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Where are the Maggies and SVS's placed in the room? And where is the primary listening position? What is/are your listening complaint(s)? Have you tried any (effective) absorption treatments? Your room is very long, would expect it to behave more like a tunnel than a room (similar to the vastly under appreciated issue in most floor standing box loudspeakers).
You can predict or you can just measure. Nowadays it's easy to download an FFT app on your phone, play some full range pink noise through your speakers and simply walk around the room with your phone. It'll tell you exactly where there are issues with your room and give you a better idea of where the ideal locations are for your speakers and subs. Are your subs placed in the front corners behind your speakers? If so then that's a problem (usually). If you want to stick with box subs, then you should buy 2 more subs and place one along a side wall and one along the back wall (not in corners). That will give you a nice 'swarm' approach that will even out your room nodes.The other option is to sell the SVS subs and get a pair of Servo OB subs to replace them. That's the approach I would recommend. You still get a pair of them and you place them as close to the main speakers as possible (NOT in corners). Because they are OB, they have 2 advantages over box subs. First, they don't excite room modes in the same way that box speakers do, so you have much faster and more detailed bass. Second, because they are OB, they match the radiation pattern of your main speakers, making integration with them MUCH easier and more seamless.
The GR Research are the ones I'm referring too. And yes, they hit very hard and they go very low. In some ways, they hit even harder than the SVS subs. Here's the physics of it - your main speakers are radiating sound in a figure 8 pattern because they are OB. But your SVS subs are radiating sound like a pulsing sphere. So your bass will never match up very well to your speakers, not matter how good the subs. Box subs will always produce bass that sounds slow and bloated when trying to pair with OB main speakers. On the other hand, OB subs match up perfectly because they radiate sound in a figure 8 pattern too. Plus, they don't excite room modes nearly as much (particulalry the side to side room modes) so you naturally end up with less boomy and cleaner bass.But, how hard do they hit? OK, I have a confession to make. I'm a bit of a bass head. I know that might lose me some audiophile cred, but there it is. To me, bass is the foundation of all music and I'm simply not interested in a speaker or system that can do bass really, really well. I had heard OB bass before GR Research came out with their Servo OB solution. And I'm sorry but most OB bass systems suck. They are nicely detailed and clean but they are seriously lacking in impact and punch. So when I first heard the GR Research Servo OB subs I was stunned because those things freaking punch you in the chest. They are monsters in that respect. And they go deep (20 hz in my room, flat). And they still have all the traditional strengths of OB bass (clean, detailed, fast). These things have literally no weaknesses. And for a bass-snob like me, that's incredibly impressive.
I don't know what you mean by "For example, considering the width of my room if I was trying to clean up the null between the 2nd and 3rd axial standing wave, would I want to place my speaker between the 2nd and 3rd (red and black) or avoid that area?" I wonder if you're not thinking about it correctly.The sidewalls result in standing wave (mode) formation. The first-order width mode is 41 Hz, so if a sound source "drives" this mode (maximally so if if the source is at a sidewall), then a listener positioned in the midline of the room will experience a null or relative suckout at this frequency. However, if the sound source is placed in the midline of the room, then it will not energize this mode. Alternatively, instead of moving the sound source, if a second sound source is placed on the opposite sidewall, then it will cancel out this mode. The tops of the curves are the antinodes, so sound sources placed at these locations will energize the modes, unless they're cancelled, and listeners placed at these locations will experience the maximal boost, so to speak, of the mode. The bottom "rebound"-looking parts are the nodes, so listeners at these locations will experience the most null or suckout, and sound sources at these locations will not activate the mode.The second-order width mode is 83 Hz. A listener placed in the midline of the room will experience a peak at this frequency if the mode is driven. Unless the listener moves to the side of the midline, they will not experience a null, but they certainly would if they moved 3.375 feet to the side. Are you trying to "clean up" this null at such locations? If so, move the sound sources (I don't know where you have your crossover set) for this frequency so that they're approximately 1/4 of the way from the side walls. This would reduce variation of the frequency response curve at this frequency for listening positions both at and lateral of midline.Etc for the third-order width mode, but if you're using dipole planar speakers, they tend to radiate much less sound to the sides, so they're probably not energizing this mode as much as a conventional speaker would, so you may not need to be concerned, anyway.
Yes, I believe I was thinking of things a bit wrong. Your comment "Alternatively, instead of moving the sound source, if a second sound source is placed on the opposite sidewall, then it will cancel out this mode." This is what I was trying to understand. I was not sure to place speakers on a certain node point in the room or not, but I guess that all depends if I'm getting a null or not. Not sure if I explained my understanding of that correctly, but I believe it makes sense in my mind.
And this is very informative... "Unless the listener moves to the side of the midline, they will not experience a null, but they certainly would if they moved 3.375 feet to the side. Are you trying to "clean up" this null at such locations? If so, move the sound sources (I don't know where you have your crossover set) for this frequency so that they're approximately 1/4 of the way from the side walls. This would reduce variation of the frequency response curve at this frequency for listening positions both at and lateral of midline." Thank you for your help!
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