| Mono "flanking sub" [message #81624] |
Sat, 24 October 2015 05:50  |
jonone
Messages: 67
Registered: October 2015
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Viscount |
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Hi,
I'm using avi adm10 active monitors as mains, they are on wall brackets so very close to the wall, they have a summed mono subwoofer out which is a full range summed signal of the left and right channel, this is what I'm sending to my single "flanking sub" which is a down firing a acoustic elegance td15h+ Apollo in a 17.5" cube with its on plate amp, it's a very clean driver.
I have an Av amp which at the moment is set to "fronts large "and sending the mains the l/r signal, the flanking sub gets a summed version of this.
I'm waiting on ae to make my sub driver which will be a single Av15h with its own plate amp, I'm planing on running this nearfield with maybe a 60hz crossover, so in the end the av amp will send 60hz hp to the mains+ flanking sub and the 60hz lp to the nearfield sub for lfe etc.
I'm going to use a mini dsp for gain/ delay and eq, and also the crossover for "flanking sub " but at the moment I'm just using the 200hz roll off on the plate amp with good effect, the minidsp has bw / Lr and Bessel crossovers ,is bessel the one to use?
I'm using rew and and a umik mic to set this up with the mini dsp but it's all new/ a big learning curve, so your have to bare with me!
I know this is not a true flanking sub method! but a summed mono "midbass" driver covering -up to 200hz, seems to work from initial listening, I.e the stereo image inst obviously effected to my ears, and according to rew it's helped pull out some dips compared to the speakers on there own.
I can't really afford more drivers due to cost and space and divorce! 
What are people thoughts on what I'm doing?
Thanks,
Jon
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| Re: Mono "flanking sub" [message #81632 is a reply to message #81624] |
Tue, 27 October 2015 18:14  |
johnnycamp5
Messages: 354
Registered: June 2015
Location: NJ
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Grand Master |
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I am currently running a pair of 4pi's on my front wall.
Until I get the system in my basement, I have been using a single sub.
Initially, I had the sub located outside of either the left or right speaker, with my dac and amp centered.
With this configuration, I could hear/feel the somewhat lopsided bass response towards one side of the room (left or right), as Wayne has described.
I then centered the sub, (swapped it with the dac and amp) and the lopsided bass response went away.
Overall, bass response in my room sounds/measures relatively flat.
But I must say, I believe some of this improvement is a result of exstensive (compared to most) room treatments, not just to the centering of the sub.
In fact, before the room treatments in this room, I had a complete 70 hZ "null" (inaudible frequency), dead center in the room!
YMMV.
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| Re: Mono "flanking sub" [message #81635 is a reply to message #81624] |
Thu, 29 October 2015 11:24 |
johnnycamp5
Messages: 354
Registered: June 2015
Location: NJ
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Grand Master |
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I use a plate amp that is attached to the sub itself.
I tend to prefer it set at 50hZ, which many find too low.
I believe the crossover (low pass 50 to 100hZ)slope is 12db.
I use no eq.
I come from a mindset/point of view where, you try to fix the room first (acoustical treatments in the form of broadband absorbers, bass/corner traps, Helmholtz absorners) instead of just throwing in multiple subs for correction.
Of course this can be quite tedious, and many view extensive room treatments as "killing ants with a hammer", since you can simply use multiple subs for correction, but I am set in my ways.
Things were not bad at all with the sub in the corner after the room treatments.
I centered it to make bass response in the room as even as possible throughout. In my opinion, there is no denying multiple subs work best, even in heavily treated rooms, but I simply do not have that option in my current listening room.
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