlined in the plan.

I'm planning to use a lower brace where the bottom panel would be on your normal 4PI. I'd basically stuff the entire cabinet below this lower brace with the damping material you outline in the plan. I'd stuff around the ports and behind the port like you advise on the normal 4 PI

Here is the face of the speaker I drew up. I'd use 4" Internal Dia ports that are flared to 7" on the face. The 4" run of the Port would be 9.25" in length. This is what Nick said he did with his build.

I'm a little worried on the Port part.

You run an internal size of 3.5" X 6" for an Area of 21.5"
Two ports at 4" would be a lager area. 1 port at 4" would be pi × r2 at 12.5" so two would be 25" of area

I think if I used two of the 4" ports I'd need to run them at least the 10" you run your 3.5" X 6" rectangle ports or more given the extra area.. Or is this somewhat larger port area not such a big deal.. Or if it was we would see something in the test Nick did? I was hoping that this test Nick did shows this port idea of Nick at two 4" ports at 9.25" is good to go.

Sorry for all the questions.. Maybe I'm over-thinking this all

PS I have an plunging head router and the round ports would be easier for me... I like the look of the round ports too... And the 7" extra height is cool as the speaker will look a bit more like a tower and not need a stand perhaps.

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[Message index]

		4 Pi Design Questions By: Nichol1997 on Sun, 17 January 2010 22:09
		Re: 4 Pi Design Questions By: Nichol1997 on Mon, 18 January 2010 06:36
		Re: 4 Pi Design Questions By: Wayne Parham on Mon, 18 January 2010 08:46
		Re: 4 Pi Design Questions By: Nichol1997 on Wed, 20 January 2010 20:59
		Re: 4 Pi Design Questions By: Wayne Parham on Wed, 20 January 2010 21:09
		Re: 4 Pi Design Questions By: Nichol1997 on Thu, 01 April 2010 21:15
		Re: 4 Pi Design Questions By: Wayne Parham on Fri, 02 April 2010 09:25
		Re: 4 Pi Design Questions By: Nichol1997 on Fri, 02 April 2010 20:58
		Re: 4 Pi Design Questions By: Wayne Parham on Sat, 03 April 2010 09:32
		Re: 4 Pi Design Questions By: Nichol1997 on Wed, 07 April 2010 21:17
		Re: 4 Pi Design Questions By: Wayne Parham on Wed, 07 April 2010 21:55
		Re: 4 Pi Design Questions By: Nichol1997 on Sun, 20 June 2010 08:18
		Re: 4 Pi Design Questions By: Wayne Parham on Sun, 20 June 2010 08:54
		Re: 4 Pi Design Questions By: Nichol1997 on Thu, 11 November 2010 21:11
		Re: 4 Pi Design Questions By: Wayne Parham on Fri, 12 November 2010 07:52
		Re: 4 Pi Design Questions By: Psychoacoustic on Thu, 11 November 2010 22:06
		Re: 4 Pi Design Questions By: Doc Jr 8156 on Fri, 12 November 2010 09:41
		Re: 4 Pi Design Questions By: Wayne Parham on Fri, 12 November 2010 14:44
		Re: 4 Pi Design Questions By: Nichol1997 on Thu, 17 May 2012 19:38
		Re: 4 Pi Design Questions By: Wayne Parham on Thu, 17 May 2012 22:46
		Re: 4 Pi Design Questions By: Nichol1997 on Fri, 01 June 2012 19:30
		Re: 4 Pi Design Questions By: Wayne Parham on Fri, 01 June 2012 21:35
		Re: 4 Pi Design Questions By: mantha3 on Sat, 02 June 2012 08:56
		Re: 4 Pi Design Questions By: Wayne Parham on Sat, 02 June 2012 10:30
		Re: 4 Pi Design Questions By: Nichol1997 on Mon, 18 June 2012 19:50
		Re: 4 Pi Design Questions By: Wayne Parham on Mon, 18 June 2012 21:12
		Re: 4 Pi Design Questions By: mantha3 on Tue, 19 June 2012 07:52
		Re: 4 Pi Design Questions By: Wayne Parham on Tue, 19 June 2012 07:55
		Re: 4 Pi Design Questions By: Nichol1997 on Tue, 19 June 2012 19:08
		Re: 4 Pi Design Questions By: Wayne Parham on Tue, 19 June 2012 21:34
		Re: 4 Pi Design Questions By: Nichol1997 on Sun, 24 June 2012 20:04
		Re: 4 Pi Design Questions By: Nichol1997 on Sun, 24 June 2012 20:08
		Re: 4 Pi Design Questions By: Wayne Parham on Mon, 25 June 2012 07:48
		Re: 4 Pi Design Questions By: mantha3 on Mon, 25 June 2012 17:15
		Re: 4 Pi Design Questions By: Wayne Parham on Mon, 25 June 2012 18:12
		Re: 4 Pi Design Questions By: mantha3 on Fri, 31 August 2012 15:13
		Cabinet design, port placement and internal standing waves By: Wayne Parham on Fri, 31 August 2012 18:28
		Re: 4 Pi Design Questions By: mantha3 on Fri, 31 August 2012 18:39
		Re: 4 Pi Design Questions By: Wayne Parham on Fri, 31 August 2012 18:51
		Re: Cabinet design, port placement and internal standing waves By: dheflin44 on Wed, 27 February 2013 15:16
		Re: Cabinet design, port placement and internal standing waves By: Wayne Parham on Wed, 27 February 2013 15:50
		Re: Cabinet design, port placement and internal standing waves By: dheflin44 on Wed, 27 February 2013 17:06
		Re: Cabinet design, port placement and internal standing waves By: Wayne Parham on Wed, 27 February 2013 17:25

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