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Re: Mono "flanking sub" [message #81663 is a reply to message #81659] |
Tue, 10 November 2015 14:06 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
jonone
Messages: 67 Registered: October 2015
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Viscount |
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I've dialled in the flanking sub for now as I'm waiting for my sub driver from ae, I was then going to use that nearfield as I'm only using one so I should get the most tactile output.
I was going to run that from the lfe channel with a 60hz crossover so it's not localisable this also means the mains are being relieved of some bass but the flanking sub get high passed at 60hz too, so maybe I should run them full range as I will get better smoothing by having all three overlapping fully? The down side is I may loose some content from the lfe channel, ( did you get to the bottom of that) and I beleive there will be some intermod distortion from the mains although the manufacture has told me only a 100hz and above crossover helps with that.
I have a mountain of a room mode at 40hz, ( you can just see it peaking out in my graphs) the flanking sub helps reduce it, I was thinking the crossover at 60hz will also reduce it as the mains and flanking sub are rolling of, but maybe not high passing the mains/flanking sub and just over lapping the nearfield at circa 60hz will actually help depending on how it sums?
Do you think I can improve the 200hz region or are flanking subs done at 150hz?
Lastly, my nearfield sub will have a sweepable phase knob 0-180, does this effectively do the same thing as delay? Or do I get it as flat as I can with that then try and adjust the delay afterwards?
Thanks again for your help, I appreciate it!
Jon
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Re: Mono "flanking sub" [message #81664 is a reply to message #81663] |
Tue, 10 November 2015 14:43 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18752 Registered: January 2001
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Illuminati (33rd Degree) |
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I would definitely blend as many sources as possible in the modal region, below 200Hz. Above 200Hz, the sound field is already complex, which is why it is called the statistical region. It is already blended by dense interference from all the mutitude of reflections in the room.
There is a transition region where the sound field is neither densely spaced tiny ripples, nor is it consist of large modes. It's somewhere in between, where the modes are becoming closer together but still apparent, at least in measurements. That is a region that's arguably harder to deal with. One can smooth the transition region with an array of midrange drivers. Even a truncated array can be used to good effect. So if you want to put a helper midwoofer very close to the mains and crossover above 200Hz, that can help smooth that region. It's the same approach as a flanking subwoofer, but closer, perhaps mounted on the same baffle like a 2.5-way loudspeaker.
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