To start, I'm sure this topic has been discussed ad nauseum, and this is in no way an attempt to troll. I'm pretty new to this forum, and have to say in the short time I have been here I have learned and gained a PLETHORA of knowledge that I cannot thank everyone here enough for. This post is merely an attempt to continue that trend and to educate myself even further. The general consensus here is that it is bad juju to combine different cabinets that have different size speakers. I'm sure there is evidence that can both prove and disprove this, but the problem I have is when people say that it's due to PHASING issues. I am not an engineer nor do I have any kind of formal technical background, so I am just trying to understand this from a layman's standpoint. But I always thought phase had nothing to do with timing, and is something completely different. Phase would have to do with the way the cabinets were wired, and if one was wired opposite of the other you were using, THAT would cause phasing issues. Basically the same thing would happen if you hooked up one of your stereo speakers opposite of the other, then they are said to be out of phase. This I understand, but am sure there is an industry standard as to how the leads are connected to what terminals on the speaker in order to prevent cabinets from being out of phase with each other. The other issue I have is when others mention TIMING issues or differences when using cabs with different size speakers, because of the differences in speaker size, they will move at different speeds, thus resulting in an identical frequency from say a 10" speaker will reach a certain distance at a different time that that same frequency coming from a 15" speaker. This to me in theory sounds like it makes sense, but I am still having a hard time believing that it would make any discernable difference in the real world. And although there may be a SLIGHT difference in the timing or delivery of an identical frequency produced by two different size speakers, the wavelength of that frequency is going to be the same size, regardless of what size speaker produces that frequency. I mean, sure, EVENTUALLY if the signal was strong enough, and had the amplitude and power behind it to travel far enough, there MAY be a point eventually where those two identical frequencies produced by two different size speakers in the same rig MIGHT end up out of phase, but I really doubt that that could ever manifest itself in a real world situation, and cannot imagine it happening in a small venue, bar, club, etc. The reason I think this is hard to believe is because we are surrounded with devices that use different size speakers together in the real world and have never heard it being an issue, be it in a television, desktop speakers, pro-audio/powered monitors, etc. I'm not saying its all a bunch of b.s., because I 'get it' from an analytical perspective, but in real world application I really think it's reaching here, especially if your using cabs from the same company, the same design, that just have different size drivers in them. Am I way off here and missing something? And thanks to everyone who read this long winded post, and encourage your feedback and thoughts!