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Re: 4PI Plans Request [message #91290 is a reply to message #91289]

Mon, 30 December 2019 11:11

Wayne Parham
Messages: 18789
Registered: January 2001

Illuminati (33rd Degree)

You've got mail!

We all love to see build threads. So please create one and post often!

As for the mods you are considering, I am glad you understand the potential for anomalies from standing wave modes in large full-range cabinets. That knowledge will push you towards diligence in this regard.

For crossover information, please see the following thread:

Crossover optimization for DI-matched two-way speakers

Watch the video in that thread too, because it shows you how to find the position of the vertical nulls. The forward lobe is between the nulls.

I also encourage you to look at the concept of flanking subs. They work hand-in-hand with the three Pi and four Pi cabinets, meaning that they increase bass extension and conjugate lower rolloff both from cabinet alignment and from baffle step. In addition, each flanking sub mitigates SBIR from nearest boundaries and it smoothes higher frequency room modes.

By making the cabinets larger, you not only change the position and frequency of internal standing wave modes but you also change the bass alignment and possibly the frequency where baffle step occurs. This might change the overall synergy between the mains and their flanking subs.

So keep these things in mind as you incorporate your changes.

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[Message index]

		4PI Plans Request By: Ziggin on Sat, 23 May 2015 03:51
		Re: 4PI Plans Request By: Wayne Parham on Sat, 23 May 2015 06:56
		Re: 4PI Plans Request By: Ziggin on Sat, 23 May 2015 11:58
		Re: 4PI Plans Request By: Wayne Parham on Mon, 25 May 2015 09:15
		Re: 4PI Plans Request By: Rustydog on Wed, 15 November 2017 00:40
		Re: 4PI Plans Request By: Wayne Parham on Thu, 16 November 2017 08:32
		Re: 4PI Plans Request By: Chas1980 on Wed, 20 December 2017 16:08
		Re: 4PI Plans Request By: Wayne Parham on Thu, 21 December 2017 08:36
		Re: 4PI Plans Request By: acamilicko on Mon, 25 December 2017 11:00
		Re: 4PI Plans Request By: Wayne Parham on Mon, 25 December 2017 12:33
		Re: 4PI Plans Request By: booangler on Sat, 06 January 2018 12:11
		Re: 4PI Plans Request By: Wayne Parham on Sat, 06 January 2018 13:22
		Re: 4PI Plans Request By: Quaker on Sat, 28 April 2018 17:25
		Re: 4PI Plans Request By: Wayne Parham on Sun, 29 April 2018 09:24
		Re: 4PI Plans Request By: Casmick on Mon, 30 April 2018 08:42
		Re: 4PI Plans Request By: Wayne Parham on Mon, 30 April 2018 10:24
		Re: 4PI Plans Request By: MH Lumber on Tue, 08 May 2018 17:02
		Re: 4PI Plans Request By: Wayne Parham on Tue, 08 May 2018 17:36
		Re: 4PI Plans Request By: MH Lumber on Fri, 18 May 2018 09:27
		Re: 4PI Plans Request By: Wayne Parham on Fri, 18 May 2018 10:17
		Re: 4PI Plans Request By: jeffx on Sun, 01 July 2018 07:47
		Re: 4PI Plans Request By: Wayne Parham on Sun, 01 July 2018 11:21
		Re: 4PI Plans Request By: grimberg on Fri, 10 August 2018 16:35
		Re: 4PI Plans Request By: Wayne Parham on Sat, 11 August 2018 09:23
		Re: 4PI Plans Request By: mikeincalgary on Wed, 19 September 2018 18:05
		Re: 4PI Plans Request By: Wayne Parham on Thu, 20 September 2018 09:13
		Re: 4PI Plans Request By: DavidM on Sat, 17 November 2018 07:35
		Re: 4PI Plans Request By: Wayne Parham on Sat, 17 November 2018 09:09
		Re: 4PI Plans Request By: kdlsrinu on Fri, 21 December 2018 22:34
