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Re: 4 Pi Design Questions [message #64658 is a reply to message #64651]

Fri, 12 November 2010 14:44

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

If you're using the TD12S woofer (used only in the three π loudspeaker), you don't need R3 but on all other models, you do. If you omit this resistor on any of the models that call for it, you'll have a pretty nasty peak in the upper midrange, near the crossover frequency. This is true for all versions of the four π loudspeaker.

You can derate any component, provided power input is reduced accordingly. That said, I would not suggest derating any of them because it never hurts to keep things cool.

See the Speaker Crossover document for more information. An example of the peak you'll get if you remove R3 is shown on page 43 and the power transfer curve for this component is shown on page 66.

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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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