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1 Forum: Pi Speakers «» Posted on: Sun, 20 January 2013 13:41 «» By: zheka
Re: 4 PI by Andy
Thank you very much. The box I am working on is also 10ft^3. The longest side is about 36" internal. It would not be used as true flanking sub but it may be low passed as high as 120Hz. If standing waves indeed form in this case, they would come ...
2 Forum: Pi Speakers «» Posted on: Sun, 20 January 2013 13:01 «» By: Wayne Parham
Re: 4 PI by Andy
Damping material is not needed in traditional subs run outdoors, distributed subs in a multisub arrangement, or pretty much any subwoofer that is acoustically small. But that's a key: The subwoofer cabinet must be acoustically small, which means the lo...
3 Forum: Pi Speakers «» Posted on: Fri, 18 January 2013 16:59 «» By: Wayne Parham
Re: Subwoofers vs budget... where do you draw the line?
The multisub approach is intended to mitigate room modes. The problem is the direct sound from the subwoofer and the reflections from each boundary combine differently at each point in the room. So there are hot spots and dead spot in the room, and the...
4 Forum: Pi Speakers «» Posted on: Mon, 14 January 2013 17:11 «» By: Wayne Parham
Re: Subwoofers vs budget... where do you draw the line?
If I have DI-matched two-way speakers, I always start with flanking subs. I mean, you can run the speakers with no subs at all if you're making an apartment system or something like that, but if we're talking stepping up a notch or two, start with flank...
5 Forum: Pi Speakers «» Posted on: Fri, 28 December 2012 15:31 «» By: zheka
Re: Flanking Subs vs Helper Woofers
Can you explain what the decorrelation filters are, how they work, how effective can they be in multisub and what kind of processors are used to make them? Thank you very much.
6 Forum: Pi Speakers «» Posted on: Fri, 28 December 2012 13:02 «» By: Wayne Parham
Re: Flanking Subs vs Helper Woofers
Flanking subs and distributed multisubs are different animals. They have a similar purpose and correspondingly similar execution but have some specific differences because of the frequency ranges where they are intended to be most effective. Flanking s...
7 Forum: Pi Speakers «» Posted on: Thu, 27 December 2012 19:14 «» By: Wayne Parham
Re: 3pi, smaller cab possible?
Changing the size of the baffle will alter the speaker's directivity at low to midrange frequencies. At low frequencies, the speaker radiates omnidirectionally but as frequency rises, the baffle begins to limit the radiation pattern to the forward-facin...
8 Forum: Pi Speakers «» Posted on: Sat, 22 December 2012 09:46 «» By: Wayne Parham
Re: 4PI Cabinet plans / question
That's one of the main reasons I prefer vented boxes. They reduce excursion while at the same time adding extension. And in the modal region, the changing phase of a Helmholtz resonator is unimportant, so it's definitely better to run vented mains. ...
9 Forum: Room Acoustics «» Posted on: Tue, 18 December 2012 09:33 «» By: Wayne Parham
Re: speaker location and type
Speaker placement depends largely on the type of speaker you choose. Some need to be in free space, not near walls. Others work better when placed close to walls. Some are designed to be placed in corners. Some should be pointed at the listening area...
10 Forum: Speaker «» Posted on: Wed, 12 December 2012 15:18 «» By: Wayne Parham
Re: Room modes, multisubs and flanking subs
Specific multisub placement advice: Welti configuration Geddes configuration Parham "flanking sub" configuration
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