@TheWarrior
“To assume you can look at a measurement and understand why it measured that way is a terrible mistake.”
Define “terrible mistake.” Below the transition frequency of the room, the room controls bass response. There are varieties of tools which allow one to properly correct them. This list is fairly comprehensive in detailing them.
How is this list comprehensive? It says measure and correct with DSP in entirely too many words. There is no mention of the realities of bass reproduction in small rooms. To ignore that is to limit your performance.
“Flat, is never the goal, only accurate. There have been far too many posts on this forum about applying DSP filters to achieve a visual effect in a measurement (flat) without taking any time to understand why the system measures in such a way.”
Where does it say in this link that “just flat” was the end goal? While flat response is indeed accurate, preference can be anything. Steps 9-16 reflect this.
Flattening the response is your number one recommendation. The massive rumbling of your subs at low frequency should be telling you that solution is incorrect. But you don't seem to stick with any one setup. Your fronts move every time I come over. I gave you a detailed list of your room modes and recommended filters from the other side of the country, while on vacation. You never showed me how they performed, I believe you ignored it and used REW instead. Totally cool, but unless I missed something, you dismissed my suggestion without trying it. And are now criticizing it.
“I ONLY recommend applying filters based on room mode measurements.”
I ONLY disagree! I found that I have to go past simply knowing room modes and ONLY filtering them to get the response which I prefer. You do it your way, but this is what worked for me, so I pass it on. If you did it this way and it didn’t work for you, that’s also fine. But, do you have a concise detailed list which DID work for you? Please share!
You disagree that I only recommend applying filters based on room mode measurements? No I am not brief, but I am certainly comprehensive. Who else is making room mode predictions that are proven in measurements? It's incredibly easy to do! Speed of sound divided by dimension. Knowing which boundary is interfering, and how that relates to the LP is absolutely essential. And I think that's the part you're missing. The influence a resonant frequency has, and how it, the placement of subs and the placement of listeners all have to add up. Otherwise, you're just guessing!
“You match a DSP filter's amplitude, Q and frequency to the frequency centered in a peak or null of a mode.”
Right, most of us know how to use REW.
@Mitchibo
Get your subs corner positioned if you can. Then use MiniDSP to get a flat response. It looks like you have a broad bump peaking at around
50hz.
Try a -3dB Q = 3 peak filter.
Once you get it flat, run Audyssey and let me know what you think.
What measurement were you looking at for that DSP filter? Post #41 has 3 measurements, all of them show the center of the hump is at 45 Hz, and bandwidth is a lot more than 3 hz, more like 11, possibly more. But as I asked the OP, I don't think their measurements are 1/24 octave, so that resonance could be even larger. I'll keep restating that the endeavor to control room modes is a very exacting science, you can't guess!
Figuring out your room modes is fairly easy, but it’s tertiary information by itself. REW can even calculate them into a curve for you (YMMV). In any event it’s usually apparent when you do your first sweep. Finding proper location for your subs takes a lot of this out of the question in the first place. I’ll be honest, I think you’re on a massive
Dunning Kruger kick and are simply too quick to condescend to ideas if they don’t absolutely reflect your own.
As yepimonfire just demonstrated, REW does a pretty poor job of guessing. I do not understand the resistance of some people here to do some quick 'back of the envelope' calculations that enable you to understand which room boundaries are interfering, and how you need to configure/place the subwoofers to control the resonance at the LP. DSP is only a part of that solution.
Warrior, I can feel your enthusiasm and I respect your pursuit of audio knowledge, but jeez man. I used dsp to tailor a flat response in my room and It's not just pretty lines on a graph. I have very audible improvements and couldn't be happier with the results. I feel like you're crapping all over my results when you type stuff like that. My system has never sounded so good,
I'm sorry you feel like I am crapping on you. I am sorry if anyone feels like I am crapping on them. My aim is to be precise, but I don't mask an insult when I recommend an alternative. But when I keep reading from Floyd's decades of research that are confirmed by double blind tests, I feel my integrity is at risk if I remain silent when ineffective recommendations are made. Everyone has their own preferences, of course. But if people were convinced of their system's performance, why are measurements being shared with the hope of receiving suggestions? You started with Audyssey controls, and then discovered the potential of minidsp. So please don't think I am telling you you're incapable. But when I consistently focus on the clearly defined, verifiable, room induced issues, and even make simple calculations for predictions, hopefully you can see that as less 'crap' and more as constructive criticism, rooted in science.
Thank you for recognizing my pursuit of knowledge. I again apologize if anyone thinks I am being a, whatever negative connotation you prefer. But I will defend myself any time any one criticizes my suggestions, without even trying them.