		Re: 4PI Plans Request By: Wayne Parham on Sat, 22 December 2018 10:16
		Re: 4PI Plans Request By: tomkristian on Thu, 17 January 2019 14:44
		Re: 4PI Plans Request By: Wayne Parham on Thu, 17 January 2019 15:22
		Re: 4PI Plans Request By: Damkel on Tue, 19 February 2019 13:32
		Re: 4PI Plans Request By: Wayne Parham on Tue, 19 February 2019 16:00
		Re: 4PI Plans Request By: jheredia on Sat, 30 March 2019 20:53
		Re: 4PI Plans Request By: Wayne Parham on Sun, 31 March 2019 10:59
		Re: 4PI Plans Request By: Luithien1 on Sat, 06 April 2019 17:28
		Re: 4PI Plans Request By: Wayne Parham on Sat, 06 April 2019 19:09
		Re: 4PI Plans Request By: Luithien1 on Sun, 07 April 2019 09:09
		Re: 4PI Plans Request By: Wayne Parham on Sun, 07 April 2019 10:36
		Re: 4PI Plans Request By: jtwrace on Tue, 16 April 2019 08:44
		Re: 4PI Plans Request By: Wayne Parham on Tue, 16 April 2019 09:58
		Re: 4PI Plans Request By: Chris8h on Sun, 02 June 2019 15:01
		Re: 4PI Plans Request By: Wayne Parham on Mon, 03 June 2019 09:41
		Re: 4PI Plans Request By: daemonix on Tue, 11 June 2019 12:24
		Re: 4PI Plans Request By: Wayne Parham on Tue, 11 June 2019 14:31
		Re: 4PI Plans Request By: dkalsi on Mon, 01 July 2019 09:12
		Re: 4PI Plans Request By: Wayne Parham on Mon, 01 July 2019 10:40
		Re: 4PI Plans Request By: bigyank on Mon, 01 July 2019 14:26
		Re: 4PI Plans Request By: Wayne Parham on Mon, 01 July 2019 19:53
		Re: 4PI Plans Request By: malyh on Wed, 25 September 2019 04:38
		Re: 4PI Plans Request By: Wayne Parham on Wed, 25 September 2019 08:38
		Re: 4PI Plans Request By: malyh on Thu, 26 September 2019 02:30
		Re: 4PI Plans Request By: Wayne Parham on Thu, 26 September 2019 10:18
		Re: 4PI Plans Request By: bigyank on Thu, 26 September 2019 10:37
		Re: 4PI Plans Request By: Wayne Parham on Thu, 26 September 2019 11:10
		Re: 4PI Plans Request By: Esj on Sun, 01 December 2019 12:20
		Re: 4PI Plans Request By: Wayne Parham on Sun, 01 December 2019 12:50
		Re: 4PI Plans Request By: mathiasb on Mon, 09 December 2019 08:34
		Re: 4PI Plans Request By: Barryso on Mon, 09 December 2019 09:13
		Re: 4PI Plans Request By: mathiasb on Mon, 09 December 2019 09:42
		Re: 4PI Plans Request By: Wayne Parham on Mon, 09 December 2019 10:47
		Re: 4PI Plans Request By: mathiasb on Mon, 09 December 2019 11:40
		Re: 4PI Plans Request By: Wayne Parham on Mon, 09 December 2019 12:25
		Re: 4PI Plans Request By: mathiasb on Mon, 09 December 2019 14:59
		Re: 4PI Plans Request By: Wayne Parham on Mon, 09 December 2019 16:45
		Re: 4PI Plans Request By: mathiasb on Sun, 15 December 2019 22:12
		Re: 4PI Plans Request By: Wayne Parham on Mon, 16 December 2019 09:48
		Re: 4PI Plans Request By: mathiasb on Mon, 16 December 2019 10:07
		Re: 4PI Plans Request By: Sion on Fri, 13 December 2019 20:37
		Re: 4PI Plans Request By: Wayne Parham on Sat, 14 December 2019 09:53
		Re: 4PI Plans Request By: Valentino Beach on Sun, 15 December 2019 21:12
		Re: 4PI Plans Request By: Wayne Parham on Mon, 16 December 2019 09:51
		Re: 4PI Plans Request By: Damkel on Fri, 27 December 2019 13:47
		Re: 4PI Plans Request By: Wayne Parham on Fri, 27 December 2019 17:32
		Re: 4PI Plans Request By: Birdman on Sun, 29 December 2019 22:43
		Re: 4PI Plans Request By: Wayne Parham on Mon, 30 December 2019 11:11
		Re: 4PI Plans Request By: brad n on Thu, 16 January 2020 19:49
		Re: 4PI Plans Request By: Wayne Parham on Fri, 17 January 2020 10:24

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